diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/ppc-mcount.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/ppc-mcount.S | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/sysdeps/powerpc/powerpc32/ppc-mcount.S b/sysdeps/powerpc/powerpc32/ppc-mcount.S index 7e39acb55b..a72d676bbe 100644 --- a/sysdeps/powerpc/powerpc32/ppc-mcount.S +++ b/sysdeps/powerpc/powerpc32/ppc-mcount.S @@ -1,5 +1,5 @@ /* PowerPC-specific implementation of profiling support. - Copyright (C) 1997, 1999, 2005, 2006 Free Software Foundation, Inc. + Copyright (C) 1997, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -14,8 +14,8 @@ You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA - 02110-1301 USA. */ + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ /* This would be bad. */ #ifdef PROF @@ -24,25 +24,30 @@ #include <sysdep.h> -/* We do profiling as described in the SYSV ELF ABI, except that glibc - _mcount manages its own counters. The caller has put the address the - caller will return to in the usual place on the stack, 4(r1). _mcount - is responsible for ensuring that when it returns no argument-passing - registers are disturbed, and that the LR is set back to (what the - caller sees as) 4(r1). +/* We do profiling as described in the SYSV ELF ABI, _mcount is called + with the address of a data word in r0 (that is different for every + routine, initialised to 0, and otherwise unused). The caller has put + the address the caller will return to in the usual place on the stack, + 4(r1). _mcount is responsible for ensuring that when it returns no + argument-passing registers are disturbed, and that the LR is set back + to (what the caller sees as) 4(r1). This is intended so that the following code can be inserted at the front of any routine without changing the routine: .data + .align 2 + 0: .long 0 + .previous mflr r0 + lis r11,0b@ha stw r0,4(r1) + addi r0,r11,0b@l bl _mcount */ ENTRY(_mcount) stwu r1,-48(r1) - cfi_adjust_cfa_offset (48) /* We need to save the parameter-passing registers. */ stw r3, 12(r1) stw r4, 16(r1) @@ -56,9 +61,8 @@ ENTRY(_mcount) stw r9, 36(r1) stw r10,40(r1) stw r4, 44(r1) - cfi_offset (lr, -4) stw r5, 8(r1) - bl __mcount_internal@local + bl JUMPTARGET(__mcount_internal) nop /* Restore the registers... */ lwz r6, 8(r1) |