src/vppinfra/longjmp.S - fdio/vpp - Gitiles

 /*
  * 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(__x86_64__)
 	.global clib_setjmp
 	.align 4
 	.type clib_setjmp, @function
 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 clib_longjmp
 	.align 4
 	.type clib_longjmp, @function
 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 clib_calljmp
 	.align 4
 	.type clib_calljmp, @function
 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 clib_setjmp
 	.align 4
 	.type clib_setjmp, @function
 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 clib_longjmp
 	.align 4
 	.type clib_longjmp, @function
 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 clib_calljmp
 	.align 4
 	.type clib_calljmp, @function
 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__)

 	.text

 #define _prologue(n)				\
     .align 2 ;					\
     .globl n, .##n ;				\
     .section ".opd", "aw" ;			\
     .align 3 ;					\
 n:  .quad .##n, .TOC.@tocbase, 0 ;		\
     .previous ;					\
     .size n, 24 ;				\
     .type .##n, @function ;			\
 .##n:

 #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

 _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

 _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

 	.globl clib_calljmp
 	.section	".opd","aw"
 	.align 3
 clib_calljmp:
 	.quad	.L.clib_calljmp,.TOC.@tocbase,0
 	.previous
 	.type	clib_calljmp, @function
 .L.clib_calljmp:
 	mflr 0
 	mr 9,3
 	std 0,16(1)
 	stdu 1,-112(1)
 #APP
 	std 1,-8(5)
 	addi 5,5,-256
 	mr 1,5
 #NO_APP
 	ld 10,0(9)
 	std 2,40(1)
 	mr 3,4
 	mtctr 10
 	ld 11,16(9)
 	ld 2,8(9)
 	bctrl
 	ld 2,40(1)
 #APP
 	addi 1,1,256
 	ld 1,-8(1)
 #NO_APP
 	addi 1,1,112
 	ld 0,16(1)
 	mtlr 0
 	blr
 	.long 0
 	.byte 0,0,0,1,128,0,0,0
 	.size	clib_calljmp,.-.L.clib_calljmp

 #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 clib_setjmp
 	.align 4
 	.type clib_setjmp, @function
 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 clib_longjmp
 	.align 4
 	.type clib_longjmp, @function
 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 clib_calljmp
 	.align 4
 	.type clib_calljmp, @function
 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 clib_setjmp
 	.align 4
 	.type clib_setjmp, %function
 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 clib_longjmp
 	.align 4
 	.type clib_longjmp, %function
 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 clib_calljmp
 	.align 4
 	.type clib_calljmp, %function
 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 clib_setjmp
 	.align 4
 	.type clib_setjmp, %function
 clib_setjmp:
 1:	j 1b

 	.global clib_longjmp
 	.align 4
 	.type clib_longjmp, @function
 clib_longjmp:
 1:	j 1b

 	.global clib_calljmp
 	.align 4
 	.type clib_calljmp, %function
 clib_calljmp:
 1:	j 1b

 #elif defined(__TMS320C6X__)

 	/* FIXME implement if needed. */
 	.global clib_setjmp
 	.align 4
 	.type clib_setjmp, %function
 clib_setjmp:
 1:	B	.S1     1b

 	.global clib_longjmp
 	.align 4
 	.type clib_longjmp, @function
 clib_longjmp:
 1:	B	.S1     1b

 	.global clib_calljmp
 	.align 4
 	.type clib_calljmp, %function
 clib_calljmp:
 1:	B	.S1     1b

 #elif defined(_mips) && __mips == 64

 	.global clib_setjmp
 	.align 8
 	.type clib_setjmp, %function
 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 clib_longjmp
 	.align 8
 	.type clib_longjmp, @function
 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 clib_calljmp
 	.align 8
 	.type clib_calljmp, %function
 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 clib_setjmp (jmp_buf)
 	.global	clib_setjmp
 	.type	clib_setjmp, %function
 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	clib_setjmp, .-clib_setjmp
 // void clib_longjmp (jmp_buf, int) __attribute__ ((noreturn))
 	.global	clib_longjmp
 	.type	clib_longjmp, %function
 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	clib_longjmp, .-clib_longjmp


 // void clib_calljmp (x0=function, x1=arg, x2=new_stack)
 	.global	clib_calljmp
 	.type	clib_calljmp, %function
 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	clib_calljmp, .-clib_calljmp
 #else
 #error "unknown machine"
 #endif

 .section .note.GNU-stack,"",%progbits
	/*
	* 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(__x86_64__)
	.global clib_setjmp
	.align 4
	.type clib_setjmp, @function
	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 clib_longjmp
	.align 4
	.type clib_longjmp, @function
	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 clib_calljmp
	.align 4
	.type clib_calljmp, @function
	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 clib_setjmp
	.align 4
	.type clib_setjmp, @function
	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 clib_longjmp
	.align 4
	.type clib_longjmp, @function
	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 clib_calljmp
	.align 4
	.type clib_calljmp, @function
	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__)

	.text

	#define _prologue(n) \
	.align 2 ; \
	.globl n, .##n ; \
	.section ".opd", "aw" ; \
	.align 3 ; \
	n: .quad .##n, .TOC.@tocbase, 0 ; \
	.previous ; \
	.size n, 24 ; \
	.type .##n, @function ; \
	.##n:

	#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

	_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 + 180)(3) ;
	_foreach_14_31
	#undef _

	/* fprs 14 - 31 */
	#define _(a,b) stfd a, 8((b) + 4 + 181)(3) ;
	_foreach_14_31
	#undef _

	#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
	/* vrs 20 - 31 */
	li 5, 8(4 + 182)
	#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

	_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 + 180)(3) ;
	_foreach_14_31
	#undef _

	/* fprs 14 - 31 */
	#define _(a,b) lfd a, 8((b) + 4 + 181)(3) ;
	_foreach_14_31
	#undef _

	#if CLIB_POWERPC_ALTIVEC_N_REGS > 0
	/* vrs 20 - 31 */
	li 5, 8(4 + 182)
	#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

	.globl clib_calljmp
	.section ".opd","aw"
	.align 3
	clib_calljmp:
	.quad .L.clib_calljmp,.TOC.@tocbase,0
	.previous
	.type clib_calljmp, @function
	.L.clib_calljmp:
	mflr 0
	mr 9,3
	std 0,16(1)
	stdu 1,-112(1)
	#APP
	std 1,-8(5)
	addi 5,5,-256
	mr 1,5
	#NO_APP
	ld 10,0(9)
	std 2,40(1)
	mr 3,4
	mtctr 10
	ld 11,16(9)
	ld 2,8(9)
	bctrl
	ld 2,40(1)
	#APP
	addi 1,1,256
	ld 1,-8(1)
	#NO_APP
	addi 1,1,112
	ld 0,16(1)
	mtlr 0
	blr
	.long 0
	.byte 0,0,0,1,128,0,0,0
	.size clib_calljmp,.-.L.clib_calljmp

	#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 clib_setjmp
	.align 4
	.type clib_setjmp, @function
	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 + 4CLIB_POWERPC_ALTIVEC_N_REGS + 018)(3) ;
	_foreach_14_31
	#undef _

	/* fp 14 - 31 */
	#define _(a,b) stfd a, 4(2(b) + 4 + 4CLIB_POWERPC_ALTIVEC_N_REGS + 118)(3) ;
	_foreach_14_31
	#undef _

	/* Return value. */
	mr 3, 4

	blr

	.global clib_longjmp
	.align 4
	.type clib_longjmp, @function
	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 + 4CLIB_POWERPC_ALTIVEC_N_REGS + 018)(3) ;
	_foreach_14_31
	#undef _

	/* fp 14 - 31 */
	#define _(a,b) lfd a, 4(2(b) + 4 + 4CLIB_POWERPC_ALTIVEC_N_REGS + 118)(3) ;
	_foreach_14_31
	#undef _

	/* Return value. */
	mr 3, 4

	blr

	.global clib_calljmp
	.align 4
	.type clib_calljmp, @function
	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 clib_setjmp
	.align 4
	.type clib_setjmp, %function
	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 clib_longjmp
	.align 4
	.type clib_longjmp, %function
	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 clib_calljmp
	.align 4
	.type clib_calljmp, %function
	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 clib_setjmp
	.align 4
	.type clib_setjmp, %function
	clib_setjmp:
	1: j 1b

	.global clib_longjmp
	.align 4
	.type clib_longjmp, @function
	clib_longjmp:
	1: j 1b

	.global clib_calljmp
	.align 4
	.type clib_calljmp, %function
	clib_calljmp:
	1: j 1b

	#elif defined(__TMS320C6X__)

	/* FIXME implement if needed. */
	.global clib_setjmp
	.align 4
	.type clib_setjmp, %function
	clib_setjmp:
	1: B .S1 1b

	.global clib_longjmp
	.align 4
	.type clib_longjmp, @function
	clib_longjmp:
	1: B .S1 1b

	.global clib_calljmp
	.align 4
	.type clib_calljmp, %function
	clib_calljmp:
	1: B .S1 1b

	#elif defined(_mips) && __mips == 64

	.global clib_setjmp
	.align 8
	.type clib_setjmp, %function
	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 clib_longjmp
	.align 8
	.type clib_longjmp, @function
	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 clib_calljmp
	.align 8
	.type clib_calljmp, %function
	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 clib_setjmp (jmp_buf)
	.global clib_setjmp
	.type clib_setjmp, %function
	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 clib_setjmp, .-clib_setjmp
	// void clib_longjmp (jmp_buf, int) __attribute__ ((noreturn))
	.global clib_longjmp
	.type clib_longjmp, %function
	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 clib_longjmp, .-clib_longjmp


	// void clib_calljmp (x0=function, x1=arg, x2=new_stack)
	.global clib_calljmp
	.type clib_calljmp, %function
	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 clib_calljmp, .-clib_calljmp
	#else
	#error "unknown machine"
	#endif

	.section .note.GNU-stack,"",%progbits