newlib-cygwin/newlib/libc/machine/aarch64/setjmp.S

75 lines
2.5 KiB
ArmAsm

/*
Copyright (c) 2011, 2012 ARM Ltd
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the company may not be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define GPR_LAYOUT \
REG_PAIR (x19, x20, 0); \
REG_PAIR (x21, x22, 16); \
REG_PAIR (x23, x24, 32); \
REG_PAIR (x25, x26, 48); \
REG_PAIR (x27, x28, 64); \
REG_PAIR (x29, x30, 80); \
REG_ONE (x16, 96)
#define FPR_LAYOUT \
REG_PAIR ( d8, d9, 112); \
REG_PAIR (d10, d11, 128); \
REG_PAIR (d12, d13, 144); \
REG_PAIR (d14, d15, 160);
// int setjmp (jmp_buf)
.global setjmp
.type setjmp, %function
setjmp:
mov x16, sp
#define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]
#define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]
GPR_LAYOUT
FPR_LAYOUT
#undef REG_PAIR
#undef REG_ONE
mov w0, #0
ret
.size setjmp, .-setjmp
// void longjmp (jmp_buf, int) __attribute__ ((noreturn))
.global longjmp
.type longjmp, %function
longjmp:
#define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]
#define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]
GPR_LAYOUT
FPR_LAYOUT
#undef REG_PAIR
#undef REG_ONE
mov sp, x16
cmp w1, #0
cinc w0, w1, eq
// use br not ret, as ret is guaranteed to mispredict
br x30
.size longjmp, .-longjmp