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Avoid clobbering the red zone when running on the new context's stack in

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_amd64_restore_context().
This commit is contained in:
Tim J. Robbins 2004-06-07 21:25:16 +00:00
parent 4559c1817b
commit bf1d6a62b0
2 changed files with 10 additions and 0 deletions
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5
lib/libkse/arch/amd64/amd64/context.S
View file

@ -109,6 +109,8 @@ __FBSDID("$FreeBSD$");
#define MC_RFLAGS (22 * 8)
#define MC_RSP (23 * 8)
#define REDZONE 128 /* size of the red zone */
/*
* _amd64_ctx_save(mcontext_t *mcp)
*
@ -188,6 +190,7 @@ ENTRY(_amd64_restore_context)
4: fninit
fldcw MC_FP_CW_OFFSET(%rdi)
5: movq MC_RSP(%rdi), %rsp /* switch to context stack */
subq $REDZONE, %rsp
movq MC_RIP(%rdi), %rax /* return address on stack */
pushq %rax
movq MC_RDI(%rdi), %rax /* rdi on stack */
@ -207,4 +210,6 @@ ENTRY(_amd64_restore_context)
popq %rsi /* restore rsi, rdx, and rdi */
popq %rdx
popq %rdi
leaq (8 + REDZONE)(%rsp), %rsp
jmp *-(8 + REDZONE)(%rsp) /* jump to return address */
7: ret

5
lib/libpthread/arch/amd64/amd64/context.S
View file

@ -109,6 +109,8 @@ __FBSDID("$FreeBSD$");
#define MC_RFLAGS (22 * 8)
#define MC_RSP (23 * 8)
#define REDZONE 128 /* size of the red zone */
/*
* _amd64_ctx_save(mcontext_t *mcp)
*
@ -188,6 +190,7 @@ ENTRY(_amd64_restore_context)
4: fninit
fldcw MC_FP_CW_OFFSET(%rdi)
5: movq MC_RSP(%rdi), %rsp /* switch to context stack */
subq $REDZONE, %rsp
movq MC_RIP(%rdi), %rax /* return address on stack */
pushq %rax
movq MC_RDI(%rdi), %rax /* rdi on stack */
@ -207,4 +210,6 @@ ENTRY(_amd64_restore_context)
popq %rsi /* restore rsi, rdx, and rdi */
popq %rdx
popq %rdi
leaq (8 + REDZONE)(%rsp), %rsp
jmp *-(8 + REDZONE)(%rsp) /* jump to return address */
7: ret