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-/* Machine-specific calling sequence for `mcount' profiling function. alpha
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
- Contributed by David Mosberger (davidm@cs.arizona.edu).
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* Assembly stub to invoke _mcount(). Compiler generated code calls
- this stub after executing a function's prologue and without saving any
- registers. It is therefore necessary to preserve a0..a5 as they may
- contain function arguments. To work correctly with frame- less
- functions, it is also necessary to preserve ra. Finally, division
- routines are invoked with a special calling convention and the
- compiler treats those calls as if they were instructions. In
- particular, it doesn't save any of the temporary registers (caller
- saved registers). It is therefore necessary to preserve all
- caller-saved registers as well.
-
- Upon entering _mcount, register $at holds the return address and ra
- holds the return address of the function's caller (selfpc and frompc,
- respectively in gmon.c language...). */
-
-#include <sysdep.h>
-
- .set noat
- .set noreorder
-
-LEAF(_mcount, 0xb0)
- .prologue 0
-
- subq sp, 0xb0, sp
- stq a0, 0x00(sp)
- mov ra, a0 # a0 = caller-pc
- stq a1, 0x08(sp)
- mov $at, a1 # a1 = self-pc
- stq $at, 0x10(sp)
-
- stq a2, 0x18(sp)
- stq a3, 0x20(sp)
- stq a4, 0x28(sp)
- stq a5, 0x30(sp)
- stq ra, 0x38(sp)
- stq gp, 0x40(sp)
-
- br gp, 1f
-1: ldgp gp, 0(gp)
-
- stq t0, 0x48(sp)
- stq t1, 0x50(sp)
- stq t2, 0x58(sp)
- stq t3, 0x60(sp)
- stq t4, 0x68(sp)
- stq t5, 0x70(sp)
- stq t6, 0x78(sp)
-
- stq t7, 0x80(sp)
- stq t8, 0x88(sp)
- stq t9, 0x90(sp)
- stq t10, 0x98(sp)
- stq t11, 0xa0(sp)
- stq v0, 0xa8(sp)
-
- jsr ra, __mcount
-
- ldq a0, 0x00(sp)
- ldq a1, 0x08(sp)
- ldq $at, 0x10(sp) # restore self-pc
- ldq a2, 0x18(sp)
- ldq a3, 0x20(sp)
- ldq a4, 0x28(sp)
- ldq a5, 0x30(sp)
- ldq ra, 0x38(sp)
- ldq gp, 0x40(sp)
- mov $at, pv # make pv point to return address
- ldq t0, 0x48(sp) # this is important under OSF/1 to
- ldq t1, 0x50(sp) # ensure that the code that we return
- ldq t2, 0x58(sp) # can correctly compute its gp
- ldq t3, 0x60(sp)
- ldq t4, 0x68(sp)
- ldq t5, 0x70(sp)
- ldq t6, 0x78(sp)
- ldq t7, 0x80(sp)
- ldq t8, 0x88(sp)
- ldq t9, 0x90(sp)
- ldq t10, 0x98(sp)
- ldq t11, 0xa0(sp)
- ldq v0, 0xa8(sp)
-
- addq sp, 0xb0, sp
- ret zero,($at),1
-
- END(_mcount)
-
-weak_alias (_mcount, mcount)