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jump and make stubs for arm64 (aarch64) for iOS ABI #5

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Dec 30, 2014
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jump and make stubs for arm64 (aarch64) for iOS ABI #5

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126 changes: 61 additions & 65 deletions src/asm/jump_arm64_aapcs_macho_gas.S
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,124 +1,120 @@
/*
Copyright Oliver Kowalke 2014.
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 | *
* ------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| *
* ------------------------------------------------- *
* | s16 | s17 | s18 | s19 | *
* | d8 | d9 | d10 | d11 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
* ------------------------------------------------- *
* | s20 | s21 | s22 | s23 | *
* | d12 | d13 | d14 | d15 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
* ------------------------------------------------- *
* | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| *
* ------------------------------------------------- *
* | s24 | s25 | s26 | s27 | *
* | x19 | x20 | x21 | x22 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
* ------------------------------------------------- *
* | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| *
* ------------------------------------------------- *
* | s28 | s29 | s30 | s31 | *
* | x23 | x24 | x25 | x26 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
* ------------------------------------------------- *
* | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| *
* ------------------------------------------------- *
* | sjlj | v1 | v2 | v3 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | *
* | x27 | x28 | FP | LR | *
* ------------------------------------------------- *
* | 0xa0| 0xa4| 0xa8| 0xac| 0xb0| 0xb4| 0xb8| 0xbc| *
* ------------------------------------------------- *
* | v4 | v5 | v6 | v7 | *
* | 40 | 41 | 42 | 43 | | | *
* ------------------------------------------------- *
* | 0xa0| 0xa4| 0xa8| 0xac| | | *
* ------------------------------------------------- *
* | 48 | 49 | 50 | 51 | 52 | 53 | | *
* ------------------------------------------------- *
* | 0xc0| 0xc4| 0xc8| 0xcc| 0xd0| 0xd4| | *
* ------------------------------------------------- *
* | v8 | lr | pc | | *
* | PC | align | | | *
* ------------------------------------------------- *
* *
*******************************************************/

.text
.globl _jump_fcontext
.align 2
.balign 16
_jump_fcontext:
@ save LR as PC
push {lr}
@ save V1-V8,LR
push {v1-v8,lr}

@ locate TLS to save/restore SjLj handler
mrc p15, 0, v2, c13, c0, #3
bic v2, v2, #3

@ load TLS[__PTK_LIBC_DYLD_Unwind_SjLj_Key]
ldr v1, [v2, #72]
@ save SjLj handler
push {v1}

@ prepare stack for FPU
sub sp, sp, #128
; prepare stack for GP + FPU
sub sp, sp, #0xb0

#if (defined(__VFP_FP__) && !defined(__SOFTFP__))
@ test if fpu env should be preserved
cmp a4, #0
beq 1f
; test if fpu env should be preserved
cmp w3, #0
b.eq 1f

@ save S16-S31
vstmia sp, {d8-d15}
; save d8 - d15
stp d8, d9, [x0, #0x00]
stp d10, d11, [x0, #0x10]
stp d12, d13, [x0, #0x20]
stp d14, d15, [x0, #0x30]

1:
#endif

@ store RSP (pointing to context-data) in A1
str sp, [a1]
; save x19-x30
stp x19, x20, [sp, #0x40]
stp x21, x22, [sp, #0x50]
stp x23, x24, [sp, #0x60]
stp x25, x26, [sp, #0x70]
stp x27, x28, [sp, #0x80]
stp fp, lr, [sp, #0x90]

; save LR as PC
str lr, [sp, #0xa0]

@ restore RSP (pointing to context-data) from A2
mov sp, a2
; store RSP (pointing to context-data) in first argument (x0).
; STR cannot have sp as a target register
mov x4, sp
str x4, [x0]

; restore RSP (pointing to context-data) from A2 (x1)
mov sp, x1

#if (defined(__VFP_FP__) && !defined(__SOFTFP__))
@ test if fpu env should be preserved
cmp a4, #0
beq 2f
; test if fpu env should be preserved
cmp w3, #0
b.eq 2f

@ restore S16-S31
vldmia sp, {d8-d15}
; load d8 - d15
ldp d8, d9, [x0, #0x00]
ldp d10, d11, [x0, #0x10]
ldp d12, d13, [x0, #0x20]
ldp d14, d15, [x0, #0x30]

2:
#endif

@ prepare stack for FPU
add sp, sp, #128
; load x19-x30
ldp x19, x20, [sp, #0x40]
ldp x21, x22, [sp, #0x50]
ldp x23, x24, [sp, #0x60]
ldp x25, x26, [sp, #0x70]
ldp x27, x28, [sp, #0x80]
ldp fp, lr, [sp, #0x90]

; use third arg as return value after jump
; and as first arg in context function
mov x0, x2

; load pc
ldr x4, [sp, #0xa0]

@ restore SjLj handler
pop {v1}
@ store SjLj handler in TLS
str v1, [v2, #72]
; restore stack from GP + FPU
add sp, sp, #0xb0

@ use third arg as return value after jump
@ and as first arg in context function
mov a1, a3

@ restore v1-V8,LR,PC
pop {v1-v8,lr,pc}
ret x4
72 changes: 34 additions & 38 deletions src/asm/make_arm64_aapcs_macho_gas.S
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,87 +1,83 @@
/*
Copyright Oliver Kowalke 2014.
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 | *
* ------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| *
* ------------------------------------------------- *
* | s16 | s17 | s18 | s19 | *
* | d8 | d9 | d10 | d11 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
* ------------------------------------------------- *
* | s20 | s21 | s22 | s23 | *
* | d12 | d13 | d14 | d15 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
* ------------------------------------------------- *
* | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| *
* ------------------------------------------------- *
* | s24 | s25 | s26 | s27 | *
* | x19 | x20 | x21 | x22 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
* ------------------------------------------------- *
* | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| *
* ------------------------------------------------- *
* | s28 | s29 | s30 | s31 | *
* | x23 | x24 | x25 | x26 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
* ------------------------------------------------- *
* | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| *
* ------------------------------------------------- *
* | sjlj | v1 | v2 | v3 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | *
* | x27 | x28 | FP | LR | *
* ------------------------------------------------- *
* | 0xa0| 0xa4| 0xa8| 0xac| 0xb0| 0xb4| 0xb8| 0xbc| *
* ------------------------------------------------- *
* | v4 | v5 | v6 | v7 | *
* | 40 | 41 | 42 | 43 | | | *
* ------------------------------------------------- *
* | 0xa0| 0xa4| 0xa8| 0xac| | | *
* ------------------------------------------------- *
* | 48 | 49 | 50 | 51 | 52 | 53 | | *
* ------------------------------------------------- *
* | 0xc0| 0xc4| 0xc8| 0xcc| 0xd0| 0xd4| | *
* ------------------------------------------------- *
* | v8 | lr | pc | | *
* | PC | align | | | *
* ------------------------------------------------- *
* *
*******************************************************/


.text
.globl _make_fcontext
.align 2
.balign 16

_make_fcontext:
@ shift address in A1 to lower 16 byte boundary
bic a1, a1, #15
; shift address in x0 (allocated stack) to lower 16 byte boundary
and x0, x0, ~0xF

; reserve space for context-data on context-stack
sub x0, x0, #0xb0

; third arg of make_fcontext() == address of context-function
; store address as a PC to jump in
str x2, [x0, #0xa0]

@ reserve space for context-data on context-stack
sub a1, a1, #216
; compute abs address of label finish
; 0x0c = 3 instructions * size (4) before label 'finish'

@ third arg of make_fcontext() == address of context-function
str a3, [a1,#208]
; TODO: Numeric offset since llvm still does not support labels in ADR. Fix:
; http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140407/212336.html
adr x1, 0x0c

@ compute abs address of label finish
adr a2, finish
@ save address of finish as return-address for context-function
@ will be entered after context-function returns
str a2, [a1,#200]
; save address of finish as return-address for context-function
; will be entered after context-function returns (LR register)
str x1, [x0, #0x98]

bx lr @ return pointer to context-data
ret lr ; return pointer to context-data (x0)

finish:
@ exit code is zero
mov a1, #0
@ exit application
; exit code is zero
mov x0, #0
; exit application
bl __exit