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probestack: add frame pointers for easier traceback #306

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Merged
merged 1 commit into from
Jul 24, 2019
Merged

probestack: add frame pointers for easier traceback #306

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7 changes: 7 additions & 0 deletions src/probestack.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,9 @@ pub unsafe extern "C" fn __rust_probestack() {
// The ABI here is that the stack frame size is located in `%eax`. Upon
// return we're not supposed to modify `%esp` or `%eax`.
asm!("
pushq %rbp
movq %rsp, %rbp

mov %rax,%r11 // duplicate %rax as we're clobbering %r11

// Main loop, taken in one page increments. We're decrementing rsp by
Expand Down Expand Up @@ -89,6 +92,7 @@ pub unsafe extern "C" fn __rust_probestack() {
// return.
add %rax,%rsp

leave
ret
" ::: "memory" : "volatile");
::core::intrinsics::unreachable();
Expand All @@ -104,6 +108,8 @@ pub unsafe extern "C" fn __rust_probestack() {
//
// The ABI here is the same as x86_64, except everything is 32-bits large.
asm!("
push %ebp
mov %esp, %ebp
push %ecx
mov %eax,%ecx

Expand All @@ -122,6 +128,7 @@ pub unsafe extern "C" fn __rust_probestack() {

add %eax,%esp
pop %ecx
leave
ret
" ::: "memory" : "volatile");
::core::intrinsics::unreachable();
Expand Down