diff options
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/_mcount.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/x86_64/_mcount.S b/sysdeps/x86_64/_mcount.S index c005932c0c..ef046dc3c5 100644 --- a/sysdeps/x86_64/_mcount.S +++ b/sysdeps/x86_64/_mcount.S @@ -65,3 +65,41 @@ C_LABEL(_mcount) #undef mcount weak_alias (_mcount, mcount) + + ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(__fentry__) + ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(__fentry__), @function) + .align ALIGNARG(4) +C_LABEL(__fentry__) + /* Allocate space for 7 registers. */ + subq $64,%rsp + movq %rax,(%rsp) + movq %rcx,8(%rsp) + movq %rdx,16(%rsp) + movq %rsi,24(%rsp) + movq %rdi,32(%rsp) + movq %r8,40(%rsp) + movq %r9,48(%rsp) + + /* Setup parameter for __mcount_internal. */ + /* selfpc is the return address on the stack. */ + movq 64(%rsp),%rsi + /* caller is the return address above it */ + movq 72(%rsp),%rdi +#ifdef PIC + call C_SYMBOL_NAME(__mcount_internal)@PLT +#else + call C_SYMBOL_NAME(__mcount_internal) +#endif + /* Pop the saved registers. Please note that `__fentry__' has no + return value. */ + movq 48(%rsp),%r9 + movq 40(%rsp),%r8 + movq 32(%rsp),%rdi + movq 24(%rsp),%rsi + movq 16(%rsp),%rdx + movq 8(%rsp),%rcx + movq (%rsp),%rax + addq $64,%rsp + ret + + ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) |