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x86: Add support for frame pointer less mcount
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@ -1,3 +1,10 @@
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2010-07-17 Andi Kleen <ak@linux.intel.com>
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* sysdeps/i386/i386-mcount.S (__fentry__): Define.
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* sysdeps/x86_64/_mcount.S (__fentry__): Define.
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* stdlib/Versions (__fentry__): Add for GLIBC 2.13
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* Versions.def [GLIBC_2.13]: Add.
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2010-08-06 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/unix/sysv/linux/getlogin_r.c (__getlogin_r_loginuid):
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@ -29,6 +29,7 @@ libc {
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GLIBC_2.10
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GLIBC_2.11
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GLIBC_2.12
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GLIBC_2.13
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%ifdef USE_IN_LIBIO
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HURD_CTHREADS_0.3
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%endif
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@ -100,6 +100,9 @@ libc {
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GLIBC_2.10 {
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quick_exit; __cxa_at_quick_exit;
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}
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GLIBC_2.13 {
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__fentry__;
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}
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GLIBC_PRIVATE {
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# functions which have an additional interface since they are
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# are cancelable.
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@ -53,3 +53,28 @@ C_LABEL(_mcount)
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#undef mcount
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weak_alias (_mcount, mcount)
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/* Same as above, but doesn't require a frame pointer */
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(__fentry__)
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ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(__fentry__), @function)
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.align ALIGNARG(4)
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C_LABEL(__fentry__)
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/* Save the caller-clobbered registers. */
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pushl %eax
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pushl %ecx
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pushl %edx
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movl 12(%esp), %edx
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movl 16(%esp), %eax
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/* No need to access the PLT or GOT, __mcount_internal is an
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internal function and we can make a relative call. */
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call C_SYMBOL_NAME(__mcount_internal)
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/* Pop the saved registers. Please note that `__fentry__' has no
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return value. */
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popl %edx
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popl %ecx
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popl %eax
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ret
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ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__))
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@ -65,3 +65,41 @@ C_LABEL(_mcount)
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#undef mcount
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weak_alias (_mcount, mcount)
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(__fentry__)
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ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(__fentry__), @function)
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.align ALIGNARG(4)
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C_LABEL(__fentry__)
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/* Allocate space for 7 registers. */
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subq $64,%rsp
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movq %rax,(%rsp)
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movq %rcx,8(%rsp)
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movq %rdx,16(%rsp)
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movq %rsi,24(%rsp)
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movq %rdi,32(%rsp)
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movq %r8,40(%rsp)
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movq %r9,48(%rsp)
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/* Setup parameter for __mcount_internal. */
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/* selfpc is the return address on the stack. */
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movq 64(%rsp),%rsi
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/* caller is the return address above it */
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movq 72(%rsp),%rdi
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#ifdef PIC
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call C_SYMBOL_NAME(__mcount_internal)@PLT
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#else
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call C_SYMBOL_NAME(__mcount_internal)
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#endif
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/* Pop the saved registers. Please note that `__fentry__' has no
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return value. */
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movq 48(%rsp),%r9
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movq 40(%rsp),%r8
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movq 32(%rsp),%rdi
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movq 24(%rsp),%rsi
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movq 16(%rsp),%rdx
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movq 8(%rsp),%rcx
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movq (%rsp),%rax
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addq $64,%rsp
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ret
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ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__))
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