Move ARM EABI mcount into a separate .S file.
This commit is contained in:
Thomas Schwinge
Joseph Myers
parent
8ef2c3b0f7
commit
2423dc241a
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@ -1,3 +1,12 @@
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2009-12-16 Thomas Schwinge <thomas@codesourcery.com>
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* sysdeps/arm/eabi/Makefile [gmon] (sysdep_routines): Add arm-mcount.
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* sysdeps/arm/eabi/machine-gmon.h (mcount_internal): Define to
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`__mcount_internal'.
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(MCOUNT (__gnu_mcount_nc), OLD_MCOUNT (_mcount), mcount): Move to...
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* sysdeps/arm/eabi/arm-mcount.S: ... this new file as __gnu_mcount_nc,
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_mcount, and mcount, respectively.
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2009-12-15 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/unix/sysv/linux/arm/bits/fcntl.h: Redefine O_SYNC and
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@ -12,6 +12,10 @@ static-only-routines += $(aeabi_constants)
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gen-as-const-headers += rtld-global-offsets.sym
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endif
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ifeq ($(subdir),gmon)
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sysdep_routines += arm-mcount
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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@ -0,0 +1,83 @@
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/* Implementation of profiling support. ARM EABI version.
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Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Don't call mcount when calling mcount... */
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#undef PROF
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#include <sysdep.h>
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#ifdef __thumb2__
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.thumb
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.syntax unified
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#endif
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/* Use an assembly stub with a special ABI. The calling lr has been
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pushed to the stack (which will be misaligned). We should preserve
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all registers except ip and pop a word off the stack.
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NOTE: This assumes mcount_internal does not clobber any non-core
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(coprocessor) registers. Currently this is true, but may require
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additional attention in the future.
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The calling sequence looks something like:
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func:
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push {lr}
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bl __gnu_mount_nc
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<function body>
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*/
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ENTRY(__gnu_mcount_nc)
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push {r0, r1, r2, r3, lr}
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bic r1, lr, #1
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ldr r0, [sp, #20]
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bl __mcount_internal
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pop {r0, r1, r2, r3, ip, lr}
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bx ip
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END(__gnu_mcount_nc)
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/* Provide old mcount for backwards compatibility. This requires
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code be compiled with APCS frame pointers. */
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ENTRY(_mcount)
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stmdb sp!, {r0, r1, r2, r3, fp, lr}
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#ifdef __thumb2__
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movs r0, fp
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ittt ne
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ldrne r0, [r0, #-4]
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#else
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movs fp, fp
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ldrne r0, [fp, #-4]
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#endif
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movnes r1, lr
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blne __mcount_internal
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#ifdef __thumb2__
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ldmia sp!, {r0, r1, r2, r3, fp, pc}
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#else
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ldmia sp!, {r0, r1, r2, r3, fp, lr}
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bx lr
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#endif
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END(_mcount)
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/* The canonical name for the function is `_mcount' in both C and asm,
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but some old asm code might assume it's `mcount'. */
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#undef mcount
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weak_alias (_mcount, mcount)
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@ -1,5 +1,5 @@
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/* Machine-dependent definitions for profiling support. ARM EABI version.
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Copyright (C) 2008 Free Software Foundation, Inc.
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Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -17,83 +17,18 @@
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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/* GCC for the ARM cannot compile __builtin_return_address(N) for N != 0,
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so we must use an assembly stub. */
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#include <sysdep.h>
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static void mcount_internal (u_long frompc, u_long selfpc) __attribute_used__;
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/* We must not pollute the global namespace. */
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#define mcount_internal __mcount_internal
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extern void mcount_internal (u_long frompc, u_long selfpc) internal_function;
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#define _MCOUNT_DECL(frompc, selfpc) \
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static void mcount_internal (u_long frompc, u_long selfpc)
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/* Use an assembly stub with a special ABI. The calling lr has been
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pushed to the stack (which will be misaligned). We should preserve
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all registers except ip and pop a word off the stack.
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NOTE: This assumes mcount_internal does not clobber any non-core
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(coprocessor) registers. Currently this is true, but may require
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additional attention in the future.
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The calling sequence looks something like:
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func:
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push {lr}
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bl __gnu_mount_nc
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<function body>
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*/
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void internal_function mcount_internal (u_long frompc, u_long selfpc)
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#define MCOUNT \
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void __attribute__((__naked__)) __gnu_mcount_nc(void) \
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{ \
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asm ("push {r0, r1, r2, r3, lr}\n\t" \
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"bic r1, lr, #1\n\t" \
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"ldr r0, [sp, #20]\n\t" \
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"bl mcount_internal\n\t" \
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"pop {r0, r1, r2, r3, ip, lr}\n\t" \
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"bx ip"); \
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} \
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OLD_MCOUNT
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/* Provide old mcount for backwards compatibility. This requires
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code be compiled with APCS frame pointers. */
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#ifndef NO_UNDERSCORES
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/* The asm symbols for C functions are `_function'.
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The canonical name for the counter function is `mcount', no _. */
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void _mcount (void) asm ("mcount");
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#else
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/* The canonical name for the function is `_mcount' in both C and asm,
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but some old asm code might assume it's `mcount'. */
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void _mcount (void);
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weak_alias (_mcount, mcount)
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#endif
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#ifdef __thumb2__
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#define OLD_MCOUNT \
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void __attribute__((__naked__)) _mcount (void) \
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{ \
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__asm__("push {r0, r1, r2, r3, fp, lr};" \
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"movs r0, fp;" \
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"ittt ne;" \
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"ldrne r0, [r0, #-4];" \
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"movsne r1, lr;" \
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"blne mcount_internal;" \
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"pop {r0, r1, r2, r3, fp, pc}"); \
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}
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#else
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#define OLD_MCOUNT \
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void __attribute__((__naked__)) _mcount (void) \
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{ \
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__asm__("stmdb sp!, {r0, r1, r2, r3, fp, lr};" \
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"movs fp, fp;" \
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"ldrne r0, [fp, #-4];" \
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"movnes r1, lr;" \
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"blne mcount_internal;" \
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"ldmia sp!, {r0, r1, r2, r3, fp, lr};" \
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"bx lr"); \
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}
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#endif
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/* Define MCOUNT as empty since we have the implementation in another file. */
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#define MCOUNT
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