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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 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
* ------------------------------------------------- *
* |bchai|hiddn| fpscr | PC | CR | R14 | R15 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | *
* ------------------------------------------------- *
* | R16 | R17 | R18 | R19 | R20 | R21 | R22 | R23 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | *
* ------------------------------------------------- *
* | R24 | R25 | R26 | R27 | R28 | R29 | R30 | R31 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | *
* ------------------------------------------------- *
* | F14 | F15 | F16 | F17 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | *
* ------------------------------------------------- *
* | F18 | F19 | F20 | F21 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 160 | 164 | 168 | 172 | 176 | 180 | 184 | 188 | *
* ------------------------------------------------- *
* | F22 | F23 | F24 | F25 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 192 | 196 | 200 | 204 | 208 | 212 | 216 | 220 | *
* ------------------------------------------------- *
* | F26 | F27 | F28 | F29 | *
* ------------------------------------------------- *
* ------------------------|------------ *
* | 224 | 228 | 232 | 236 | 240 | 244 | *
* ------------------------|------------ *
* | F30 | F31 |bchai| LR | *
* ------------------------|------------ *
* *
*******************************************************/
.file "jump_ppc32_sysv_elf_gas.S"
.text
.globl jump_fcontext
.align 2
.type jump_fcontext,@function
jump_fcontext:
# Linux: jump_fcontext( hidden transfer_t * R3, R4, R5)
# Other: transfer_t R3:R4 = jump_fcontext( R3, R4)
mflr %r0 # return address from LR
mffs %f0 # FPSCR
mfcr %r8 # condition register
stwu %r1, -240(%r1) # allocate stack space, R1 % 16 == 0
stw %r0, 244(%r1) # save LR in caller's frame
#ifdef __linux__
stw %r3, 4(%r1) # hidden pointer
#endif
stfd %f0, 8(%r1) # FPSCR
stw %r0, 16(%r1) # LR as PC
stw %r8, 20(%r1) # CR
# Save registers R14 to R31.
# Don't change R2, the thread-local storage pointer.
# Don't change R13, the small data pointer.
stw %r14, 24(%r1)
stw %r15, 28(%r1)
stw %r16, 32(%r1)
stw %r17, 36(%r1)
stw %r18, 40(%r1)
stw %r19, 44(%r1)
stw %r20, 48(%r1)
stw %r21, 52(%r1)
stw %r22, 56(%r1)
stw %r23, 60(%r1)
stw %r24, 64(%r1)
stw %r25, 68(%r1)
stw %r26, 72(%r1)
stw %r27, 76(%r1)
stw %r28, 80(%r1)
stw %r29, 84(%r1)
stw %r30, 88(%r1)
stw %r31, 92(%r1)
# Save registers F14 to F31 in slots with 8-byte alignment.
# 4-byte alignment may stall the pipeline of some processors.
# Less than 4 may cause alignment traps.
stfd %f14, 96(%r1)
stfd %f15, 104(%r1)
stfd %f16, 112(%r1)
stfd %f17, 120(%r1)
stfd %f18, 128(%r1)
stfd %f19, 136(%r1)
stfd %f20, 144(%r1)
stfd %f21, 152(%r1)
stfd %f22, 160(%r1)
stfd %f23, 168(%r1)
stfd %f24, 176(%r1)
stfd %f25, 184(%r1)
stfd %f26, 192(%r1)
stfd %f27, 200(%r1)
stfd %f28, 208(%r1)
stfd %f29, 216(%r1)
stfd %f30, 224(%r1)
stfd %f31, 232(%r1)
# store RSP (pointing to context-data) in R7/R6
# restore RSP (pointing to context-data) from R4/R3
#ifdef __linux__
mr %r7, %r1
mr %r1, %r4
lwz %r3, 4(%r1) # hidden pointer
#else
mr %r6, %r1
mr %r1, %r3
#endif
lfd %f0, 8(%r1) # FPSCR
lwz %r0, 16(%r1) # PC
lwz %r8, 20(%r1) # CR
mtfsf 0xff, %f0 # restore FPSCR
mtctr %r0 # load CTR with PC
mtcr %r8 # restore CR
# restore R14 to R31
lwz %r14, 24(%r1)
lwz %r15, 28(%r1)
lwz %r16, 32(%r1)
lwz %r17, 36(%r1)
lwz %r18, 40(%r1)
lwz %r19, 44(%r1)
lwz %r20, 48(%r1)
lwz %r21, 52(%r1)
lwz %r22, 56(%r1)
lwz %r23, 60(%r1)
lwz %r24, 64(%r1)
lwz %r25, 68(%r1)
lwz %r26, 72(%r1)
lwz %r27, 76(%r1)
lwz %r28, 80(%r1)
lwz %r29, 84(%r1)
lwz %r30, 88(%r1)
lwz %r31, 92(%r1)
# restore F14 to F31
lfd %f14, 96(%r1)
lfd %f15, 104(%r1)
lfd %f16, 112(%r1)
lfd %f17, 120(%r1)
lfd %f18, 128(%r1)
lfd %f19, 136(%r1)
lfd %f20, 144(%r1)
lfd %f21, 152(%r1)
lfd %f22, 160(%r1)
lfd %f23, 168(%r1)
lfd %f24, 176(%r1)
lfd %f25, 184(%r1)
lfd %f26, 192(%r1)
lfd %f27, 200(%r1)
lfd %f28, 208(%r1)
lfd %f29, 216(%r1)
lfd %f30, 224(%r1)
lfd %f31, 232(%r1)
# restore LR from caller's frame
lwz %r0, 244(%r1)
mtlr %r0
# adjust stack
addi %r1, %r1, 240
# return transfer_t
#ifdef __linux__
stw %r7, 0(%r3)
stw %r5, 4(%r3)
#else
mr %r3, %r6
# %r4, %r4
#endif
# jump to context
bctr
.size jump_fcontext, .-jump_fcontext
/* Mark that we don't need executable stack. */
.section .note.GNU-stack,"",%progbits
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