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Diffstat (limited to 'sysdeps/ia64/_mcount.S')
| -rw-r--r-- | sysdeps/ia64/_mcount.S | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/sysdeps/ia64/_mcount.S b/sysdeps/ia64/_mcount.S new file mode 100644 index 0000000000..e009833e4a --- /dev/null +++ b/sysdeps/ia64/_mcount.S @@ -0,0 +1,91 @@ +/* Machine-specific calling sequence for `mcount' profiling function. ia64 + Copyright (C) 2000-2014 Free Software Foundation, Inc. + Contributed by David Mosberger <davidm@hpl.hp.com> + 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 before executing a function's prologue and without saving + any registers. It is therefore necessary to preserve the input + registers as they may contain function arguments. To work + correctly with frame-less functions, it is also necessary to + preserve the return pointer (b0 aka rp). + + State upon entering _mcount: + + r8 address of return value structure (used only when called + function returns a large structure) + r15 static link (used only for nested functions) + in0 ar.pfs to restore before returning to the function that + called _mcount + in1 gp value to restore before returning to the function that + called _mcount + in2 return address in the function that invoked the caller + of _mcount (frompc) + in3 address of the global-offset table entry that holds the + profile count dword allocated by the compiler; to get + the address of this dword, use "ld8 in2=[in2]; this + dword can be used in any way by _mcount (including + not at all, as is the case with the current implementation) + b0 address to return to after _mcount is done +*/ + +#include <sysdep.h> + +#undef ret + +LEAF(_mcount) + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4) + alloc loc1 = ar.pfs, 4, 4, 3, 0 + mov loc0 = rp + .body + mov loc2 = r8 // gcc uses r8 to pass pointer to return structure + ;; + mov loc3 = r15 // gcc uses r15 to pass the static link to nested functions + mov out0 = in2 + mov out1 = rp + br.call.sptk.few rp = __mcount + ;; +.here: +{ + .mii + mov gp = in1 + mov r2 = ip + mov ar.pfs = loc1 +} + ;; + adds r2 = _mcount_ret_helper - .here, r2 + mov b7 = loc0 + mov rp = in2 + ;; + mov r3 = in0 + mov r8 = loc2 + mov r15 = loc3 + mov b6 = r2 + br.ret.sptk.few b6 +END(_mcount) + +LOCAL_LEAF(_mcount_ret_helper) + .prologue + .altrp b7 + .save ar.pfs, r3 + .body + alloc r2 = ar.pfs, 0, 0, 8, 0 + mov ar.pfs = r3 + br b7 +END(_mcount_ret_helper) + +weak_alias (_mcount, mcount) |