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Make sure that stack is 16-byte aligned before calling a function,

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as it is required by amd64 ABI. Add a comment for the places were
the stack is accidentally properly aligned already.

PR:	amd64/162214
Submitted by:	yamayan <yamayan kbh biglobe ne jp>
MFC after:	1 week
This commit is contained in:
kib 2011-11-02 18:06:22 +00:00
parent 953d552ca4
commit d5bbfd2b4a
2 changed files with 6 additions and 0 deletions
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3
lib/libc/amd64/gen/setjmp.S
View File

@ -54,6 +54,7 @@ ENTRY(setjmp)
movq $1,%rdi /* SIG_BLOCK */
movq $0,%rsi /* (sigset_t*)set */
leaq 72(%rcx),%rdx /* 9,10; (sigset_t*)oset */
/* stack is 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
popq %rdi
movq %rdi,%rcx
@ -81,7 +82,9 @@ ENTRY(__longjmp)
movq $3,%rdi /* SIG_SETMASK */
leaq 72(%rdx),%rsi /* (sigset_t*)set */
movq $0,%rdx /* (sigset_t*)oset */
subq $0x8,%rsp /* make the stack 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
addq $0x8,%rsp
popq %rsi
popq %rdi /* jmpbuf */
movq %rdi,%rdx

3
lib/libc/amd64/gen/sigsetjmp.S
View File

@ -62,6 +62,7 @@ ENTRY(sigsetjmp)
movq $1,%rdi /* SIG_BLOCK */
movq $0,%rsi /* (sigset_t*)set */
leaq 72(%rcx),%rdx /* 9,10 (sigset_t*)oset */
/* stack is 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
popq %rdi
2: movq %rdi,%rcx
@ -90,7 +91,9 @@ ENTRY(__siglongjmp)
movq $3,%rdi /* SIG_SETMASK */
leaq 72(%rdx),%rsi /* (sigset_t*)set */
movq $0,%rdx /* (sigset_t*)oset */
subq $0x8,%rsp /* make the stack 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
addq $0x8,%rsp
popq %rsi
popq %rdi /* jmpbuf */
2: movq %rdi,%rdx