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/* PowerPC-specific implementation of profiling support.
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Copyright (C) 1997, 1999, 2005, 2006 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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/* 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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cfi_adjust_cfa_offset (48)
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/* We need to save the parameter-passing registers. */
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bl JUMPTARGET(__mcount_internal)
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/* Restore the registers... */
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/* ...unwind the stack frame, and return to your usual programming. */