diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/ppc-mcount.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/ppc-mcount.S | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/sysdeps/powerpc/powerpc32/ppc-mcount.S b/sysdeps/powerpc/powerpc32/ppc-mcount.S index 314c8ee703..c1a08d379c 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 Free Software Foundation, Inc. + Copyright (C) 1997, 1999, 2005 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 @@ -24,25 +24,19 @@ #include <sysdep.h> -/* 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). +/* 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). 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 */ |