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84 lines
2.2 KiB
ArmAsm
84 lines
2.2 KiB
ArmAsm
/* PowerPC-specific implementation of profiling support.
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Copyright (C) 1997-2013 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, see
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<http://www.gnu.org/licenses/>. */
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/* This would be bad. */
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#ifdef PROF
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#undef PROF
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#endif
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#include <sysdep.h>
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/* We do profiling as described in the SYSV ELF ABI, except that glibc
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_mcount manages its own counters. The caller has put the address the
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caller will return to in the usual place on the stack, 4(r1). _mcount
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is responsible for ensuring that when it returns no argument-passing
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registers are disturbed, and that the LR is set back to (what the
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caller sees as) 4(r1).
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This is intended so that the following code can be inserted at the
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front of any routine without changing the routine:
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.data
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mflr r0
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stw r0,4(r1)
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bl _mcount
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*/
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ENTRY(_mcount)
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stwu r1,-48(r1)
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cfi_adjust_cfa_offset (48)
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/* We need to save the parameter-passing registers. */
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stw r3, 12(r1)
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stw r4, 16(r1)
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stw r5, 20(r1)
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stw r6, 24(r1)
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mflr r4
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lwz r3, 52(r1)
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mfcr r5
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stw r7, 28(r1)
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stw r8, 32(r1)
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stw r9, 36(r1)
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stw r10,40(r1)
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stw r4, 44(r1)
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cfi_offset (lr, -4)
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stw r5, 8(r1)
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#ifndef SHARED
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bl JUMPTARGET(__mcount_internal)
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#else
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bl __mcount_internal@local
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#endif
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/* Restore the registers... */
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lwz r6, 8(r1)
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lwz r0, 44(r1)
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lwz r3, 12(r1)
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mtctr r0
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lwz r4, 16(r1)
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mtcrf 0xff,r6
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lwz r5, 20(r1)
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lwz r6, 24(r1)
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lwz r0, 52(r1)
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lwz r7, 28(r1)
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lwz r8, 32(r1)
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mtlr r0
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lwz r9, 36(r1)
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lwz r10,40(r1)
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/* ...unwind the stack frame, and return to your usual programming. */
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addi r1,r1,48
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bctr
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END(_mcount)
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