From 8481d3ccfc8e9cd3b689c43418e27ccfe722fcb2 Mon Sep 17 00:00:00 2001

From: Oliver Kowalke <oliver.kowalke@gmx.de>

Date: Mon, 23 Feb 2015 16:23:11 +0100

Subject: [PATCH 46/54] add support for ARM64/ELF

---

 build/Jamfile.v2                   |  30 +++++++++

 config/arm.cpp                     |   2 +-

 src/asm/jump_arm64_aapcs_elf_gas.S | 131 +++++++++++++++++++++++++++++++++++++

 src/asm/make_arm64_aapcs_elf_gas.S |  85 ++++++++++++++++++++++++

 4 files changed, 247 insertions(+), 1 deletion(-)

 create mode 100644 src/asm/jump_arm64_aapcs_elf_gas.S

 create mode 100644 src/asm/make_arm64_aapcs_elf_gas.S

diff --git a/libs/context/build/Jamfile.v2 b/libs/context/build/Jamfile.v2

index 80d1c46..4bf3fce 100644

--- a/libs/context/build/Jamfile.v2

+++ b/libs/context/build/Jamfile.v2

@@ -223,6 +223,36 @@ alias asm_context_sources

    ;

 # ARM64

+# ARM64/AAPCS/ELF

+alias asm_context_sources

+   : [ make asm/make_arm64_aapcs_elf_gas.o : asm/make_arm64_aapcs_elf_gas.S : @gas64 ]

+     [ make asm/jump_arm64_aapcs_elf_gas.o : asm/jump_arm64_aapcs_elf_gas.S : @gas64 ]

+   : <abi>aapcs

+     <address-model>64

+     <architecture>arm

+     <binary-format>elf

+   ;

+

+alias asm_context_sources

+   : asm/make_arm64_aapcs_elf_gas.S

+     asm/jump_arm64_aapcs_elf_gas.S

+   : <abi>aapcs

+     <address-model>64

+     <architecture>arm

+     <binary-format>elf

+     <toolset>clang

+   ;

+

+alias asm_context_sources

+   : asm/make_arm64_aapcs_elf_gas.S

+     asm/jump_arm64_aapcs_elf_gas.S

+   : <abi>aapcs

+     <address-model>64

+     <architecture>arm

+     <binary-format>elf

+     <toolset>gcc

+   ;

+

 # ARM64/AAPCS/MACH-O

 alias asm_context_sources

    : [ make asm/make_arm64_aapcs_macho_gas.o : asm/make_arm64_aapcs_macho_gas.S : @gas64 ]

diff --git a/libs/context/config/arm.cpp b/libs/context/config/arm.cpp

index 6a83737..6eece0b 100644

--- a/libs/context/config/arm.cpp

+++ b/libs/context/config/arm.cpp

@@ -6,7 +6,7 @@

 // accompanying file LICENSE_1_0.txt or copy at

 // http://www.boost.org/LICENSE_1_0.txt)

-#if !defined(__arm__) && !defined(__thumb__) && \

+#if !defined(__aarch64__) && !defined(__arm__) && !defined(__thumb__) && \

     !defined(__TARGET_ARCH_ARM) && !defined(__TARGET_ARCH_THUMB) && \

     !defined(_ARM) && !defined(_M_ARM)

 #error "Not ARM"

diff --git a/libs/context/src/asm/jump_arm64_aapcs_elf_gas.S b/libs/context/src/asm/jump_arm64_aapcs_elf_gas.S

new file mode 100644

index 0000000..46e029d

--- /dev/null

+++ b/libs/context/src/asm/jump_arm64_aapcs_elf_gas.S

@@ -0,0 +1,131 @@

+/*

+            Copyright Edward Nevill 2015

+   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|  *

+ *  -------------------------------------------------  *

+ *  |    d8     |    d9     |    d10    |    d11    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *

+ *  -------------------------------------------------  *

+ *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *

+ *  -------------------------------------------------  *

+ *  |    d12    |    d13    |    d14    |    d15    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *

+ *  -------------------------------------------------  *

+ *  | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c|  *

+ *  -------------------------------------------------  *

+ *  |    x19    |    x20    |    x21    |    x22    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *

+ *  -------------------------------------------------  *

+ *  | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c|  *

+ *  -------------------------------------------------  *

+ *  |    x23    |    x24    |    x25    |    x26    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  32 |  33 |  34 |  35 |  36 |  37 |  38 |  39 |  *

+ *  -------------------------------------------------  *

+ *  | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c|  *

+ *  -------------------------------------------------  *

+ *  |    x27    |    x28    |    FP     |     LR    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  40 |  41 |  42 | 43  |           |           |  *

+ *  -------------------------------------------------  *

+ *  | 0xa0| 0xa4| 0xa8| 0xac|           |           |  *

+ *  -------------------------------------------------  *

+ *  |     PC    |   align   |           |           |  *

+ *  -------------------------------------------------  *

+ *                                                     *

+ *******************************************************/

+

+.cpu    generic+fp+simd

+.text

+.align  2

+.global jump_fcontext

+.type   jump_fcontext, %function

+jump_fcontext:

+    # prepare stack for GP + FPU

+    sub  sp, sp, #0xb0

+

+# Because gcc may save integer registers in fp registers across a

+# function call we cannot skip saving the fp registers.

+#

+# Do not reinstate this test unless you fully understand what you

+# are doing.

+#

+#    # test if fpu env should be preserved

+#    cmp  w3, #0

+#    b.eq  1f

+

+    # save d8 - d15

+    stp    d8, d9,   [sp, #0x00]

+    stp    d10, d11, [sp, #0x10]

+    stp    d12, d13, [sp, #0x20]

+    stp    d14, d15, [sp, #0x30]

+

+1:

+    # 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 x29, x30, [sp, #0x90]

+

+    # save LR as PC

+    str x30, [sp, #0xa0]

+

+    # 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

+

+#    # test if fpu env should be preserved

+#    cmp  w3, #0

+#    b.eq  2f

+

+    # load d8 - d15

+    ldp    d8, d9,   [x0, #0x00]

+    ldp    d10, d11, [x0, #0x10]

+    ldp    d12, d13, [x0, #0x20]

+    ldp    d14, d15, [x0, #0x30]

+

+2:

+    # 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 x29, x30, [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 stack from GP + FPU

+    add  sp, sp, #0xb0

+

+    ret x4

+.size   jump_fcontext,.-jump_fcontext

+# Mark that we don't need executable stack.

+.section .note.GNU-stack,"",%progbits

diff --git a/libs/context/src/asm/make_arm64_aapcs_elf_gas.S b/libs/context/src/asm/make_arm64_aapcs_elf_gas.S

new file mode 100644

index 0000000..b208ab7

--- /dev/null

+++ b/libs/context/src/asm/make_arm64_aapcs_elf_gas.S

@@ -0,0 +1,85 @@

+/*

+            Copyright Edward Nevill 2015

+   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|  *

+ *  -------------------------------------------------  *

+ *  |    d8     |    d9     |    d10    |    d11    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *

+ *  -------------------------------------------------  *

+ *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *

+ *  -------------------------------------------------  *

+ *  |    d12    |    d13    |    d14    |    d15    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *

+ *  -------------------------------------------------  *

+ *  | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c|  *

+ *  -------------------------------------------------  *

+ *  |    x19    |    x20    |    x21    |    x22    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *

+ *  -------------------------------------------------  *

+ *  | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c|  *

+ *  -------------------------------------------------  *

+ *  |    x23    |    x24    |    x25    |    x26    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  32 |  33 |  34 |  35 |  36 |  37 |  38 |  39 |  *

+ *  -------------------------------------------------  *

+ *  | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c|  *

+ *  -------------------------------------------------  *

+ *  |    x27    |    x28    |    FP     |     LR    |  *

+ *  -------------------------------------------------  *

+ *  -------------------------------------------------  *

+ *  |  40 |  41 |  42 | 43  |           |           |  *

+ *  -------------------------------------------------  *

+ *  | 0xa0| 0xa4| 0xa8| 0xac|           |           |  *

+ *  -------------------------------------------------  *

+ *  |     PC    |   align   |           |           |  *

+ *  -------------------------------------------------  *

+ *                                                     *

+ *******************************************************/

+

+.cpu    generic+fp+simd

+.text

+.align  2

+.global make_fcontext

+.type   make_fcontext, %function

+make_fcontext:

+    # 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]

+

+    # save address of finish as return-address for context-function

+    # will be entered after context-function returns (LR register)

+    adr  x1, finish

+    str  x1, [x0, #0x98]

+

+    ret  x30 // return pointer to context-data (x0)

+

+finish:

+    # exit code is zero

+    mov  x0, #0

+    # exit application

+    bl  _exit

+

+.size   make_fcontext,.-make_fcontext

+# Mark that we don't need executable stack.

+.section .note.GNU-stack,"",%progbits

-- 

2.3.5