diff options
Diffstat (limited to 'src/runtime/sys_arm.c')
| -rw-r--r-- | src/runtime/sys_arm.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/runtime/sys_arm.c b/src/runtime/sys_arm.c new file mode 100644 index 000000000..a65560e5b --- /dev/null +++ b/src/runtime/sys_arm.c @@ -0,0 +1,35 @@ +// 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. + +#include "runtime.h" + +// adjust Gobuf as if it executed a call to fn with context ctxt +// and then did an immediate Gosave. +void +runtime·gostartcall(Gobuf *gobuf, void (*fn)(void), void *ctxt) +{ + if(gobuf->lr != 0) + runtime·throw("invalid use of gostartcall"); + gobuf->lr = gobuf->pc; + 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) +{ + uint32 inst; + + inst = *(uint32*)gobuf->pc; + if((gobuf->pc&3) == 0 && (inst>>24) == 0x9a) { + //runtime·printf("runtime: rewind pc=%p to pc=%p\n", gobuf->pc, gobuf->pc + ((int32)(inst<<8)>>6) + 8); + gobuf->pc += ((int32)(inst<<8)>>6) + 8; + return; + } + runtime·printf("runtime: pc=%p %x\n", gobuf->pc, inst); + runtime·throw("runtime: misuse of rewindmorestack"); +} |