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ede7143386ce1cf086066eec06dbdf7cf6d4cfee
vpp/src/vppinfra/longjmp.S
Damjan Marion 53b8dc8bea vppinfra: OpenPOWER ELF V2 ABI version of clib_{longjmp,setjmp,calljmp} 
Type: improvement
Change-Id: Iea8e08dc18b72334f69af77c2753e900be6b97fb
Signed-off-by: Damjan Marion <damarion@cisco.com>
2020-05-18 21:28:31 +00:00

826 lines
18 KiB
ArmAsm
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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
Copyright (c) 2005 Eliot Dresselhaus
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#if defined(__APPLE__)
# define cdecl(s) _##s
#else
# define cdecl(s) s
#endif
#if defined(__x86_64__)
.global cdecl(clib_setjmp)
.align 4
#ifndef __APPLE__
.type cdecl(clib_setjmp), @function
#endif
cdecl(clib_setjmp):
movq %rbx, 8*0(%rdi)
movq %rbp, 8*1(%rdi)
movq %r12, 8*2(%rdi)
movq %r13, 8*3(%rdi)
movq %r14, 8*4(%rdi)
movq %r15, 8*5(%rdi)
/* Save SP after return. */
leaq 8(%rsp), %rdx
movq %rdx, 8*6(%rdi)
/* Save PC we are returning to from stack frame. */
movq 0(%rsp), %rax
movq %rax, 8*7(%rdi)
/* Give back user's return value. */
movq %rsi, %rax
ret
.global cdecl(clib_longjmp)
.align 4
#ifndef __APPLE__
.type cdecl(clib_longjmp), @function
#endif
cdecl(clib_longjmp):
/* Restore regs. */
movq 8*0(%rdi), %rbx
movq 8*1(%rdi), %rbp
movq 8*2(%rdi), %r12
movq 8*3(%rdi), %r13
movq 8*4(%rdi), %r14
movq 8*5(%rdi), %r15
movq 8*6(%rdi), %rsp
movq 8*7(%rdi), %rdx
/* Give back user's return value. */
movq %rsi, %rax
/* Away we go. */
jmpq *%rdx
.global cdecl(clib_calljmp)
.align 4
#ifndef __APPLE__
.type cdecl(clib_calljmp), @function
#endif
cdecl(clib_calljmp):
/* Make sure stack is 16-byte aligned. */
movq %rdx, %rax
andq $0xf, %rax
subq %rax, %rdx
/* Get return address. */
pop %rax
/* Switch to new stack. */
xchgq %rsp, %rdx
/* Save return address on new stack. */
push %rax
/* Save old stack pointer on new stack. */
push %rdx
/* Get function. */
movq %rdi, %rdx
/* Move argument into place. */
movq %rsi, %rdi
/* Away we go. */
callq *%rdx
/* Switch back to old stack. */
movq 8(%rsp), %rdx
movq 0(%rsp), %rcx
xchgq %rcx, %rsp
/* Return to caller. */
jmpq *%rdx
#elif defined(i386)
.global cdecl(clib_setjmp)
.align 4
.type cdecl(clib_setjmp), @function
cdecl(clib_setjmp):
movl 4(%esp), %ecx
movl %ebp, 4*0(%ecx)
movl %ebx, 4*1(%ecx)
movl %edi, 4*2(%ecx)
movl %esi, 4*3(%ecx)
/* Save SP after return. */
leal 4(%esp), %edx
movl %edx, 4*4(%ecx)
/* Save PC we are returning to from stack frame. */
movl 0(%esp), %eax
movl %eax, 4*5(%ecx)
/* Give back user's return value. */
movl 8(%esp), %eax
ret
.global cdecl(clib_longjmp)
.align 4
.type cdecl(clib_longjmp), @function
cdecl(clib_longjmp):
movl 4(%esp), %ecx
/* Give back user's return value. */
movl 8(%esp), %eax
/* Restore regs. */
movl 4*0(%ecx), %ebp
movl 4*1(%ecx), %ebx
movl 4*2(%ecx), %edi
movl 4*3(%ecx), %esi
movl 4*4(%ecx), %esp
movl 4*5(%ecx), %edx
/* Away we go. */
jmp *%edx
.global cdecl(clib_calljmp)
.align 4
.type cdecl(clib_calljmp), @function
cdecl(clib_calljmp):
/* Get new stack pointer. */
movl 12(%esp), %edx
/* Switch stacks. */
xchgl %esp, %edx
/* Save old stack pointer on new stack. */
sub $8, %esp
movl %edx, 4(%esp)
/* Put function argument in stack frame. */
movl 8(%edx), %eax
movl %eax, 0(%esp)
/* Get function. */
movl 4(%edx), %eax
/* Away we go. */
call *%eax
/* Switch back to old stack. */
movl 4(%esp), %edx
xchgl %edx, %esp
/* Return to caller. */
ret
#elif defined(__SPU__)
#elif defined(__powerpc64__)
#define _foreach_14_31 \
_ (14, 0) _ (15, 1) _ (16, 2) _ (17, 3) _ (18, 4) _ (19, 5) \
_ (20, 6) _ (21, 7) _ (22, 8) _ (23, 9) _ (24, 10) _ (25, 11) \
_ (26, 12) _ (27, 13) _ (28, 14) _ (29, 15) _ (30, 16) _ (31, 17)
#define _foreach_20_31 \
_ (20, 0) _ (21, 1) _ (22, 2) _ (23, 3) _ (24, 4) _ (25, 5) \
_ (26, 6) _ (27, 7) _ (28, 8) _ (29, 9) _ (30, 10) _ (31, 11)
#ifdef __ALTIVEC__
#define CLIB_POWERPC_ALTIVEC_N_REGS 12
#else
#define CLIB_POWERPC_ALTIVEC_N_REGS 0
#endif
#if _CALL_ELF == 2
#define _prologue(n) \
.globl n ; \
.p2align 4 ; \
.type n, @function ; \
n: ; \
.L##n##_begin: ;
#define _gep_lep(n) \
.L##n##_gep: ; \
addis 2, 12, .TOC.-.L##n##_gep@ha ; \
addi 2, 2, .TOC.-.L##n##_gep@l ; \
.L##n##_lep: ; \
.localentry n, .L##n##_lep-.L##n##_gep
#else /* _CALL_ELF == 1 */
#define _prologue(n) \
.globl n ; \
.p2align 4 ; \
.type .##n, @function ; \
.section ".opd", "aw" ,@progbits ; \
n: ; \
.p2align 3 ; \
.quad .L##n##_begin ; \
.quad .TOC.@tocbase ; \
.quad 0 ; \
.text ; \
.L##n##_begin: ;
#endif
#define _epilogue(n) \
.long 0 ; \
.quad 0 ; \
.L##n##_end: ; \
.size n, .L##n##_end-.L##n##_begin
#if _CALL_ELF == 2
.abiversion 2
.section ".text"
#else
.text
#endif
_prologue(clib_setjmp)
mflr 0
std 0, 8*0(3)
std 1, 8*1(3)
std 2, 8*2(3)
mfcr 0
std 0, 8*3(3)
mfspr 0, 256
stw 0, 8*4(3)
/* gprs 14 - 31 */
#define _(a,b) std a, 8*((b) + 4 + 18*0)(3) ;
_foreach_14_31
#undef _
/* fprs 14 - 31 */
#define _(a,b) stfd a, 8*((b) + 4 + 18*1)(3) ;
_foreach_14_31
#undef _
#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
/* vrs 20 - 31 */
li 5, 8*(4 + 18*2)
#define _(a,b) stvx a, 5, 3 ; addi 5, 5, 16 ;
_foreach_20_31
#undef _
#endif /* CLIB_POWERPC_ALTIVEC_N_REGS > 0 */
/* Return value. */
mr 3, 4
blr
_epilogue(clib_setjmp)
_prologue(clib_longjmp)
ld 0, 8*0(3)
mtlr 0
ld 1, 8*1(3)
ld 2, 8*2(3)
ld 0, 8*3(3)
mtcrf 0xff, 0
lwz 0, 8*3(3)
mtspr 256, 0
/* gprs 14 - 31 */
#define _(a,b) ld a, 8*((b) + 4 + 18*0)(3) ;
_foreach_14_31
#undef _
/* fprs 14 - 31 */
#define _(a,b) lfd a, 8*((b) + 4 + 18*1)(3) ;
_foreach_14_31
#undef _
#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
/* vrs 20 - 31 */
li 5, 8*(4 + 18*2)
#define _(a,b) lvx a, 5, 3 ; addi 5, 5, 16 ;
_foreach_20_31
#undef _
#endif /* CLIB_POWERPC_ALTIVEC_N_REGS > 0 */
/* Return value. */
mr 3, 4
blr
_epilogue(clib_longjmp)
#if _CALL_ELF == 2
_prologue(clib_calljmp)
_gep_lep(clib_calljmp)
mflr 0 /* get link register into r0 */
std 0,16(1) /* store r0 into the stack frame */
stdu 1,-32(1) /* move sp down for one frame */
mr 12,3 /* move func pointer to r12 */
mr 3,4 /* pass func_arg as first arg */
std 1,-8(5) /* store old sp into the top of the new stack */
addi 5,5,-256 /* stack_addr =- 256 */
mr 1,5 /* set new sp */
mtctr 12 /* put function pointer into CTR register */
std 2,24(1) /* store TOC pointer into stack frame */
bctrl /* unconditional branch to counter register */
ld 2,24(1) /* load TOC pointer from stack frame */
addi 1,1,256 /* go back to the start of the new stack */
ld 1,-8(1) /* load old sp */
addi 1,1,32 /* move sp back to previous frame */
ld 0,16(1) /* get old link reg value from the stack */
mtlr 0 /* restore link reg value */
blr
_epilogue(clib_calljmp)
#else /* v1 ABI */
_prologue(clib_calljmp)
mflr 0 /* get link register into r0 */
mr 9,3 /* store function pointer into the r9 */
std 0,16(1) /* store r0 into the stack frame */
stdu 1,-112(1) /* move sp down for one frame */
std 1,-8(5) /* store old sp into the top of the new stack */
addi 5,5,-256 /* stack_addr =- 256 */
mr 1,5 /* set new sp */
ld 10,0(9)
std 2,40(1) /* store TOC pointer into the stack */
mr 3,4
mtctr 10
ld 11,16(9)
ld 2,8(9)
bctrl /* unconditional branch to counter register */
ld 2,40(1) /* load TOC pointer from the stack */
addi 1,1,256 /* go back to the start of the new stack */
ld 1,-8(1) /* load the old sp */
addi 1,1,112 /* move sp back to previous frame */
ld 0,16(1) /* restore link register from the stack frame */
mtlr 0
blr
_epilogue(clib_calljmp)
#endif
#elif defined(__powerpc__)
#define _foreach_14_31 \
_ (14, 0) _ (15, 1) _ (16, 2) _ (17, 3) _ (18, 4) _ (19, 5) \
_ (20, 6) _ (21, 7) _ (22, 8) _ (23, 9) _ (24, 10) _ (25, 11) \
_ (26, 12) _ (27, 13) _ (28, 14) _ (29, 15) _ (30, 16) _ (31, 17)
#define _foreach_20_31 \
_ (20, 0) _ (21, 1) _ (22, 2) _ (23, 3) _ (24, 4) _ (25, 5) \
_ (26, 6) _ (27, 7) _ (28, 8) _ (29, 9) _ (30, 10) _ (31, 11)
#ifdef __ALTIVEC__
#define CLIB_POWERPC_ALTIVEC_N_REGS 12
#else
#define CLIB_POWERPC_ALTIVEC_N_REGS 0
#endif
.global cdecl(clib_setjmp)
.align 4
.type cdecl(clib_setjmp), @function
cdecl(clib_setjmp):
mflr 0
stw 0, 4*0(3)
stw 1, 4*1(3)
mfcr 0
stw 0, 4*2(3)
#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
mfspr 0, 256
#endif
stw 0, 4*3(3)
#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
li 5, 4*4
#define _(a,b) stvx a, 3, 5 ; addi 5, 5, 16 ;
_foreach_20_31
#undef _
#endif /* CLIB_POWERPC_ALTIVEC_N_REGS > 0 */
/* gp 14 - 31 */
#define _(a,b) stw a, 4*(1*(b) + 4 + 4*CLIB_POWERPC_ALTIVEC_N_REGS + 0*18)(3) ;
_foreach_14_31
#undef _
/* fp 14 - 31 */
#define _(a,b) stfd a, 4*(2*(b) + 4 + 4*CLIB_POWERPC_ALTIVEC_N_REGS + 1*18)(3) ;
_foreach_14_31
#undef _
/* Return value. */
mr 3, 4
blr
.global cdecl(clib_longjmp)
.align 4
.type cdecl(clib_longjmp), @function
cdecl(clib_longjmp):
lwz 0, 4*0(3)
mtlr 0
lwz 1, 4*1(3)
lwz 0, 4*2(3)
mtcr 0
lwz 0, 4*3(3)
#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
mtspr 256, 0
#endif
#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
li 5, 4*4
#define _(a,b) lvx a, 3, 5 ; addi 5, 5, 16 ;
_foreach_20_31
#undef _
#endif /* CLIB_POWERPC_ALTIVEC_N_REGS > 0 */
/* gp 14 - 31 */
#define _(a,b) lwz a, 4*(1*(b) + 4 + 4*CLIB_POWERPC_ALTIVEC_N_REGS + 0*18)(3) ;
_foreach_14_31
#undef _
/* fp 14 - 31 */
#define _(a,b) lfd a, 4*(2*(b) + 4 + 4*CLIB_POWERPC_ALTIVEC_N_REGS + 1*18)(3) ;
_foreach_14_31
#undef _
/* Return value. */
mr 3, 4
blr
.global cdecl(clib_calljmp)
.align 4
.type cdecl(clib_calljmp), @function
cdecl(clib_calljmp):
/* Make sure stack is 16 byte aligned. */
andi. 0, 5, 0xf
sub 5, 5, 0
addi 5, 5, -16
/* Save old stack/link pointer on new stack. */
stw 1, 0(5)
mflr 0
stw 0, 4(5)
/* account for (sp, lr) tuple, and keep aligned */
addi 5, 5, -16
/* Switch stacks. */
mr 1, 5
/* Move argument into place. */
mtctr 3
mr 3, 4
/* Away we go. */
bctrl
/* back to our synthetic frame */
addi 1,1,16
/* Switch back to old stack. */
lwz 0, 4(1)
mtlr 0
lwz 0, 0(1)
mr 1, 0
/* Return to caller. */
blr
#elif defined(__arm__)
.global cdecl(clib_setjmp)
.align 4
.type cdecl(clib_setjmp), %function
cdecl(clib_setjmp):
mov ip, r0 /* jmp buffer */
/* Save integer registers */
stmia ip!, {v1-v6, sl, fp, sp, lr}
#ifdef __IWMMXT__
/* Save the call-preserved iWMMXt registers. */
wstrd wr10, [ip], #8
wstrd wr11, [ip], #8
wstrd wr12, [ip], #8
wstrd wr13, [ip], #8
wstrd wr14, [ip], #8
wstrd wr15, [ip], #8
#endif
/* Give back user's return value. */
mov r0, r1
bx lr
.global cdecl(clib_longjmp)
.align 4
.type cdecl(clib_longjmp), %function
cdecl(clib_longjmp):
mov ip, r0 /* jmp buffer */
/* Restore integer registers. */
ldmia ip!, {v1-v6, sl, fp, sp, lr}
#ifdef __IWMMXT__
/* Save the call-preserved iWMMXt registers. */
wldrd wr10, [ip], #8
wldrd wr11, [ip], #8
wldrd wr12, [ip], #8
wldrd wr13, [ip], #8
wldrd wr14, [ip], #8
wldrd wr15, [ip], #8
#endif
/* Give back user's return value. */
mov r0, r1
bx lr
.global cdecl(clib_calljmp)
.align 4
.type cdecl(clib_calljmp), %function
cdecl(clib_calljmp):
/* Make sure stack is 8 byte aligned. */
bic r2, r2, #7
/* Allocate space for stack/link pointer on new stack. */
sub r2, r2, #8
/* Save old stack/link pointer on new stack. */
str sp, [r2, #0]
str lr, [r2, #4]
/* Switch stacks. */
mov sp, r2
/* Save function to call. */
mov ip, r0
/* Move argument into place. */
mov r0, r1
/* Away we go. */
bx ip
/* Switch back to old stack. */
ldr lr, [sp, #4]
ldr ip, [sp, #0]
mov sp, ip
/* Return to caller. */
bx lr
#elif defined(__xtensa__)
/* FIXME implement if needed. */
.global cdecl(clib_setjmp)
.align 4
.type cdecl(clib_setjmp), %function
cdecl(clib_setjmp):
1: j 1b
.global cdecl(clib_longjmp)
.align 4
.type cdecl(clib_longjmp), @function
cdecl(clib_longjmp):
1: j 1b
.global cdecl(clib_calljmp)
.align 4
.type cdecl(clib_calljmp), %function
cdecl(clib_calljmp):
1: j 1b
#elif defined(__TMS320C6X__)
/* FIXME implement if needed. */
.global cdecl(clib_setjmp)
.align 4
.type cdecl(clib_setjmp), %function
cdecl(clib_setjmp):
1: B .S1 1b
.global cdecl(clib_longjmp)
.align 4
.type cdecl(clib_longjmp), @function
cdecl(clib_longjmp):
1: B .S1 1b
.global cdecl(clib_calljmp)
.align 4
.type cdecl(clib_calljmp), %function
cdecl(clib_calljmp):
1: B .S1 1b
#elif defined(_mips) && __mips == 64
.global cdecl(clib_setjmp)
.align 8
.type cdecl(clib_setjmp), %function
cdecl(clib_setjmp):
sd $ra, 0($a0)
sd $sp, 8($a0)
sd $gp, 16($a0)
sd $16, 24($a0)
sd $17, 32($a0)
sd $18, 40($a0)
sd $19, 48($a0)
sd $20, 56($a0)
sd $21, 64($a0)
sd $22, 72($a0)
sd $23, 80($a0)
sd $30, 88($a0)
move $v0, $a1
jr $ra
nop
.global cdecl(clib_longjmp)
.align 8
.type cdecl(clib_longjmp), @function
cdecl(clib_longjmp):
move $v0, $a1
bne $v0, $0, 1f
nop
daddu $v0, $v0, 1
1:
ld $ra, 0($a0)
ld $sp, 8($a0)
ld $gp, 16($a0)
ld $16, 24($a0)
ld $17, 32($a0)
ld $18, 40($a0)
ld $19, 48($a0)
ld $20, 56($a0)
ld $21, 64($a0)
ld $22, 72($a0)
ld $23, 80($a0)
ld $30, 88($a0)
jr $ra
nop
.global cdecl(clib_calljmp)
.align 8
.type cdecl(clib_calljmp), %function
cdecl(clib_calljmp):
/* Force 16 byte alignment of the new stack */
li $t1, -16
and $t0, $a2, $t1
/* Save old ra/gp/sp on new stack */
daddiu $t0, $t0, (-24)
sd $ra, 0($t0)
sd $gp, 8($t0)
sd $sp, 16($t0)
/* Switch stacks */
move $sp, $t0
/* Away we go */
move $t9, $a0
move $a0, $a1
jalr $t9
nop
/* Switch back to old ra/gp/sp */
move $t0, $sp
ld $ra, 0($t0)
ld $gp, 8($t0)
ld $sp, 16($t0)
/* Return to caller */
jr $ra
nop
#elif defined (__aarch64__)
/*
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 cdecl(clib_setjmp) (jmp_buf)
.global cdecl(clib_setjmp)
.type cdecl(clib_setjmp), %function
cdecl(clib_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 x0, x1
ret
.size cdecl(clib_setjmp), .-cdecl(clib_setjmp)
// void cdecl(clib_longjmp) (jmp_buf, int) __attribute__ ((noreturn))
.global cdecl(clib_longjmp)
.type cdecl(clib_longjmp), %function
cdecl(clib_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
mov x0, x1
// cmp w1, #0
// cinc w0, w1, eq
// use br not ret, as ret is guaranteed to mispredict
br x30
.size cdecl(clib_longjmp), .-cdecl(clib_longjmp)
// void cdecl(clib_calljmp) (x0=function, x1=arg, x2=new_stack)
.global cdecl(clib_calljmp)
.type cdecl(clib_calljmp), %function
cdecl(clib_calljmp):
// save fn ptr
mov x3, x0
// set up fn arg
mov x0, x1
// switch stacks
mov x4, sp
// space for saved sp, lr on new stack
sub x2, x2, #16
mov sp, x2
// save old sp and link register on new stack
str x4, [sp]
str x30,[sp,#8]
mov x4, sp
// go there
blr x3
// restore old sp and link register
mov x4, sp
ldr x3, [x4]
ldr x30,[x4, #8]
mov sp, x3
ret
.size cdecl(clib_calljmp), .-cdecl(clib_calljmp)
#else
#error "unknown machine"
#endif
#ifndef __APPLE__
.section .note.GNU-stack,"",%progbits
#endif
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