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| author | dfr <dfr@FreeBSD.org> | 2005-05-19 07:32:42 +0000 |
|---|---|---|
| committer | dfr <dfr@FreeBSD.org> | 2005-05-19 07:32:42 +0000 |
| commit | 46ba1c3d373e6e1207a49bb8a190091eb180ee9f (patch) | |
| tree | c06c71b03081b9ea014399e7965883773eaba671 /libexec | |
| parent | e6963ec512a47d09e5f7ae62feb3ab7786a89598 (diff) | |
| download | FreeBSD-src-46ba1c3d373e6e1207a49bb8a190091eb180ee9f.zip FreeBSD-src-46ba1c3d373e6e1207a49bb8a190091eb180ee9f.tar.gz | |
Align the stack to a 16 byte boundary before calling _rtld so that we can
safely initialise shared libraries that use SSE in their init sections.
MFC After: 1 week
Diffstat (limited to 'libexec')
| -rw-r--r-- | libexec/rtld-elf/i386/rtld_start.S | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libexec/rtld-elf/i386/rtld_start.S b/libexec/rtld-elf/i386/rtld_start.S index 76f1392..9a6e2d5 100644 --- a/libexec/rtld-elf/i386/rtld_start.S +++ b/libexec/rtld-elf/i386/rtld_start.S @@ -32,17 +32,20 @@ .rtld_start: xorl %ebp,%ebp # Clear frame pointer for good form movl %esp,%eax # Save initial stack pointer - subl $8,%esp # A place to store exit procedure addr + movl %esp,%esi # Save initial stack pointer + andl $0xfffffff0,%esp # Align stack pointer + subl $16,%esp # A place to store exit procedure addr movl %esp,%ebx # save address of exit proc movl %esp,%ecx # construct address of obj_main addl $4,%ecx + subl $4,%esp # Keep stack aligned pushl %ecx # Pass address of obj_main pushl %ebx # Pass address of exit proc pushl %eax # Pass initial stack pointer to rtld call _rtld@PLT # Call rtld(sp); returns entry point - addl $12,%esp # Remove arguments from stack + addl $16,%esp # Remove arguments from stack popl %edx # Get exit procedure address - addl $4,%esp # Ignore obj_main + movl %esi,%esp # Ignore obj_main /* * At this point, %eax contains the entry point of the main program, and * %edx contains a pointer to a termination function that should be |
