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From efcdb6aae82d2ade5b81183e961e9ef282eaca31 Mon Sep 17 00:00:00 2001
From: Evgeny Shapovalov <johncapful@yandex-team.ru>
Date: Tue, 30 Dec 2014 17:14:49 +0300
Subject: [PATCH 15/54] jump and make stubs for arm64 (aarch64) for iOS ABI
---
src/asm/jump_arm64_aapcs_macho_gas.S | 126 +++++++++++++++++------------------
src/asm/make_arm64_aapcs_macho_gas.S | 72 ++++++++++----------
2 files changed, 95 insertions(+), 103 deletions(-)
diff --git a/libs/context/src/asm/jump_arm64_aapcs_macho_gas.S b/libs/context/src/asm/jump_arm64_aapcs_macho_gas.S
index 6ad5b38..29df555 100644
--- a/libs/context/src/asm/jump_arm64_aapcs_macho_gas.S
+++ b/libs/context/src/asm/jump_arm64_aapcs_macho_gas.S
@@ -1,10 +1,3 @@
-/*
- 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)
-*/
-
/*******************************************************
* *
* ------------------------------------------------- *
@@ -12,113 +5,116 @@
* ------------------------------------------------- *
* | 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
diff --git a/libs/context/src/asm/make_arm64_aapcs_macho_gas.S b/libs/context/src/asm/make_arm64_aapcs_macho_gas.S
index 67d2f89..6b55a08 100644
--- a/libs/context/src/asm/make_arm64_aapcs_macho_gas.S
+++ b/libs/context/src/asm/make_arm64_aapcs_macho_gas.S
@@ -1,10 +1,3 @@
-/*
- 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)
-*/
-
/*******************************************************
* *
* ------------------------------------------------- *
@@ -12,76 +5,79 @@
* ------------------------------------------------- *
* | 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
+
+
--
2.3.5
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