diff options
Diffstat (limited to 'sysdeps/s390/s390-64/s390x-mcount.S')
| -rw-r--r-- | sysdeps/s390/s390-64/s390x-mcount.S | 81 |
1 files changed, 22 insertions, 59 deletions
diff --git a/sysdeps/s390/s390-64/s390x-mcount.S b/sysdeps/s390/s390-64/s390x-mcount.S index c6b5d65e17..9e8184c3ef 100644 --- a/sysdeps/s390/s390-64/s390x-mcount.S +++ b/sysdeps/s390/s390-64/s390x-mcount.S @@ -1,6 +1,5 @@ /* 64 bit S/390-specific implementation of profiling support. - Copyright (C) 2001-2018 Free Software Foundation, Inc. - Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com) + Copyright (C) 2018-2019 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 @@ -15,63 +14,27 @@ You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> - -/* How profiling works on 64 bit S/390: - On the start of each function _mcount is called with the address of a - data word in %r1 (initialized to 0, used for counting). The compiler - with the option -p generates code of the form: - - STM 6,15,24(15) - BRAS 13,.LTN0_0 - .LT0_0: - .LC13: .long .LP0 - .data - .align 4 - .LP0: .long 0 - .text - # function profiler - stg 14,4(15) - lg 1,.LC13-.LT0_0(13) - brasl 14,_mcount - lg 14,4(15) - - The _mcount implementation now has to call __mcount_internal with the - address of .LP0 as first parameter and the return address as second - parameter. &.LP0 was loaded to %r1 and the return address is in %r14. - _mcount may not modify any register. */ - - .globl C_SYMBOL_NAME(_mcount) - .type C_SYMBOL_NAME(_mcount), @function - cfi_startproc - .align ALIGNARG(4) -C_LABEL(_mcount) - /* Save the caller-clobbered registers. */ - aghi %r15,-224 - cfi_adjust_cfa_offset (224) - stmg %r14,%r5,160(%r15) - cfi_offset (r14, 0) - cfi_offset (r15, 8) - lg %r2,232(%r15) # callers address = first parameter - la %r2,0(%r2) # clear bit 0 - la %r3,0(%r14) # callees address = second parameter - -#ifdef PIC - brasl %r14,__mcount_internal@PLT -#else - brasl %r14,__mcount_internal -#endif - - /* Pop the saved registers. Please note that `mcount' has no - return value. */ - lmg %r14,%r5,160(%r15) - aghi %r15,224 - cfi_adjust_cfa_offset (-224) - br %r14 - cfi_endproc - ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount)) + <https://www.gnu.org/licenses/>. */ + +#define MCOUNT_SYMBOL _mcount +#define MCOUNT_CALLER_OFF 232 /* Pushed by the _mcount stub. */ +#define MCOUNT_CALLEE_REG 14 /* Normal calling convention. */ +#define MCOUNT_RETURN_REG 14 +#include "s390x-mcount.h" +#undef MCOUNT_SYMBOL +#undef MCOUNT_CALLER_OFF +#undef MCOUNT_CALLEE_REG +#undef MCOUNT_RETURN_REG + +#define MCOUNT_SYMBOL __fentry__ +#define MCOUNT_CALLER_OFF 160 /* Saved %r14. */ +#define MCOUNT_CALLEE_REG 0 /* __fentry__ calling convention. */ +#define MCOUNT_RETURN_REG 1 /* Cannot return via %r0. */ +#include "s390x-mcount.h" +#undef MCOUNT_SYMBOL +#undef MCOUNT_CALLER_OFF +#undef MCOUNT_CALLEE_REG +#undef MCOUNT_RETURN_REG #undef mcount weak_alias (_mcount, mcount) |