diff options
Diffstat (limited to 'community/go/fix-musl.patch')
| -rw-r--r-- | community/go/fix-musl.patch | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/community/go/fix-musl.patch b/community/go/fix-musl.patch deleted file mode 100644 index e70200118e..0000000000 --- a/community/go/fix-musl.patch +++ /dev/null @@ -1,70 +0,0 @@ -From 0f783bde485796c8e97789d285c825024d1ca8e4 Mon Sep 17 00:00:00 2001 -From: Shenghou Ma <minux@golang.org> -Date: Tue, 23 Feb 2016 01:26:50 -0500 -Subject: [PATCH] runtime, syscall: switch linux/386 to use int 0x80 - -Like bionic, musl also doesn't provide vsyscall helper in %gs:0x10, -and as int $0x80 is as fast as calling %gs:0x10, just use int $0x80 -always. - -Fixes #14476. - -Change-Id: I00ec8652060700e0a3c9b524bfe3c16a810263f6 ---- - -diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s -index 1a3aaf0..29ebd5e 100644 ---- a/src/runtime/sys_linux_386.s -+++ b/src/runtime/sys_linux_386.s -@@ -12,16 +12,17 @@ - - // Most linux systems use glibc's dynamic linker, which puts the - // __kernel_vsyscall vdso helper at 0x10(GS) for easy access from position --// independent code and setldt in this file does the same in the statically --// linked case. Android, however, uses bionic's dynamic linker, which does not --// save the helper anywhere, and so the only way to invoke a syscall from --// position independent code is boring old int $0x80 (which is also what --// bionic's syscall wrappers use). --#ifdef GOOS_android -+// independent code and setldt in runtime does the same in the statically -+// linked case. However, systems that use alternative libc such as Android's -+// bionic and musl, do not save the helper anywhere, and so the only way to -+// invoke a syscall from position independent code is boring old int $0x80 -+// (which is also what syscall wrappers in bionic/musl use). -+// -+// The benchmarks also showed that using int $0x80 is as fast as calling -+// *%gs:0x10 even on CPUs more than 6 years old. See https://golang.org/cl/16996 -+// for the benchmark program and raw data. -+//#define INVOKE_SYSCALL CALL 0x10(GS) // non-portable - #define INVOKE_SYSCALL INT $0x80 --#else --#define INVOKE_SYSCALL CALL 0x10(GS) --#endif - - TEXT runtime·exit(SB),NOSPLIT,$0 - MOVL $252, AX // syscall number -diff --git a/src/syscall/asm_linux_386.s b/src/syscall/asm_linux_386.s -index c940605..d5b1022 100644 ---- a/src/syscall/asm_linux_386.s -+++ b/src/syscall/asm_linux_386.s -@@ -12,18 +12,9 @@ - // func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); - // Trap # in AX, args in BX CX DX SI DI, return in AX - --// Most linux systems use glibc's dynamic linker, which puts the --// __kernel_vsyscall vdso helper at 0x10(GS) for easy access from position --// independent code and setldt in runtime does the same in the statically --// linked case. Android, however, uses bionic's dynamic linker, which does not --// save the helper anywhere, and so the only way to invoke a syscall from --// position independent code is boring old int $0x80 (which is also what --// bionic's syscall wrappers use). --#ifdef GOOS_android -+// See ../runtime/sys_linux_386.s for rationales. -+//#define INVOKE_SYSCALL CALL 0x10(GS) // non-portable - #define INVOKE_SYSCALL INT $0x80 --#else --#define INVOKE_SYSCALL CALL 0x10(GS) --#endif - - TEXT ·Syscall(SB),NOSPLIT,$0-28 - CALL runtime·entersyscall(SB) |