Date: Fri, 30 Dec 2011 18:22:35 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r229010 - stable/8/lib/libc/amd64/gen Message-ID: <201112301822.pBUIMZCl024726@svn.freebsd.org>
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Author: kib Date: Fri Dec 30 18:22:34 2011 New Revision: 229010 URL: http://svn.freebsd.org/changeset/base/229010 Log: MFC r227023: Make sure that stack is 16-byte aligned before calling a function, as it is required by amd64 ABI. Add a comment for the places were the stack is accidentally properly aligned already. PR: amd64/162214 Modified: stable/8/lib/libc/amd64/gen/setjmp.S stable/8/lib/libc/amd64/gen/sigsetjmp.S Directory Properties: stable/8/lib/libc/ (props changed) Modified: stable/8/lib/libc/amd64/gen/setjmp.S ============================================================================== --- stable/8/lib/libc/amd64/gen/setjmp.S Fri Dec 30 18:20:44 2011 (r229009) +++ stable/8/lib/libc/amd64/gen/setjmp.S Fri Dec 30 18:22:34 2011 (r229010) @@ -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 Modified: stable/8/lib/libc/amd64/gen/sigsetjmp.S ============================================================================== --- stable/8/lib/libc/amd64/gen/sigsetjmp.S Fri Dec 30 18:20:44 2011 (r229009) +++ stable/8/lib/libc/amd64/gen/sigsetjmp.S Fri Dec 30 18:22:34 2011 (r229010) @@ -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
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