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asm.S
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asm.S
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/* Copyright (c) 2005-2006 Russ Cox, MIT; see COPYRIGHT */
#if defined(__FreeBSD__) && defined(__i386__) && __FreeBSD__ < 5
#define NEEDX86CONTEXT 1
#define SET setmcontext
#define GET getmcontext
#endif
#if defined(__OpenBSD__) && defined(__i386__)
#define NEEDX86CONTEXT 1
#define SET setmcontext
#define GET getmcontext
#endif
#if defined(__APPLE__)
#if defined(__i386__)
#define NEEDX86CONTEXT 1
#define SET _setmcontext
#define GET _getmcontext
#elif defined(__x86_64__)
#define NEEDAMD64CONTEXT 1
#define SET _setmcontext
#define GET _getmcontext
#else
#define NEEDPOWERCONTEXT 1
#define SET __setmcontext
#define GET __getmcontext
#endif
#endif
#if defined(__linux__) && defined(__arm__)
#define NEEDARMCONTEXT 1
#define SET setmcontext
#define GET getmcontext
#endif
#if defined(__linux__) && defined(__mips__)
#define NEEDMIPSCONTEXT 1
#define SET setmcontext
#define GET getmcontext
#endif
#ifdef NEEDX86CONTEXT
.globl SET
SET:
movl 4(%esp), %eax
movl 8(%eax), %fs
movl 12(%eax), %es
movl 16(%eax), %ds
movl 76(%eax), %ss
movl 20(%eax), %edi
movl 24(%eax), %esi
movl 28(%eax), %ebp
movl 36(%eax), %ebx
movl 40(%eax), %edx
movl 44(%eax), %ecx
movl 72(%eax), %esp
pushl 60(%eax) /* new %eip */
movl 48(%eax), %eax
ret
.globl GET
GET:
movl 4(%esp), %eax
movl %fs, 8(%eax)
movl %es, 12(%eax)
movl %ds, 16(%eax)
movl %ss, 76(%eax)
movl %edi, 20(%eax)
movl %esi, 24(%eax)
movl %ebp, 28(%eax)
movl %ebx, 36(%eax)
movl %edx, 40(%eax)
movl %ecx, 44(%eax)
movl $1, 48(%eax) /* %eax */
movl (%esp), %ecx /* %eip */
movl %ecx, 60(%eax)
leal 4(%esp), %ecx /* %esp */
movl %ecx, 72(%eax)
movl 44(%eax), %ecx /* restore %ecx */
movl $0, %eax
ret
#endif
#ifdef NEEDAMD64CONTEXT
.globl SET
SET:
movq 16(%rdi), %rsi
movq 24(%rdi), %rdx
movq 32(%rdi), %rcx
movq 40(%rdi), %r8
movq 48(%rdi), %r9
movq 56(%rdi), %rax
movq 64(%rdi), %rbx
movq 72(%rdi), %rbp
movq 80(%rdi), %r10
movq 88(%rdi), %r11
movq 96(%rdi), %r12
movq 104(%rdi), %r13
movq 112(%rdi), %r14
movq 120(%rdi), %r15
movq 184(%rdi), %rsp
pushq 160(%rdi) /* new %eip */
movq 8(%rdi), %rdi
ret
.globl GET
GET:
movq %rdi, 8(%rdi)
movq %rsi, 16(%rdi)
movq %rdx, 24(%rdi)
movq %rcx, 32(%rdi)
movq %r8, 40(%rdi)
movq %r9, 48(%rdi)
movq $1, 56(%rdi) /* %rax */
movq %rbx, 64(%rdi)
movq %rbp, 72(%rdi)
movq %r10, 80(%rdi)
movq %r11, 88(%rdi)
movq %r12, 96(%rdi)
movq %r13, 104(%rdi)
movq %r14, 112(%rdi)
movq %r15, 120(%rdi)
movq (%rsp), %rcx /* %rip */
movq %rcx, 160(%rdi)
leaq 8(%rsp), %rcx /* %rsp */
movq %rcx, 184(%rdi)
movq 32(%rdi), %rcx /* restore %rcx */
movq $0, %rax
ret
#endif
#ifdef NEEDPOWERCONTEXT
/* get FPR and VR use flags with sc 0x7FF3 */
/* get vsave with mfspr reg, 256 */
.text
.align 2
.globl GET
GET: /* xxx: instruction scheduling */
mflr r0
mfcr r5
mfctr r6
mfxer r7
stw r0, 0*4(r3)
stw r5, 1*4(r3)
stw r6, 2*4(r3)
stw r7, 3*4(r3)
stw r1, 4*4(r3)
stw r2, 5*4(r3)
li r5, 1 /* return value for setmcontext */
stw r5, 6*4(r3)
stw r13, (0+7)*4(r3) /* callee-save GPRs */
stw r14, (1+7)*4(r3) /* xxx: block move */
stw r15, (2+7)*4(r3)
stw r16, (3+7)*4(r3)
stw r17, (4+7)*4(r3)
stw r18, (5+7)*4(r3)
stw r19, (6+7)*4(r3)
stw r20, (7+7)*4(r3)
stw r21, (8+7)*4(r3)
stw r22, (9+7)*4(r3)
stw r23, (10+7)*4(r3)
stw r24, (11+7)*4(r3)
stw r25, (12+7)*4(r3)
stw r26, (13+7)*4(r3)
stw r27, (14+7)*4(r3)
stw r28, (15+7)*4(r3)
stw r29, (16+7)*4(r3)
stw r30, (17+7)*4(r3)
stw r31, (18+7)*4(r3)
li r3, 0 /* return */
blr
.globl SET
SET:
lwz r13, (0+7)*4(r3) /* callee-save GPRs */
lwz r14, (1+7)*4(r3) /* xxx: block move */
lwz r15, (2+7)*4(r3)
lwz r16, (3+7)*4(r3)
lwz r17, (4+7)*4(r3)
lwz r18, (5+7)*4(r3)
lwz r19, (6+7)*4(r3)
lwz r20, (7+7)*4(r3)
lwz r21, (8+7)*4(r3)
lwz r22, (9+7)*4(r3)
lwz r23, (10+7)*4(r3)
lwz r24, (11+7)*4(r3)
lwz r25, (12+7)*4(r3)
lwz r26, (13+7)*4(r3)
lwz r27, (14+7)*4(r3)
lwz r28, (15+7)*4(r3)
lwz r29, (16+7)*4(r3)
lwz r30, (17+7)*4(r3)
lwz r31, (18+7)*4(r3)
lwz r1, 4*4(r3)
lwz r2, 5*4(r3)
lwz r0, 0*4(r3)
mtlr r0
lwz r0, 1*4(r3)
mtcr r0 /* mtcrf 0xFF, r0 */
lwz r0, 2*4(r3)
mtctr r0
lwz r0, 3*4(r3)
mtxer r0
lwz r3, 6*4(r3)
blr
#endif
#ifdef NEEDARMCONTEXT
.globl GET
GET:
str r1, [r0,#4]
str r2, [r0,#8]
str r3, [r0,#12]
str r4, [r0,#16]
str r5, [r0,#20]
str r6, [r0,#24]
str r7, [r0,#28]
str r8, [r0,#32]
str r9, [r0,#36]
str r10, [r0,#40]
str r11, [r0,#44]
str r12, [r0,#48]
str r13, [r0,#52]
str r14, [r0,#56]
/* store 1 as r0-to-restore */
mov r1, #1
str r1, [r0]
/* return 0 */
mov r0, #0
mov pc, lr
.globl SET
SET:
ldr r1, [r0,#4]
ldr r2, [r0,#8]
ldr r3, [r0,#12]
ldr r4, [r0,#16]
ldr r5, [r0,#20]
ldr r6, [r0,#24]
ldr r7, [r0,#28]
ldr r8, [r0,#32]
ldr r9, [r0,#36]
ldr r10, [r0,#40]
ldr r11, [r0,#44]
ldr r12, [r0,#48]
ldr r13, [r0,#52]
ldr r14, [r0,#56]
ldr r0, [r0]
mov pc, lr
#endif
#ifdef NEEDMIPSCONTEXT
.globl GET
GET:
sw $4, 24($4)
sw $5, 28($4)
sw $6, 32($4)
sw $7, 36($4)
sw $16, 72($4)
sw $17, 76($4)
sw $18, 80($4)
sw $19, 84($4)
sw $20, 88($4)
sw $21, 92($4)
sw $22, 96($4)
sw $23, 100($4)
sw $28, 120($4) /* gp */
sw $29, 124($4) /* sp */
sw $30, 128($4) /* fp */
sw $31, 132($4) /* ra */
xor $2, $2, $2
j $31
nop
.globl SET
SET:
lw $16, 72($4)
lw $17, 76($4)
lw $18, 80($4)
lw $19, 84($4)
lw $20, 88($4)
lw $21, 92($4)
lw $22, 96($4)
lw $23, 100($4)
lw $28, 120($4) /* gp */
lw $29, 124($4) /* sp */
lw $30, 128($4) /* fp */
/*
* If we set $31 directly and j $31,
* we would loose the outer return address.
* Use a temporary register, then.
*/
lw $8, 132($4) /* ra */
/* bug: not setting the pc causes a bus error */
lw $25, 132($4) /* pc */
lw $5, 28($4)
lw $6, 32($4)
lw $7, 36($4)
lw $4, 24($4)
j $8
nop
#endif