diff options
Diffstat (limited to 'src/pkg/runtime/sys_x86.c')
-rw-r--r-- | src/pkg/runtime/sys_x86.c | 57 |
1 files changed, 0 insertions, 57 deletions
diff --git a/src/pkg/runtime/sys_x86.c b/src/pkg/runtime/sys_x86.c deleted file mode 100644 index a450b3e58..000000000 --- a/src/pkg/runtime/sys_x86.c +++ /dev/null @@ -1,57 +0,0 @@ -// Copyright 2013 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// +build amd64 amd64p32 386 - -#include "runtime.h" - -// adjust Gobuf as it if executed a call to fn with context ctxt -// and then did an immediate gosave. -void -runtime·gostartcall(Gobuf *gobuf, void (*fn)(void), void *ctxt) -{ - uintptr *sp; - - sp = (uintptr*)gobuf->sp; - if(sizeof(uintreg) > sizeof(uintptr)) - *--sp = 0; - *--sp = (uintptr)gobuf->pc; - gobuf->sp = (uintptr)sp; - gobuf->pc = (uintptr)fn; - gobuf->ctxt = ctxt; -} - -// Called to rewind context saved during morestack back to beginning of function. -// To help us, the linker emits a jmp back to the beginning right after the -// call to morestack. We just have to decode and apply that jump. -void -runtime·rewindmorestack(Gobuf *gobuf) -{ - byte *pc; - - pc = (byte*)gobuf->pc; - if(pc[0] == 0xe9) { // jmp 4-byte offset - gobuf->pc = gobuf->pc + 5 + *(int32*)(pc+1); - return; - } - if(pc[0] == 0xeb) { // jmp 1-byte offset - gobuf->pc = gobuf->pc + 2 + *(int8*)(pc+1); - return; - } - if(pc[0] == 0xcc) { - // This is a breakpoint inserted by gdb. We could use - // runtime·findfunc to find the function. But if we - // do that, then we will continue execution at the - // function entry point, and we will not hit the gdb - // breakpoint. So for this case we don't change - // gobuf->pc, so that when we return we will execute - // the jump instruction and carry on. This means that - // stack unwinding may not work entirely correctly - // (http://golang.org/issue/5723) but the user is - // running under gdb anyhow. - return; - } - runtime·printf("runtime: pc=%p %x %x %x %x %x\n", pc, pc[0], pc[1], pc[2], pc[3], pc[4]); - runtime·throw("runtime: misuse of rewindmorestack"); -} |