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linker script examples #1

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matu3ba opened this issue Jul 19, 2023 · 3 comments
Open

linker script examples #1

matu3ba opened this issue Jul 19, 2023 · 3 comments

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@matu3ba
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matu3ba commented Jul 19, 2023 •
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This is a placeholder to append linker script examples.
@matu3ba
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matu3ba commented Jul 19, 2023 

/*--------------------------------------------------------------------------
 * MPLAB XC Compiler -  PIC32MX564F128H linker script
 * Build date : Jul 22 2014
 * 
 * This software is developed by Microchip Technology Inc. and its
 * subsidiaries ("Microchip").
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 * 1.      Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 * 2.      Redistributions in binary form must reproduce the above 
 *         copyright notice, this list of conditions and the following 
 *         disclaimer in the documentation and/or other materials provided 
 *         with the distribution.
 * 3.      Microchip's name may not be used to endorse or promote products
 *         derived from this software without specific prior written 
 *         permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY MICROCHIP "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL MICROCHIP BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING BUT NOT LIMITED TO
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWSOEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 *-------------------------------------------------------------------------*/

/* Default linker script, for normal executables */

/*  IMPORTANT: PIC32MX MCUs use two files for the default linker script: 
 *    1) pic32mx/lib/ldscripts/elf32pic32.x (main linker script)
 *    2) pic32mx/lib/proc/32MX564F128H/procdefs.ld (variant-specific fragment)
 *
 *  This file is provided only as a convenience when adding a custom linker script
 *  to your application.
 */

OUTPUT_FORMAT("elf32-tradlittlemips")
OUTPUT_ARCH(pic32mx)
ENTRY(_reset)
/*
 * Provide for a minimum stack and heap size
 * - _min_stack_size - represents the minimum space that must be made
 *                     available for the stack.  Can be overridden from
 *                     the command line using the linker's --defsym option.
 * - _min_heap_size  - represents the minimum space that must be made
 *                     available for the heap.  Must be specified on
 *                     the command line using the linker's --defsym option.
 */
EXTERN (_min_stack_size _min_heap_size)
PROVIDE(_min_stack_size = 0x400) ;

/*************************************************************************
 * Processor-specific object file.  Contains SFR definitions.
 *************************************************************************/
INPUT("processor.o")

/*************************************************************************
 * Processor-specific peripheral libraries are optional
 *************************************************************************/
OPTIONAL("libmchp_peripheral.a")
OPTIONAL("libmchp_peripheral_32MX564F128H.a")

/*************************************************************************
 * For interrupt vector handling
 *************************************************************************/
PROVIDE(_vector_spacing = 0x00000001);
_ebase_address = 0x9D00A000;

/*************************************************************************
 * Memory Address Equates
 * _RESET_ADDR                    -- Reset Vector
 * _BEV_EXCPT_ADDR                -- Boot exception Vector
 * _DBG_EXCPT_ADDR                -- In-circuit Debugging Exception Vector
 * _DBG_CODE_ADDR                 -- In-circuit Debug Executive address
 * _DBG_CODE_SIZE                 -- In-circuit Debug Executive size
 * _GEN_EXCPT_ADDR                -- General Exception Vector
 * Slave
 *************************************************************************/
_RESET_ADDR                    = 0x9D009000;
_BEV_EXCPT_ADDR                = 0x9D009380;
_DBG_EXCPT_ADDR                = 0x9D009480;
_DBG_CODE_ADDR                 = 0xBFC02000;
_DBG_CODE_SIZE           	   = 0x00;
_GEN_EXCPT_ADDR                = _ebase_address + 0x180;

/*************************************************************************
 * Memory Regions
 *
 * Memory regions without attributes cannot be used for orphaned sections.
 * Only sections specifically assigned to these regions can be allocated
 * into these regions.
 *
 * The Debug exception vector is located at 0x9FC00480.
 *
 * The config_<address> sections are used to locate the config words at
 * their absolute addresses.
 *************************************************************************/
MEMORY
{
  kseg0_program_mem     (rx)  : ORIGIN = 0x9D00B000, LENGTH = (0x20000 - 0xC000)
  kseg0_boot_mem              : ORIGIN = 0x9D009490, LENGTH = 0x970
  exception_mem               : ORIGIN = 0x9D00A000, LENGTH = 0x1000
  kseg1_boot_mem              : ORIGIN = 0xBD009000, LENGTH = 0x490
  debug_exec_mem              : ORIGIN = 0xBFC02000, LENGTH = 0x00
  config3                     : ORIGIN = 0xBFC02FF0, LENGTH = 0x4
  config2                     : ORIGIN = 0xBFC02FF4, LENGTH = 0x4
  config1                     : ORIGIN = 0xBFC02FF8, LENGTH = 0x4
  config0                     : ORIGIN = 0xBFC02FFC, LENGTH = 0x4
  kseg1_data_mem       (w!x)  : ORIGIN = 0xA0000008, LENGTH = (0x8000 - 8)
  sfrs                        : ORIGIN = 0xBF800000, LENGTH = 0x100000
  configsfrs                  : ORIGIN = 0xBFC02FF0, LENGTH = 0x10
}

/*************************************************************************
 * Configuration-word sections. Map the config-pragma input sections to
 * absolute-address output sections.
 *************************************************************************/
SECTIONS
{
  .config_BFC02FF0 : {
    KEEP(*(.config_BFC02FF0))
  } > config3
  .config_BFC02FF4 : {
    KEEP(*(.config_BFC02FF4))
  } > config2
  .config_BFC02FF8 : {
    KEEP(*(.config_BFC02FF8))
  } > config1
  .config_BFC02FFC : {
    KEEP(*(.config_BFC02FFC))
  } > config0
}
SECTIONS
{
  /* Boot Sections */
  .reset _RESET_ADDR :
  {
    KEEP(*(.reset))
    /*KEEP(*(.reset.startup))  */
  } > kseg1_boot_mem
  .startup ORIGIN(kseg0_boot_mem) :
  {
    KEEP(*(.startup))
  } > kseg0_boot_mem /**/
  .bev_excpt _BEV_EXCPT_ADDR :
  {
    KEEP(*(.bev_handler))
  } > kseg1_boot_mem
  /* Debug exception vector */
  .dbg_excpt _DBG_EXCPT_ADDR (NOLOAD) :
  {
    . += (DEFINED (_DEBUGGER) ? 0x8 : 0x0);
  } > kseg1_boot_mem
  /* Space reserved for the debug executive */
  .dbg_code _DBG_CODE_ADDR (NOLOAD) :
  {
    . += (DEFINED (_DEBUGGER) ? _DBG_CODE_SIZE : 0x0);
  } > debug_exec_mem

  .app_excpt _GEN_EXCPT_ADDR :
  {
    KEEP(*(.gen_handler))
  } > exception_mem

  .vector_0 _ebase_address + 0x200 + ((_vector_spacing << 5) * 0) :
  {
     KEEP(*(.vector_0))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_0) <= (_vector_spacing << 5), "function at exception vector 0 too large")
  .vector_1 _ebase_address + 0x200 + ((_vector_spacing << 5) * 1) :
  {
     KEEP(*(.vector_1))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_1) <= (_vector_spacing << 5), "function at exception vector 1 too large")
  .vector_2 _ebase_address + 0x200 + ((_vector_spacing << 5) * 2) :
  {
     KEEP(*(.vector_2))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_2) <= (_vector_spacing << 5), "function at exception vector 2 too large")
  .vector_3 _ebase_address + 0x200 + ((_vector_spacing << 5) * 3) :
  {
     KEEP(*(.vector_3))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_3) <= (_vector_spacing << 5), "function at exception vector 3 too large")
  .vector_4 _ebase_address + 0x200 + ((_vector_spacing << 5) * 4) :
  {
     KEEP(*(.vector_4))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_4) <= (_vector_spacing << 5), "function at exception vector 4 too large")
  .vector_5 _ebase_address + 0x200 + ((_vector_spacing << 5) * 5) :
  {
     KEEP(*(.vector_5))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_5) <= (_vector_spacing << 5), "function at exception vector 5 too large")
  .vector_6 _ebase_address + 0x200 + ((_vector_spacing << 5) * 6) :
  {
     KEEP(*(.vector_6))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_6) <= (_vector_spacing << 5), "function at exception vector 6 too large")
  .vector_7 _ebase_address + 0x200 + ((_vector_spacing << 5) * 7) :
  {
     KEEP(*(.vector_7))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_7) <= (_vector_spacing << 5), "function at exception vector 7 too large")
  .vector_8 _ebase_address + 0x200 + ((_vector_spacing << 5) * 8) :
  {
     KEEP(*(.vector_8))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_8) <= (_vector_spacing << 5), "function at exception vector 8 too large")
  .vector_9 _ebase_address + 0x200 + ((_vector_spacing << 5) * 9) :
  {
     KEEP(*(.vector_9))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_9) <= (_vector_spacing << 5), "function at exception vector 9 too large")
  .vector_10 _ebase_address + 0x200 + ((_vector_spacing << 5) * 10) :
  {
     KEEP(*(.vector_10))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_10) <= (_vector_spacing << 5), "function at exception vector 10 too large")
  .vector_11 _ebase_address + 0x200 + ((_vector_spacing << 5) * 11) :
  {
     KEEP(*(.vector_11))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_11) <= (_vector_spacing << 5), "function at exception vector 11 too large")
  .vector_12 _ebase_address + 0x200 + ((_vector_spacing << 5) * 12) :
  {
     KEEP(*(.vector_12))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_12) <= (_vector_spacing << 5), "function at exception vector 12 too large")
  .vector_13 _ebase_address + 0x200 + ((_vector_spacing << 5) * 13) :
  {
     KEEP(*(.vector_13))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_13) <= (_vector_spacing << 5), "function at exception vector 13 too large")
  .vector_14 _ebase_address + 0x200 + ((_vector_spacing << 5) * 14) :
  {
     KEEP(*(.vector_14))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_14) <= (_vector_spacing << 5), "function at exception vector 14 too large")
  .vector_15 _ebase_address + 0x200 + ((_vector_spacing << 5) * 15) :
  {
     KEEP(*(.vector_15))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_15) <= (_vector_spacing << 5), "function at exception vector 15 too large")
  .vector_16 _ebase_address + 0x200 + ((_vector_spacing << 5) * 16) :
  {
     KEEP(*(.vector_16))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_16) <= (_vector_spacing << 5), "function at exception vector 16 too large")
  .vector_17 _ebase_address + 0x200 + ((_vector_spacing << 5) * 17) :
  {
     KEEP(*(.vector_17))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_17) <= (_vector_spacing << 5), "function at exception vector 17 too large")
  .vector_18 _ebase_address + 0x200 + ((_vector_spacing << 5) * 18) :
  {
     KEEP(*(.vector_18))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_18) <= (_vector_spacing << 5), "function at exception vector 18 too large")
  .vector_19 _ebase_address + 0x200 + ((_vector_spacing << 5) * 19) :
  {
     KEEP(*(.vector_19))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_19) <= (_vector_spacing << 5), "function at exception vector 19 too large")
  .vector_20 _ebase_address + 0x200 + ((_vector_spacing << 5) * 20) :
  {
     KEEP(*(.vector_20))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_20) <= (_vector_spacing << 5), "function at exception vector 20 too large")
  .vector_21 _ebase_address + 0x200 + ((_vector_spacing << 5) * 21) :
  {
     KEEP(*(.vector_21))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_21) <= (_vector_spacing << 5), "function at exception vector 21 too large")
  .vector_22 _ebase_address + 0x200 + ((_vector_spacing << 5) * 22) :
  {
     KEEP(*(.vector_22))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_22) <= (_vector_spacing << 5), "function at exception vector 22 too large")
  .vector_23 _ebase_address + 0x200 + ((_vector_spacing << 5) * 23) :
  {
     KEEP(*(.vector_23))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_23) <= (_vector_spacing << 5), "function at exception vector 23 too large")
  .vector_24 _ebase_address + 0x200 + ((_vector_spacing << 5) * 24) :
  {
     KEEP(*(.vector_24))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_24) <= (_vector_spacing << 5), "function at exception vector 24 too large")
  .vector_25 _ebase_address + 0x200 + ((_vector_spacing << 5) * 25) :
  {
     KEEP(*(.vector_25))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_25) <= (_vector_spacing << 5), "function at exception vector 25 too large")
  .vector_26 _ebase_address + 0x200 + ((_vector_spacing << 5) * 26) :
  {
     KEEP(*(.vector_26))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_26) <= (_vector_spacing << 5), "function at exception vector 26 too large")
  .vector_27 _ebase_address + 0x200 + ((_vector_spacing << 5) * 27) :
  {
     KEEP(*(.vector_27))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_27) <= (_vector_spacing << 5), "function at exception vector 27 too large")
  .vector_28 _ebase_address + 0x200 + ((_vector_spacing << 5) * 28) :
  {
     KEEP(*(.vector_28))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_28) <= (_vector_spacing << 5), "function at exception vector 28 too large")
  .vector_29 _ebase_address + 0x200 + ((_vector_spacing << 5) * 29) :
  {
     KEEP(*(.vector_29))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_29) <= (_vector_spacing << 5), "function at exception vector 29 too large")
  .vector_30 _ebase_address + 0x200 + ((_vector_spacing << 5) * 30) :
  {
     KEEP(*(.vector_30))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_30) <= (_vector_spacing << 5), "function at exception vector 30 too large")
  .vector_31 _ebase_address + 0x200 + ((_vector_spacing << 5) * 31) :
  {
     KEEP(*(.vector_31))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_31) <= (_vector_spacing << 5), "function at exception vector 31 too large")
  .vector_32 _ebase_address + 0x200 + ((_vector_spacing << 5) * 32) :
  {
     KEEP(*(.vector_32))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_32) <= (_vector_spacing << 5), "function at exception vector 32 too large")
  .vector_33 _ebase_address + 0x200 + ((_vector_spacing << 5) * 33) :
  {
     KEEP(*(.vector_33))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_33) <= (_vector_spacing << 5), "function at exception vector 33 too large")
  .vector_34 _ebase_address + 0x200 + ((_vector_spacing << 5) * 34) :
  {
     KEEP(*(.vector_34))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_34) <= (_vector_spacing << 5), "function at exception vector 34 too large")
  .vector_35 _ebase_address + 0x200 + ((_vector_spacing << 5) * 35) :
  {
     KEEP(*(.vector_35))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_35) <= (_vector_spacing << 5), "function at exception vector 35 too large")
  .vector_36 _ebase_address + 0x200 + ((_vector_spacing << 5) * 36) :
  {
     KEEP(*(.vector_36))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_36) <= (_vector_spacing << 5), "function at exception vector 36 too large")
  .vector_37 _ebase_address + 0x200 + ((_vector_spacing << 5) * 37) :
  {
     KEEP(*(.vector_37))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_37) <= (_vector_spacing << 5), "function at exception vector 37 too large")
  .vector_38 _ebase_address + 0x200 + ((_vector_spacing << 5) * 38) :
  {
     KEEP(*(.vector_38))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_38) <= (_vector_spacing << 5), "function at exception vector 38 too large")
  .vector_39 _ebase_address + 0x200 + ((_vector_spacing << 5) * 39) :
  {
     KEEP(*(.vector_39))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_39) <= (_vector_spacing << 5), "function at exception vector 39 too large")
  .vector_40 _ebase_address + 0x200 + ((_vector_spacing << 5) * 40) :
  {
     KEEP(*(.vector_40))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_40) <= (_vector_spacing << 5), "function at exception vector 40 too large")
  .vector_41 _ebase_address + 0x200 + ((_vector_spacing << 5) * 41) :
  {
     KEEP(*(.vector_41))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_41) <= (_vector_spacing << 5), "function at exception vector 41 too large")
  .vector_42 _ebase_address + 0x200 + ((_vector_spacing << 5) * 42) :
  {
     KEEP(*(.vector_42))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_42) <= (_vector_spacing << 5), "function at exception vector 42 too large")
  .vector_43 _ebase_address + 0x200 + ((_vector_spacing << 5) * 43) :
  {
     KEEP(*(.vector_43))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_43) <= (_vector_spacing << 5), "function at exception vector 43 too large")
  .vector_44 _ebase_address + 0x200 + ((_vector_spacing << 5) * 44) :
  {
     KEEP(*(.vector_44))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_44) <= (_vector_spacing << 5), "function at exception vector 44 too large")
  .vector_45 _ebase_address + 0x200 + ((_vector_spacing << 5) * 45) :
  {
     KEEP(*(.vector_45))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_45) <= (_vector_spacing << 5), "function at exception vector 45 too large")
  .vector_46 _ebase_address + 0x200 + ((_vector_spacing << 5) * 46) :
  {
     KEEP(*(.vector_46))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_46) <= (_vector_spacing << 5), "function at exception vector 46 too large")
  .vector_47 _ebase_address + 0x200 + ((_vector_spacing << 5) * 47) :
  {
     KEEP(*(.vector_47))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_47) <= (_vector_spacing << 5), "function at exception vector 47 too large")
  .vector_48 _ebase_address + 0x200 + ((_vector_spacing << 5) * 48) :
  {
     KEEP(*(.vector_48))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_48) <= (_vector_spacing << 5), "function at exception vector 48 too large")
  .vector_49 _ebase_address + 0x200 + ((_vector_spacing << 5) * 49) :
  {
     KEEP(*(.vector_49))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_49) <= (_vector_spacing << 5), "function at exception vector 49 too large")
  .vector_50 _ebase_address + 0x200 + ((_vector_spacing << 5) * 50) :
  {
     KEEP(*(.vector_50))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_50) <= (_vector_spacing << 5), "function at exception vector 50 too large")
  .vector_51 _ebase_address + 0x200 + ((_vector_spacing << 5) * 51) :
  {
     KEEP(*(.vector_51))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_51) <= (_vector_spacing << 5), "function at exception vector 51 too large")
  .vector_52 _ebase_address + 0x200 + ((_vector_spacing << 5) * 52) :
  {
     KEEP(*(.vector_52))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_52) <= (_vector_spacing << 5), "function at exception vector 52 too large")
  .vector_53 _ebase_address + 0x200 + ((_vector_spacing << 5) * 53) :
  {
     KEEP(*(.vector_53))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_53) <= (_vector_spacing << 5), "function at exception vector 53 too large")
  .vector_54 _ebase_address + 0x200 + ((_vector_spacing << 5) * 54) :
  {
     KEEP(*(.vector_54))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_54) <= (_vector_spacing << 5), "function at exception vector 54 too large")
  .vector_55 _ebase_address + 0x200 + ((_vector_spacing << 5) * 55) :
  {
     KEEP(*(.vector_55))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_55) <= (_vector_spacing << 5), "function at exception vector 55 too large")
  .vector_56 _ebase_address + 0x200 + ((_vector_spacing << 5) * 56) :
  {
     KEEP(*(.vector_56))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_56) <= (_vector_spacing << 5), "function at exception vector 56 too large")
  .vector_57 _ebase_address + 0x200 + ((_vector_spacing << 5) * 57) :
  {
     KEEP(*(.vector_57))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_57) <= (_vector_spacing << 5), "function at exception vector 57 too large")
  .vector_58 _ebase_address + 0x200 + ((_vector_spacing << 5) * 58) :
  {
     KEEP(*(.vector_58))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_58) <= (_vector_spacing << 5), "function at exception vector 58 too large")
  .vector_59 _ebase_address + 0x200 + ((_vector_spacing << 5) * 59) :
  {
     KEEP(*(.vector_59))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_59) <= (_vector_spacing << 5), "function at exception vector 59 too large")
  .vector_60 _ebase_address + 0x200 + ((_vector_spacing << 5) * 60) :
  {
     KEEP(*(.vector_60))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_60) <= (_vector_spacing << 5), "function at exception vector 60 too large")
  .vector_61 _ebase_address + 0x200 + ((_vector_spacing << 5) * 61) :
  {
     KEEP(*(.vector_61))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_61) <= (_vector_spacing << 5), "function at exception vector 61 too large")
  .vector_62 _ebase_address + 0x200 + ((_vector_spacing << 5) * 62) :
  {
     KEEP(*(.vector_62))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_62) <= (_vector_spacing << 5), "function at exception vector 62 too large")
  .vector_63 _ebase_address + 0x200 + ((_vector_spacing << 5) * 63) :
  {
     KEEP(*(.vector_63))
  } > exception_mem
  ASSERT (_vector_spacing == 0 || SIZEOF(.vector_63) <= (_vector_spacing << 5), "function at exception vector 63 too large")

  /*  The startup code is in the .reset.startup section.
   *  Keep this here for backwards compatibility with older
   *  C32 v1.xx releases.
   */
  .startup ORIGIN(kseg0_boot_mem) :
  {
    KEEP(*(.startup))
  } > kseg0_boot_mem

  /* Code Sections - Note that input sections *(.text) and *(.text.*)
   * are not mapped here. The best-fit allocator locates them,
   * so that .text may flow around absolute sections as needed.
   */
  .text :
  {
    *(.stub .gnu.linkonce.t.*)
    KEEP (*(.text.*personality*))
    *(.mips16.fn.*)
    *(.mips16.call.*)
    *(.gnu.warning)
    . = ALIGN(4) ;
  } >kseg0_program_mem
  /* Global-namespace object initialization */
  .init   :
  {
    KEEP (*crti.o(.init))
    KEEP (*crtbegin.o(.init))
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o *crtn.o ).init))
    KEEP (*crtend.o(.init))
    KEEP (*crtn.o(.init))
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .fini   :
  {
    KEEP (*(.fini))
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .preinit_array   :
  {
    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array))
    PROVIDE_HIDDEN (__preinit_array_end = .);
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .init_array   :
  {
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT(.init_array.*)))
    KEEP (*(.init_array))
    PROVIDE_HIDDEN (__init_array_end = .);
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .fini_array   :
  {
    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT(.fini_array.*)))
    KEEP (*(.fini_array))
    PROVIDE_HIDDEN (__fini_array_end = .);
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .ctors   :
  {
    /* XC32 uses crtbegin.o to find the start of
       the constructors, so we make sure it is
       first.  Because this is a wildcard, it
       doesn't matter if the user does not
       actually link against crtbegin.o; the
       linker won't look for a file to match a
       wildcard.  The wildcard also means that it
       doesn't matter which directory crtbegin.o
       is in.  */
    KEEP (*crtbegin.o(.ctors))
    KEEP (*crtbegin?.o(.ctors))
    /* We don't want to include the .ctor section from
       the crtend.o file until after the sorted ctors.
       The .ctor section from the crtend file contains the
       end of ctors marker and it must be last */
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
    KEEP (*(SORT(.ctors.*)))
    KEEP (*(.ctors))
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .dtors   :
  {
    KEEP (*crtbegin.o(.dtors))
    KEEP (*crtbegin?.o(.dtors))
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
    KEEP (*(SORT(.dtors.*)))
    KEEP (*(.dtors))
    . = ALIGN(4) ;
  } >kseg0_program_mem
  /* Read-only sections */
  .rodata   :
  {
    *( .gnu.linkonce.r.*)
    *(.rodata1)
    . = ALIGN(4) ;
  } >kseg0_program_mem
  /*
   * Small initialized constant global and static data can be placed in the
   * .sdata2 section.  This is different from .sdata, which contains small
   * initialized non-constant global and static data.
   */
  .sdata2 ALIGN(4) :
  {
    *(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
    . = ALIGN(4) ;
  } >kseg0_program_mem
  /*
   * Uninitialized constant global and static data (i.e., variables which will
   * always be zero).  Again, this is different from .sbss, which contains
   * small non-initialized, non-constant global and static data.
   */
  .sbss2 ALIGN(4) :
  {
    *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
    . = ALIGN(4) ;
  } >kseg0_program_mem
  .eh_frame_hdr   :
  {
    *(.eh_frame_hdr)
  } >kseg0_program_mem
    . = ALIGN(4) ;
  .eh_frame   : ONLY_IF_RO
  {
    KEEP (*(.eh_frame))
  } >kseg0_program_mem
    . = ALIGN(4) ;
  .gcc_except_table   : ONLY_IF_RO
  {
    *(.gcc_except_table .gcc_except_table.*)
  } >kseg0_program_mem
    . = ALIGN(4) ;
  .dbg_data (NOLOAD) :
  {
    . += (DEFINED (_DEBUGGER) ? 0x200 : 0x0);
  } >kseg1_data_mem
  .jcr   :
  {
    KEEP (*(.jcr))
    . = ALIGN(4) ;
  } >kseg1_data_mem
  .eh_frame    : ONLY_IF_RW
  {
    KEEP (*(.eh_frame))
  } >kseg1_data_mem
    . = ALIGN(4) ;
  .gcc_except_table    : ONLY_IF_RW
  {
    *(.gcc_except_table .gcc_except_table.*)
  } >kseg1_data_mem
    . = ALIGN(4) ;
  /* Persistent data - Use the new C 'persistent' attribute instead. */
  .persist   :
  {
    _persist_begin = .;
    *(.persist .persist.*)
    *(.pbss .pbss.*)
    . = ALIGN(4) ;
    _persist_end = .;
  } >kseg1_data_mem
  /*
   *  Note that input sections named .data* are not mapped here.
   *  The best-fit allocator locates them, so that they may flow
   *  around absolute sections as needed.
   */
  .data   :
  {
    *( .gnu.linkonce.d.*)
    SORT(CONSTRUCTORS)
    *(.data1)
    . = ALIGN(4) ;
  } >kseg1_data_mem
  . = .;
  _gp = ALIGN(16) + 0x7ff0;
  .got ALIGN(4) :
  {
    *(.got.plt) *(.got)
    . = ALIGN(4) ;
  } >kseg1_data_mem /* AT>kseg0_program_mem */
  /*
   * Note that 'small' data sections are still mapped in the linker
   * script. This ensures that they are grouped together for
   * gp-relative addressing. Absolute sections are allocated after
   * the 'small' data sections so small data cannot flow around them.
   */
  /*
   * We want the small data sections together, so single-instruction offsets
   * can access them all, and initialized data all before uninitialized, so
   * we can shorten the on-disk segment size.
   */
  .sdata ALIGN(4) :
  {
    _sdata_begin = . ;
    *(.sdata .sdata.* .gnu.linkonce.s.*)
    . = ALIGN(4) ;
    _sdata_end = . ;
  } >kseg1_data_mem
  .lit8           :
  {
    *(.lit8)
  } >kseg1_data_mem
  .lit4           :
  {
    *(.lit4)
  } >kseg1_data_mem
  . = ALIGN (4) ;
  _data_end = . ;
  _bss_begin = . ;
  .sbss ALIGN(4) :
  {
    _sbss_begin = . ;
    *(.dynsbss)
    *(.sbss .sbss.* .gnu.linkonce.sb.*)
    *(.scommon)
    _sbss_end = . ;
    . = ALIGN(4) ;
  } >kseg1_data_mem
  /*
   *  Align here to ensure that the .bss section occupies space up to
   *  _end.  Align after .bss to ensure correct alignment even if the
   *  .bss section disappears because there are no input sections.
   *
   *  Note that input sections named .bss* are no longer mapped here.
   *  The best-fit allocator locates them, so that they may flow
   *  around absolute sections as needed.
   *
   */
  .bss     :
  {
    *(.dynbss)
    *(COMMON)
   /* Align here to ensure that the .bss section occupies space up to
      _end.  Align after .bss to ensure correct alignment even if the
      .bss section disappears because there are no input sections. */
   . = ALIGN(. != 0 ? 4 : 1);
  } >kseg1_data_mem
  . = ALIGN(4) ;
  _end = . ;
  _bss_end = . ;
  /*
   *  The heap and stack are best-fit allocated by the linker after other
   *  data and bss sections have been allocated.
   */
  /*
   * RAM functions go at the end of our stack and heap allocation.
   * Alignment of 2K required by the boundary register (BMXDKPBA).
   *
   * RAM functions are now allocated by the linker. The linker generates
   * _ramfunc_begin and _bmxdkpba_address symbols depending on the
   * location of RAM functions.
   */
  _bmxdudba_address = LENGTH(kseg1_data_mem) ;
  _bmxdupba_address = LENGTH(kseg1_data_mem) ;
    /* The .pdr section belongs in the absolute section */
    /DISCARD/ : { *(.pdr) }
  .gptab.sdata : { *(.gptab.data) *(.gptab.sdata) }
  .gptab.sbss : { *(.gptab.bss) *(.gptab.sbss) }
  .mdebug.abi32 : { KEEP(*(.mdebug.abi32)) }
  .mdebug.abiN32 : { KEEP(*(.mdebug.abiN32)) }
  .mdebug.abi64 : { KEEP(*(.mdebug.abi64)) }
  .mdebug.abiO64 : { KEEP(*(.mdebug.abiO64)) }
  .mdebug.eabi32 : { KEEP(*(.mdebug.eabi32)) }
  .mdebug.eabi64 : { KEEP(*(.mdebug.eabi64)) }
  .gcc_compiled_long32 : { KEEP(*(.gcc_compiled_long32)) }
  .gcc_compiled_long64 : { KEEP(*(.gcc_compiled_long64)) }
  /* Stabs debugging sections.  */
  .stab          0 : { *(.stab) }
  .stabstr       0 : { *(.stabstr) }
  .stab.excl     0 : { *(.stab.excl) }
  .stab.exclstr  0 : { *(.stab.exclstr) }
  .stab.index    0 : { *(.stab.index) }
  .stab.indexstr 0 : { *(.stab.indexstr) }
  .comment       0 : { *(.comment) }
  /* DWARF debug sections used by MPLAB X for source-level debugging. 
     Symbols in the DWARF debugging sections are relative to the beginning
     of the section so we begin them at 0.  */
  /* DWARF 1 */
  .debug          0 : { *(.debug) }
  .line           0 : { *(.line) }
  /* GNU DWARF 1 extensions */
  .debug_srcinfo  0 : { *(.debug_srcinfo) }
  .debug_sfnames  0 : { *(.debug_sfnames) }
  /* DWARF 1.1 and DWARF 2 */
  .debug_aranges  0 : { *(.debug_aranges) }
  .debug_pubnames 0 : { *(.debug_pubnames) }
  /* DWARF 2 */
  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
  .debug_abbrev   0 : { *(.debug_abbrev) }
  .debug_line     0 : { *(.debug_line) }
  .debug_frame    0 : { *(.debug_frame) }
  .debug_str      0 : { *(.debug_str) }
  .debug_loc      0 : { *(.debug_loc) }
  .debug_macinfo  0 : { *(.debug_macinfo) }
  /* SGI/MIPS DWARF 2 extensions */
  .debug_weaknames 0 : { *(.debug_weaknames) }
  .debug_funcnames 0 : { *(.debug_funcnames) }
  .debug_typenames 0 : { *(.debug_typenames) }
  .debug_varnames  0 : { *(.debug_varnames) }
  .debug_pubtypes 0 : { *(.debug_pubtypes) }
  .debug_ranges   0 : { *(.debug_ranges) }
  /DISCARD/ : { *(.rel.dyn) }
  .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
  /DISCARD/ : { *(.note.GNU-stack) }
  /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) *(.discard) }
}

SECTIONS
{
  /DISCARD/ : { *(._debug_exception) }
}

@matu3ba
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Author

matu3ba commented Jul 19, 2023 •
edited
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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * ld script for the x86 kernel
 *
 * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
 *
 * Modernisation, unification and other changes and fixes:
 *   Copyright (C) 2007-2009  Sam Ravnborg <sam@ravnborg.org>
 *
 *
 * Don't define absolute symbols until and unless you know that symbol
 * value is should remain constant even if kernel image is relocated
 * at run time. Absolute symbols are not relocated. If symbol value should
 * change if kernel is relocated, make the symbol section relative and
 * put it inside the section definition.
 */

#ifdef CONFIG_X86_32
#define LOAD_OFFSET __PAGE_OFFSET
#else
#define LOAD_OFFSET __START_KERNEL_map
#endif

#define RUNTIME_DISCARD_EXIT
#define EMITS_PT_NOTE
#define RO_EXCEPTION_TABLE_ALIGN	16

#include <asm-generic/vmlinux.lds.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/page_types.h>
#include <asm/orc_lookup.h>
#include <asm/cache.h>
#include <asm/boot.h>

#undef i386     /* in case the preprocessor is a 32bit one */

OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT)

#ifdef CONFIG_X86_32
OUTPUT_ARCH(i386)
ENTRY(phys_startup_32)
#else
OUTPUT_ARCH(i386:x86-64)
ENTRY(phys_startup_64)
#endif

jiffies = jiffies_64;

#if defined(CONFIG_X86_64)
/*
 * On 64-bit, align RODATA to 2MB so we retain large page mappings for
 * boundaries spanning kernel text, rodata and data sections.
 *
 * However, kernel identity mappings will have different RWX permissions
 * to the pages mapping to text and to the pages padding (which are freed) the
 * text section. Hence kernel identity mappings will be broken to smaller
 * pages. For 64-bit, kernel text and kernel identity mappings are different,
 * so we can enable protection checks as well as retain 2MB large page
 * mappings for kernel text.
 */
#define X86_ALIGN_RODATA_BEGIN	. = ALIGN(HPAGE_SIZE);

#define X86_ALIGN_RODATA_END					\
		. = ALIGN(HPAGE_SIZE);				\
		__end_rodata_hpage_align = .;			\
		__end_rodata_aligned = .;

#define ALIGN_ENTRY_TEXT_BEGIN	. = ALIGN(PMD_SIZE);
#define ALIGN_ENTRY_TEXT_END	. = ALIGN(PMD_SIZE);

/*
 * This section contains data which will be mapped as decrypted. Memory
 * encryption operates on a page basis. Make this section PMD-aligned
 * to avoid splitting the pages while mapping the section early.
 *
 * Note: We use a separate section so that only this section gets
 * decrypted to avoid exposing more than we wish.
 */
#define BSS_DECRYPTED						\
	. = ALIGN(PMD_SIZE);					\
	__start_bss_decrypted = .;				\
	*(.bss..decrypted);					\
	. = ALIGN(PAGE_SIZE);					\
	__start_bss_decrypted_unused = .;			\
	. = ALIGN(PMD_SIZE);					\
	__end_bss_decrypted = .;				\

#else

#define X86_ALIGN_RODATA_BEGIN
#define X86_ALIGN_RODATA_END					\
		. = ALIGN(PAGE_SIZE);				\
		__end_rodata_aligned = .;

#define ALIGN_ENTRY_TEXT_BEGIN
#define ALIGN_ENTRY_TEXT_END
#define BSS_DECRYPTED

#endif

PHDRS {
	text PT_LOAD FLAGS(5);          /* R_E */
	data PT_LOAD FLAGS(6);          /* RW_ */
#ifdef CONFIG_X86_64
#ifdef CONFIG_SMP
	percpu PT_LOAD FLAGS(6);        /* RW_ */
#endif
	init PT_LOAD FLAGS(7);          /* RWE */
#endif
	note PT_NOTE FLAGS(0);          /* ___ */
}

SECTIONS
{
#ifdef CONFIG_X86_32
	. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
	phys_startup_32 = ABSOLUTE(startup_32 - LOAD_OFFSET);
#else
	. = __START_KERNEL;
	phys_startup_64 = ABSOLUTE(startup_64 - LOAD_OFFSET);
#endif

	/* Text and read-only data */
	.text :  AT(ADDR(.text) - LOAD_OFFSET) {
		_text = .;
		_stext = .;
		/* bootstrapping code */
		HEAD_TEXT
		TEXT_TEXT
		SCHED_TEXT
		LOCK_TEXT
		KPROBES_TEXT
		SOFTIRQENTRY_TEXT
#ifdef CONFIG_RETPOLINE
		__indirect_thunk_start = .;
		*(.text.__x86.*)
		__indirect_thunk_end = .;
#endif
		STATIC_CALL_TEXT

		ALIGN_ENTRY_TEXT_BEGIN
		ENTRY_TEXT
		ALIGN_ENTRY_TEXT_END
		*(.gnu.warning)

	} :text =0xcccc

	/* End of text section, which should occupy whole number of pages */
	_etext = .;
	. = ALIGN(PAGE_SIZE);

	X86_ALIGN_RODATA_BEGIN
	RO_DATA(PAGE_SIZE)
	X86_ALIGN_RODATA_END

	/* Data */
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
		/* Start of data section */
		_sdata = .;

		/* init_task */
		INIT_TASK_DATA(THREAD_SIZE)

#ifdef CONFIG_X86_32
		/* 32 bit has nosave before _edata */
		NOSAVE_DATA
#endif

		PAGE_ALIGNED_DATA(PAGE_SIZE)

		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)

		DATA_DATA
		CONSTRUCTORS

		/* rarely changed data like cpu maps */
		READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)

		/* End of data section */
		_edata = .;
	} :data

	BUG_TABLE

	ORC_UNWIND_TABLE

	. = ALIGN(PAGE_SIZE);
	__vvar_page = .;

	.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
		/* work around gold bug 13023 */
		__vvar_beginning_hack = .;

		/* Place all vvars at the offsets in asm/vvar.h. */
#define EMIT_VVAR(name, offset)				\
		. = __vvar_beginning_hack + offset;	\
		*(.vvar_ ## name)
#include <asm/vvar.h>
#undef EMIT_VVAR

		/*
		 * Pad the rest of the page with zeros.  Otherwise the loader
		 * can leave garbage here.
		 */
		. = __vvar_beginning_hack + PAGE_SIZE;
	} :data

	. = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);

	/* Init code and data - will be freed after init */
	. = ALIGN(PAGE_SIZE);
	.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
		__init_begin = .; /* paired with __init_end */
	}

#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
	/*
	 * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the
	 * output PHDR, so the next output section - .init.text - should
	 * start another segment - init.
	 */
	PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)
	ASSERT(SIZEOF(.data..percpu) < CONFIG_PHYSICAL_START,
	       "per-CPU data too large - increase CONFIG_PHYSICAL_START")
#endif

	INIT_TEXT_SECTION(PAGE_SIZE)
#ifdef CONFIG_X86_64
	:init
#endif

	/*
	 * Section for code used exclusively before alternatives are run. All
	 * references to such code must be patched out by alternatives, normally
	 * by using X86_FEATURE_ALWAYS CPU feature bit.
	 *
	 * See static_cpu_has() for an example.
	 */
	.altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) {
		*(.altinstr_aux)
	}

	INIT_DATA_SECTION(16)

	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
		__x86_cpu_dev_start = .;
		*(.x86_cpu_dev.init)
		__x86_cpu_dev_end = .;
	}

#ifdef CONFIG_X86_INTEL_MID
	.x86_intel_mid_dev.init : AT(ADDR(.x86_intel_mid_dev.init) - \
								LOAD_OFFSET) {
		__x86_intel_mid_dev_start = .;
		*(.x86_intel_mid_dev.init)
		__x86_intel_mid_dev_end = .;
	}
#endif

	/*
	 * start address and size of operations which during runtime
	 * can be patched with virtualization friendly instructions or
	 * baremetal native ones. Think page table operations.
	 * Details in paravirt_types.h
	 */
	. = ALIGN(8);
	.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
		__parainstructions = .;
		*(.parainstructions)
		__parainstructions_end = .;
	}

#ifdef CONFIG_RETPOLINE
	/*
	 * List of instructions that call/jmp/jcc to retpoline thunks
	 * __x86_indirect_thunk_*(). These instructions can be patched along
	 * with alternatives, after which the section can be freed.
	 */
	. = ALIGN(8);
	.retpoline_sites : AT(ADDR(.retpoline_sites) - LOAD_OFFSET) {
		__retpoline_sites = .;
		*(.retpoline_sites)
		__retpoline_sites_end = .;
	}

	. = ALIGN(8);
	.return_sites : AT(ADDR(.return_sites) - LOAD_OFFSET) {
		__return_sites = .;
		*(.return_sites)
		__return_sites_end = .;
	}

	. = ALIGN(8);
	.call_sites : AT(ADDR(.call_sites) - LOAD_OFFSET) {
		__call_sites = .;
		*(.call_sites)
		__call_sites_end = .;
	}
#endif

#ifdef CONFIG_X86_KERNEL_IBT
	. = ALIGN(8);
	.ibt_endbr_seal : AT(ADDR(.ibt_endbr_seal) - LOAD_OFFSET) {
		__ibt_endbr_seal = .;
		*(.ibt_endbr_seal)
		__ibt_endbr_seal_end = .;
	}
#endif

#ifdef CONFIG_FINEIBT
	. = ALIGN(8);
	.cfi_sites : AT(ADDR(.cfi_sites) - LOAD_OFFSET) {
		__cfi_sites = .;
		*(.cfi_sites)
		__cfi_sites_end = .;
	}
#endif

	/*
	 * struct alt_inst entries. From the header (alternative.h):
	 * "Alternative instructions for different CPU types or capabilities"
	 * Think locking instructions on spinlocks.
	 */
	. = ALIGN(8);
	.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
		__alt_instructions = .;
		*(.altinstructions)
		__alt_instructions_end = .;
	}

	/*
	 * And here are the replacement instructions. The linker sticks
	 * them as binary blobs. The .altinstructions has enough data to
	 * get the address and the length of them to patch the kernel safely.
	 */
	.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
		*(.altinstr_replacement)
	}

	. = ALIGN(8);
	.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
		__apicdrivers = .;
		*(.apicdrivers);
		__apicdrivers_end = .;
	}

	. = ALIGN(8);
	/*
	 * .exit.text is discarded at runtime, not link time, to deal with
	 *  references from .altinstructions
	 */
	.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
		EXIT_TEXT
	}

	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
		EXIT_DATA
	}

#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
	PERCPU_SECTION(INTERNODE_CACHE_BYTES)
#endif

	. = ALIGN(PAGE_SIZE);

	/* freed after init ends here */
	.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
		__init_end = .;
	}

	/*
	 * smp_locks might be freed after init
	 * start/end must be page aligned
	 */
	. = ALIGN(PAGE_SIZE);
	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
		__smp_locks = .;
		*(.smp_locks)
		. = ALIGN(PAGE_SIZE);
		__smp_locks_end = .;
	}

#ifdef CONFIG_X86_64
	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
		NOSAVE_DATA
	}
#endif

	/* BSS */
	. = ALIGN(PAGE_SIZE);
	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
		__bss_start = .;
		*(.bss..page_aligned)
		. = ALIGN(PAGE_SIZE);
		*(BSS_MAIN)
		BSS_DECRYPTED
		. = ALIGN(PAGE_SIZE);
		__bss_stop = .;
	}

	/*
	 * The memory occupied from _text to here, __end_of_kernel_reserve, is
	 * automatically reserved in setup_arch(). Anything after here must be
	 * explicitly reserved using memblock_reserve() or it will be discarded
	 * and treated as available memory.
	 */
	__end_of_kernel_reserve = .;

	. = ALIGN(PAGE_SIZE);
	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
		__brk_base = .;
		. += 64 * 1024;		/* 64k alignment slop space */
		*(.bss..brk)		/* areas brk users have reserved */
		__brk_limit = .;
	}

	. = ALIGN(PAGE_SIZE);		/* keep VO_INIT_SIZE page aligned */
	_end = .;

#ifdef CONFIG_AMD_MEM_ENCRYPT
	/*
	 * Early scratch/workarea section: Lives outside of the kernel proper
	 * (_text - _end).
	 *
	 * Resides after _end because even though the .brk section is after
	 * __end_of_kernel_reserve, the .brk section is later reserved as a
	 * part of the kernel. Since it is located after __end_of_kernel_reserve
	 * it will be discarded and become part of the available memory. As
	 * such, it can only be used by very early boot code and must not be
	 * needed afterwards.
	 *
	 * Currently used by SME for performing in-place encryption of the
	 * kernel during boot. Resides on a 2MB boundary to simplify the
	 * pagetable setup used for SME in-place encryption.
	 */
	. = ALIGN(HPAGE_SIZE);
	.init.scratch : AT(ADDR(.init.scratch) - LOAD_OFFSET) {
		__init_scratch_begin = .;
		*(.init.scratch)
		. = ALIGN(HPAGE_SIZE);
		__init_scratch_end = .;
	}
#endif

	STABS_DEBUG
	DWARF_DEBUG
	ELF_DETAILS

	DISCARDS

	/*
	 * Make sure that the .got.plt is either completely empty or it
	 * contains only the lazy dispatch entries.
	 */
	.got.plt (INFO) : { *(.got.plt) }
	ASSERT(SIZEOF(.got.plt) == 0 ||
#ifdef CONFIG_X86_64
	       SIZEOF(.got.plt) == 0x18,
#else
	       SIZEOF(.got.plt) == 0xc,
#endif
	       "Unexpected GOT/PLT entries detected!")

	/*
	 * Sections that should stay zero sized, which is safer to
	 * explicitly check instead of blindly discarding.
	 */
	.got : {
		*(.got) *(.igot.*)
	}
	ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!")

	.plt : {
		*(.plt) *(.plt.*) *(.iplt)
	}
	ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")

	.rel.dyn : {
		*(.rel.*) *(.rel_*)
	}
	ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!")

	.rela.dyn : {
		*(.rela.*) *(.rela_*)
	}
	ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
}

/*
 * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
 */
. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
	   "kernel image bigger than KERNEL_IMAGE_SIZE");

#ifdef CONFIG_X86_64
/*
 * Per-cpu symbols which need to be offset from __per_cpu_load
 * for the boot processor.
 */
#define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x) + __per_cpu_load
INIT_PER_CPU(gdt_page);
INIT_PER_CPU(fixed_percpu_data);
INIT_PER_CPU(irq_stack_backing_store);

#ifdef CONFIG_SMP
. = ASSERT((fixed_percpu_data == 0),
           "fixed_percpu_data is not at start of per-cpu area");
#endif

#ifdef CONFIG_RETHUNK
. = ASSERT((__x86_return_thunk & 0x3f) == 0, "__x86_return_thunk not cacheline-aligned");
#endif

#endif /* CONFIG_X86_64 */

@matu3ba
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matu3ba commented Jul 19, 2023 

/* Licensed under the Apache License, Version 2.0 or the MIT License. */
/* SPDX-License-Identifier: Apache-2.0 OR MIT                         */
/* Copyright Tock Contributors 2023.                                  */

/*
 * This is the generic linker script for Tock. For most developers, it should
 * be sufficient to define {ROM/PROG/RAM}_{ORIGIN/LENGTH} (6 variables, the
 * start and length for each) and PAGE_SIZE (the size of a flash page).
 * If undefined, PAGE_SIZE uses the default value of 512 bytes.
 *
 * --------------------------------------------------------------------------
 *
 * If you wish to create your own linker script from scratch, you must define
 * the following symbols:
 *
 * `_etext`, `_srelocate`, `_erelocate`
 *    The `_etext` symbol marks the end of data stored in flash that should
 *    stay in flash. `_srelocate` and `_erelocate` mark the address range in
 *    SRAM that mutable program data is copied to.
 *
 *    Tock will copy `_erelocate` - `_srelocate` bytes of data from the
 *    `_etext` pointer to the `_srelocate` pointer.
 *
 * `_szero`, `_ezero`
 *
 *    The `_szero` and `_ezero` symbols define the range of the BSS, SRAM that
 *    Tock will zero on boot.
 *
 * `_sapps`, `_eapps`
 *
 *    The `_sapps` symbol marks the beginning of application memory in flash.
 *    The `_eapps` symbol marks the end of application memory in flash by
 *    pointing to next address after application flash.
 *
 * `_sappmem`, `_eappmem`
 *
 *    The `_sappmem` symbol marks the beginning of application memory in RAM.
 *    The `_eappmem` symbol marks the end of application memory in RAM by
 *    pointing to next address after application RAM.
 */

PAGE_SIZE = DEFINED(PAGE_SIZE) ? PAGE_SIZE : 512;

SECTIONS
{
   .stack (NOLOAD) :
    {
        /* Kernel stack.
         *
         * Tock places the kernel stack at the bottom of SRAM so that the
         * kernel will trigger memory fault if it exceeds its stack depth,
         * rather than silently overwriting valuable data.
         */
        . = ALIGN(8);
         _sstack = .;

         /* For GNU LD, we can just advance the location pointer (".") here to
          * reserve space for the stack. That, however, doesn't seem to work
          * for LLVM LLD. The resulting ELF has a stack section that shows the
          * correct size, but the next section (in our case .relocate) is not
          * moved down as well, instead it sits at the same address as .stack.
          * To work around this, we declare a dummy buffer and then insert it
          * here in the .stack section. This sets the stack size correctly and
          * places the .relocate section at the correct address. */
         KEEP(*(.stack_buffer))
         /*. = . + 0x1000;*/  /*This is the original method. */

         . = ALIGN(8);
         _estack = .;
    } > ram


    /* STATIC ELEMENTS FOR TOCK KERNEL */
    .text :
    {
        . = ALIGN(4);
        _textstart = .;         /* Symbol expected by some MS build toolchains */
        _stext = .;         /* First of standard s,e (start/end) pair */

        /* Place vector table at the beginning of ROM.
         *
         * The first 16 entries in the ARM vector table are defined by ARM and
         * are common among all ARM chips. The remaining entries are
         * chip-specific, which Tock defines in a separate .irqs section
         *
         * http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0553a/BABIFJFG.html
         */
        KEEP(*(.vectors .vectors.*))
        KEEP(*(.irqs))

        /* RISC-V
         * There is no vector table in RISCV, so .vectors and .irqs will be
         * empty. Instead, the _start function needs to be first in the binary
         * for it to correctly be executed. We also need to include the trap
         * handler assembly function.
         *
         * These are expected to just be empty on other platforms so they
         * shouldn't have any effect.
         */
        KEEP(*(.riscv.start));
        /* For RISC-V we need the `_start_trap` function to be 256 byte aligned,
         * and that function is at the start of the .riscv.trap section. If that
         * function does not exist (as for non-RISC-V platforms) then we do not
         * need any unusual alignment.
         * The allignment is implementation specific, so we currently use 256 to
         * work with the lowRISC CPUs.
         */
        . = DEFINED(_start_trap) ? ALIGN(256) : ALIGN(1);
        KEEP(*(.riscv.trap_vectored));
        KEEP(*(.riscv.trap));

        /* .text and .rodata hold most program code and immutable constants */
        /* .gnu.linkonce hold C++ elements with vague linkage
                https://gcc.gnu.org/onlinedocs/gcc/Vague-Linkage.html */
        *(.text .text.* .gnu.linkonce.t.*)

        _srodata = .;
        *(.rodata .rodata.* .gnu.linkonce.r.*)

        /* C++ exception unwinding information */
        *(.ARM.extab* .gnu.linkonce.armextab.*)

        /* glue_7 and glue_7t hold helper functions emitted by the compiler to
           support interworking (linking between functions in ARM and THUMB
           mode). Note that Cortex-M's do not support ARM mode, but this is left
           here to save someone headache if they ever attempt to port Tock to a
           Cortex-A core.  */
        *(.glue_7t) *(.glue_7)


        /* Constructor and destructor sections:

           - init/fini
              Defined by ELF as sections that hold `process
              initialization/termination code`
           - {pre}{init/fini}_array_{start/end}
              Symbols used by the C runtime for initialization / termination
           - ctors/dtors
              Symbols used by the C++ runtime for initialization / termination
        */
        . = ALIGN(4);
        KEEP(*(.init))
        . = ALIGN(4);
        __preinit_array_start = .;
        KEEP (*(.preinit_array))
        __preinit_array_end = .;

        . = ALIGN(4);
        __init_array_start = .;
        KEEP (*(SORT(.init_array.*)))
        KEEP (*(.init_array))
        __init_array_end = .;

        . = ALIGN(4);
        KEEP (*crtbegin.o(.ctors))
        KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
        KEEP (*(SORT(.ctors.*)))
        KEEP (*crtend.o(.ctors))

        . = ALIGN(4);
        KEEP(*(.fini))

        . = ALIGN(4);
        __fini_array_start = .;
        KEEP (*(.fini_array))
        KEEP (*(SORT(.fini_array.*)))
        __fini_array_end = .;

        KEEP (*crtbegin.o(.dtors))
        KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
        KEEP (*(SORT(.dtors.*)))
        KEEP (*crtend.o(.dtors))
        /* End constructor/destructor */
    } > rom


    /* ARM Exception support
     *
     * This contains compiler-generated support for unwinding the stack,
     * consisting of key-value pairs of function addresses and information on
     * how to unwind stack frames.
     * https://wiki.linaro.org/KenWerner/Sandbox/libunwind?action=AttachFile&do=get&target=libunwind-LDS.pdf
     *
     * .ARM.exidx is sorted, so has to go in its own output section.
     */
    PROVIDE_HIDDEN (__exidx_start = .);
    .ARM.exidx :
    {
      /* (C++) Index entries for section unwinding */
      *(.ARM.exidx* .gnu.linkonce.armexidx.*)
    } > rom
    PROVIDE_HIDDEN (__exidx_end = .);

    /* Region for on-chip kernel non-volatile storage.
     *
     * Align on PAGE_SIZE number of bytes. Volumes within this region are
     * allocated with the storage_volume! macro in utils.rs.
     */
    .storage :
    {
      . = ALIGN(PAGE_SIZE);
      _sstorage = .;
      *(.storage* storage*)
      _estorage = .;
      . = ALIGN(PAGE_SIZE);
    } > rom
    . = ALIGN(PAGE_SIZE);

    /* Mark the end of static elements */
    . = ALIGN(4);
    _erodata = .;
    _etext = .;
    _textend = .;   /* alias for _etext expected by some MS toolchains */


    /* Customer configuration is most often located at the end of the rom. It is
     * conditional, and won't be written if not specified in the board specific
     * linker file.
     */
    .ccfg : {
        KEEP(*(.ccfg))
    } > ccfg


    /* Section for application binaries in flash.
     *
     * This section is put into the "prog" memory, which is reserved for
     * applications. This section is not used for the kernel, but including it
     * in the .elf file allows for concatenating application binaries with the
     * kernel.
     */
    .apps :
    {
        /* _sapps symbol used by Tock to look for first application. */
        . = ALIGN(4);
        _sapps = .;

        /* Include placeholder bytes in this section so that the linker
         * includes a segment for it. Otherwise the section will be empty and
         * the linker will ignore it when defining the segments.
         * If less then 4 bytes, some linkers set this section to size 0
         * and openocd fails to write it.
         *
         * An issue has been submitted https://github.com/raspberrypi/openocd/issues/25
         */
        BYTE(0xFF)
        BYTE(0xFF)
        BYTE(0xFF)
        BYTE(0xFF)
    } > prog
    /* _eapps symbol used by tock to calculate the length of app flash */
    _eapps = _sapps + LENGTH(prog);







    /* Kernel data that must be relocated. This is program data that is
     * expected to live in SRAM, but is initialized with a value. This data is
     * physically placed into flash and is copied into SRAM by Tock. The
     * symbols here will be defined with addresses in SRAM.
     *
     * Tock assumes the relocation section follows all static elements and will
     * copy (_erelocate - _srelocate) bytes from _etext to _srelocate.
     */
    .relocate :
    {
        . = ALIGN(4);
        _srelocate = .;

        /* The Global Pointer is used by the RISC-V architecture to provide
         * "gp-relative" addressing. The global pointer is set to the gp
         * register once on boot, and the linker can then take advantage of this
         * when emitting instructions by using offsets relative to this known
         * value. Since RISC-V has only 12 bit immediates, this can help reduce
         * code size.
         *
         * The standard is to set the global pointer to 0x800 past the beginning
         * of the data section in RAM. This allows instructions to use 12 bit
         * immediates to access the first 4KB of data memory. In theory the GP
         * can be set to any value, but it should be placed near actual data for
         * the compiler to actually be able to use it.
         *
         * Per convention, the variable _must_ be called __global_pointer$ for
         * the linker to actually take advantage of it.
         */
        PROVIDE(__global_pointer$ = . + 0x800);

        *(.ramfunc .ramfunc.*);
        *(.sdata .sdata.* .gnu.linkonce.r.*)
        *(.data .data.*);

        . = ALIGN(4);
        _erelocate = .;
    } > ram AT>rom


    .sram (NOLOAD) :
    {
        /* Kernel BSS section. Memory that is expected to be initialized to
         * zero.
         *
         * Elements in this section do not contribute to the binary size. Tock
         * initialization will write zeros to the memory between _szero and
         * _ezero.
         *
         * Elements placed in the .bss and .COMMON sections are simply used to
         * measure amount of memory to zero out.
         */
        . = ALIGN(4);
        _szero = .;

        /* In addition to the traditional .bss section, RISC-V splits out a "small data" section
         * see: https://github.com/riscv/riscv-pk/blob/a3e4ac61d2b1ff37a22b9193b85d3b94273e80cb/pk/pk.lds#L84
         */
        *(.sbss .sbss.* .bss .bss.*);
        *(COMMON)

        . = ALIGN(4);
        _ezero = .;



        /* Application Memory.
         *
         * Tock uses the remainder of SRAM for application memory.
         *
         * Currently, Tock allocates a fixed array of application memory at
         * compile-time, and that array is simply placed here. A possible
         * future enhancement may allow the kernel to parcel this memory space
         * dynamically, requiring changes to this section.
         */
        _sappmem = .;
        *(.app_memory)
    } > ram
    _eappmem = ORIGIN(ram) + LENGTH(ram);

    /* Discard RISC-V relevant .eh_frame, we are not doing unwind on panic
       so it is not needed. */
    /DISCARD/ :
    {
      *(.eh_frame);
    }
}

ASSERT((_etext-_stext) + (_erelocate-_srelocate) < LENGTH(rom), "
Text plus relocations exceeds the available ROM space.");

@matu3ba matu3ba mentioned this issue Jul 19, 2023
Open
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