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Diffstat (limited to 'sysdeps/alpha/_mcount.S')
| -rw-r--r-- | sysdeps/alpha/_mcount.S | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/sysdeps/alpha/_mcount.S b/sysdeps/alpha/_mcount.S new file mode 100644 index 0000000000..f61287557b --- /dev/null +++ b/sysdeps/alpha/_mcount.S @@ -0,0 +1,105 @@ +/* Machine-specific calling sequence for `mcount' profiling function. alpha + Copyright (C) 1995-2014 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, see + <http://www.gnu.org/licenses/>. */ + +/* 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) + subq sp, 0xb0, sp + .prologue 0 + 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) |