Provide optimized assembly for PPOLL blocking syscall on i386

fako1024 · Sep 7, 2023 · 8b4a859 · 8b4a859
1 parent 8e23f5f
commit 8b4a859
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Showing 3 changed files with 28 additions and 4 deletions.
diff --git a/event/poll_386.s b/event/poll_386.s
@@ -0,0 +1,24 @@
+#include "textflag.h"
+
+#define INVOKE_SYSCALL INT $0x80
+#define SYS__PPOLL 0x135
+
+// func pollBlock(fds *unix.PollFd, nfds int) (err syscall.Errno)
+TEXT ·pollBlock(SB),NOSPLIT,$0-12
+	CALL  	runtime·entersyscallblock(SB)	// Call blocking SYSCALL directive from runtime package
+	MOVL	$SYS__PPOLL, AX			// Prepare / perform ppoll() SYSCALL    
+	MOVL	fds+0(FP), BX			// PollFDs parameter
+	MOVL	nfds+4(FP), CX		        // Put nFDs parameter
+	MOVL	$0x0, DX			// Put timeout parameter (set to NULL)
+	MOVL	$0x0, SI                      	// Put sigmask parameter (skip)
+	INVOKE_SYSCALL
+    CMPL    AX, $0xfffff002		        // No error / EINTR
+	JLS     success			        // Jump to success
+	NEGL    AX			// Negate SYSCALL errno
+	MOVL	AX, err+8(FP)			// Store error code in err return value
+	CALL  	runtime·exitsyscall(SB)		// Finalize SYSCALL using the directive from runtime package
+	RET					// Return
+success:
+	MOVL	$0, err+8(FP)			// Store NULL error code in err return value
+	CALL    runtime·exitsyscall(SB)		// Finalize SYSCALL using the directive from runtime package
+	RET					// Return
diff --git a/event/poll_asm.go b/event/poll_asm.go
@@ -1,5 +1,5 @@
-//go:build (linux && amd64) || (linux && arm64) || (linux && arm)
-// +build linux,amd64 linux,arm64 linux,arm
+//go:build (linux && amd64) || (linux && arm64) || (linux && arm) || (linux && 386)
+// +build linux,amd64 linux,arm64 linux,arm linux,386
 
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diff --git a/event/poll_default.go b/event/poll_default.go
@@ -1,5 +1,5 @@
-//go:build linux && !amd64 && !arm64 && !arm
-// +build linux,!amd64,!arm64,!arm
+//go:build linux && !amd64 && !arm64 && !arm && !386
+// +build linux,!amd64,!arm64,!arm,!386
 
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