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| author | Andi Kleen <ak@linux.intel.com> | 2010-08-07 21:24:05 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2010-08-07 21:24:05 -0700 |
| commit | d22e4cc9397ed41534c9422d0b0ffef8c77bfa53 (patch) | |
| tree | cf2a4b5b9970dcb959f2b41e44e38ff2914657bd /sysdeps/i386/i386-mcount.S | |
| parent | 805bc17d6883bf6d47e49620d6f8e1b97cac9901 (diff) | |
| download | glibc-d22e4cc9397ed41534c9422d0b0ffef8c77bfa53.tar.gz glibc-d22e4cc9397ed41534c9422d0b0ffef8c77bfa53.tar.xz glibc-d22e4cc9397ed41534c9422d0b0ffef8c77bfa53.zip | |
x86: Add support for frame pointer less mcount
Diffstat (limited to 'sysdeps/i386/i386-mcount.S')
| -rw-r--r-- | sysdeps/i386/i386-mcount.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/sysdeps/i386/i386-mcount.S b/sysdeps/i386/i386-mcount.S index 8b11adb2e3..43bc0194dd 100644 --- a/sysdeps/i386/i386-mcount.S +++ b/sysdeps/i386/i386-mcount.S @@ -53,3 +53,28 @@ C_LABEL(_mcount) #undef mcount weak_alias (_mcount, mcount) + + /* Same as above, but doesn't require a frame pointer */ + ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(__fentry__) + ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(__fentry__), @function) + .align ALIGNARG(4) +C_LABEL(__fentry__) + /* Save the caller-clobbered registers. */ + pushl %eax + pushl %ecx + pushl %edx + + movl 12(%esp), %edx + movl 16(%esp), %eax + + /* No need to access the PLT or GOT, __mcount_internal is an + internal function and we can make a relative call. */ + call C_SYMBOL_NAME(__mcount_internal) + + /* Pop the saved registers. Please note that `__fentry__' has no + return value. */ + popl %edx + popl %ecx + popl %eax + ret + ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) |