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/*
Copyright Oliver Kowalke 2009.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/
/*******************************************************************
* *
* ------------------------------------------------------------- *
* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | *
* ------------------------------------------------------------- *
* | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | *
* ------------------------------------------------------------- *
* | R13 | R14 | R15 | R16 | R17 | R18 | R19 | R20 | R21 | R22 | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | *
* ------------------------------------------------------------- *
* | 40 | 44 | 48 | 52 | 56 | 60 | 64 | 68 | 72 | 76 | *
* ------------------------------------------------------------- *
* | R23 | R24 | R25 | R26 | R27 | R28 | R29 | R30 | R31 | SP | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 20 | 21 | 22 | | *
* ------------------------------------------------------------- *
* | 80 | 84 | 88 | | *
* ------------------------------------------------------------- *
* | CR | LR | PC | | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 23 | 24 | | *
* ------------------------------------------------------------- *
* | 92 | 96 | | *
* ------------------------------------------------------------- *
* |sbase|slimt| | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | *
* ------------------------------------------------------------- *
* | 100 | 104 | 108 | 112 | 116 | 120 | 124 | 128 | 132 | 136 | *
* ------------------------------------------------------------- *
* | F14 | F15 | F16 | F17 | F18 | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | *
* ------------------------------------------------------------- *
* | 140 | 144 | 148 | 152 | 156 | 160 | 164 | 168 | 172 | 176 | *
* ------------------------------------------------------------- *
* | F19 | F20 | F21 | F22 | F23 | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | *
* ------------------------------------------------------------- *
* | 180 | 184 | 188 | 192 | 196 | 200 | 204 | 208 | 212 | 216 | *
* ------------------------------------------------------------- *
* | F24 | F25 | F26 | F27 | F28 | *
* ------------------------------------------------------------- *
* ------------------------------------------------------------- *
* | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | | *
* ------------------------------------------------------------- *
* | 220 | 224 | 228 | 232 | 236 | 240 | 244 | 248 | | *
* ------------------------------------------------------------- *
* | F29 | F30 | F31 | fpscr | | *
* ------------------------------------------------------------- *
* *
* *****************************************************************/
.text
.globl jump_fcontext
.align 2
.type jump_fcontext,@function
jump_fcontext:
stw %r13, 0(%r3) # save R13
stw %r14, 4(%r3) # save R14
stw %r15, 8(%r3) # save R15
stw %r16, 12(%r3) # save R16
stw %r17, 16(%r3) # save R17
stw %r18, 20(%r3) # save R18
stw %r19, 24(%r3) # save R19
stw %r20, 28(%r3) # save R20
stw %r21, 32(%r3) # save R21
stw %r22, 36(%r3) # save R22
stw %r23, 40(%r3) # save R23
stw %r24, 44(%r3) # save R24
stw %r25, 48(%r3) # save R25
stw %r26, 52(%r3) # save R26
stw %r27, 56(%r3) # save R27
stw %r28, 60(%r3) # save R28
stw %r29, 64(%r3) # save R29
stw %r30, 68(%r3) # save R30
stw %r31, 72(%r3) # save R31
stw %r1, 76(%r3) # save SP
mfcr %r0 # load CR
stw %r0, 80(%r3) # save CR
mflr %r0 # load LR
stw %r0, 84(%r3) # save LR
stw %r0, 88(%r3) # save LR as PC
cmpwi cr7, %r6, 0 # test if fpu env should be preserved
beq cr7, 1f
stfd %f14, 100(%r3) # save F14
stfd %f15, 108(%r3) # save F15
stfd %f16, 116(%r3) # save F16
stfd %f17, 124(%r3) # save F17
stfd %f18, 132(%r3) # save F18
stfd %f19, 140(%r3) # save F19
stfd %f20, 148(%r3) # save F20
stfd %f21, 156(%r3) # save F21
stfd %f22, 164(%r3) # save F22
stfd %f23, 172(%r3) # save F23
stfd %f24, 180(%r3) # save F24
stfd %f25, 188(%r3) # save F25
stfd %f26, 196(%r3) # save F26
stfd %f27, 204(%r3) # save F27
stfd %f28, 212(%r3) # save F28
stfd %f29, 220(%r3) # save F29
stfd %f30, 228(%r3) # save F30
stfd %f31, 236(%r3) # save F31
mffs %f0 # load FPSCR
stfd %f0, 244(%r3) # save FPSCR
lfd %f14, 100(%r4) # restore F14
lfd %f15, 108(%r4) # restore F15
lfd %f16, 116(%r4) # restore F16
lfd %f17, 124(%r4) # restore F17
lfd %f18, 132(%r4) # restore F18
lfd %f19, 140(%r4) # restore F19
lfd %f20, 148(%r4) # restore F20
lfd %f21, 156(%r4) # restore F21
lfd %f22, 164(%r4) # restore F22
lfd %f23, 172(%r4) # restore F23
lfd %f24, 180(%r4) # restore F24
lfd %f25, 188(%r4) # restore F25
lfd %f26, 196(%r4) # restore F26
lfd %f27, 204(%r4) # restore F27
lfd %f28, 212(%r4) # restore F28
lfd %f29, 220(%r4) # restore F29
lfd %f30, 228(%r4) # restore F30
lfd %f31, 236(%r4) # restore F31
lfd %f0, 244(%r4) # load FPSCR
mtfsf 0xff, %f0 # restore FPSCR
1:
lwz %r13, 0(%r4) # restore R13
lwz %r14, 4(%r4) # restore R14
lwz %r15, 8(%r4) # restore R15
lwz %r16, 12(%r4) # restore R16
lwz %r17, 16(%r4) # restore R17
lwz %r18, 20(%r4) # restore R18
lwz %r19, 24(%r4) # restore R19
lwz %r20, 28(%r4) # restore R20
lwz %r21, 32(%r4) # restore R21
lwz %r22, 36(%r4) # restore R22
lwz %r23, 40(%r4) # restore R23
lwz %r24, 44(%r4) # restore R24
lwz %r25, 48(%r4) # restore R25
lwz %r26, 52(%r4) # restore R26
lwz %r27, 56(%r4) # restore R27
lwz %r28, 60(%r4) # restore R28
lwz %r29, 64(%r4) # restore R29
lwz %r30, 68(%r4) # restore R30
lwz %r31, 72(%r4) # restore R31
lwz %r1, 76(%r4) # restore SP
lwz %r0, 80(%r4) # load CR
mtcr %r0 # restore CR
lwz %r0, 84(%r4) # load LR
mtlr %r0 # restore LR
mr. %r3, %r5 # use third arg as return value after jump
# and as first arg in context function
lwz %r0, 88(%r4) # load PC
mtctr %r0 # restore CTR
bctr # jump to context
.size jump_fcontext, .-jump_fcontext
.text
.globl make_fcontext
.align 2
.type make_fcontext,@function
make_fcontext:
stw %r3, 0(%r3) # save the current context
stw %r4, 88(%r3) # save the address of the context function
lwz %r0, 92(%r3) # load the stack base
li %r4, 28
subf %r1, %r4, %r1 # reserve space on stack
stw %r3, 24(%r1) # store pointer to fcontext_t on stack
mflr %r4 # load LR
stw %r4, 20(%r1) # store LR on stack
mr. %r3, %r0 # context stack as arg to align_stack
bl align_stack@plt # call align_stack
mr. %r0, %r3 # load result into R0
lwz %r4, 20(%r1) # pop LR from stack
mtlr %r4 # restore LR
lwz %r3, 24(%r1) # pop pointer to fcontext_t from stack
addi %r1, %r1, 28 # release space on stack
li %r4, 32
subf %r0, %r4, %r0 # 32 bytes on stack for parameter area(== 8 registers)
stw %r0, 76(%r3) # save the aligned stack base
mflr %r0 # load LR
bl 1f # jump to label 1
1:
mflr %r4 # load LR
addi %r4, %r4, finish - 1b # address of finish; called after context function returns
mtlr %r0 # restore LR
stw %r4, 84(%r3)
li %r3, 0
blr
finish:
li %r3, 0 # exit code is zero
bl _exit@plt # exit application
.size make_fcontext, .-make_fcontext
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