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我正在尝试boost::context为 iOS 编译（armv7、armv7s、arm64）：

错误

jump_arm_aapcs_macho_gas.S:52:18: error: ',' expected
    stmia a1, {v1-v8,sp-lr} @ save V1-V8,SP-LR
                 ^
jump_arm_aapcs_macho_gas.S:53:14: error: register expected
    str lr, [a1,#40] @ save LR as PC
             ^
jump_arm_aapcs_macho_gas.S:69:18: error: invalid variant 'use'
    mov a1, a3 @ use third arg as return value after jump
                 ^
jump_arm_aapcs_macho_gas.S:70:39: error: unexpected token at start of statement
                                    @ and as first arg in context function
                                      ^
jump_arm_aapcs_macho_gas.S:71:18: error: ',' expected
    ldmia a2, {v1-v8,sp-pc} @ restore v1-V8,SP-PC
                 ^

jump_arm_aapcs_macho_gas.S

.text
.globl _jump_fcontext
.align 2
_jump_fcontext:
    stmia   a1, {v1-v8,sp-lr}       @ save V1-V8,SP-LR
    str     lr, [a1,#40]            @ save LR as PC

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

    mov     a4, a1
    add     a4, #52
    vstmia  a4, {d8-d15}            @ save S16-S31

    mov     a4, a2
    add     a4, #52
    vldmia  a4, {d8-d15}            @ restore S16-S31
1:
#endif

    mov     a1, a3                  @ use third arg as return value after jump
                                    @ and as first arg in context function
    ldmia   a2, {v1-v8,sp-pc}       @ restore v1-V8,SP-PC

如果我删除 arm64，并将架构设置为仅 armv7，它会编译，所以代码应该没问题。

有没有办法让它为 arm64 编译？

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1 回答 1

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ARM64 (AArch64) 与 ARM32 (A32) 在指令和寄存器集上都有很大不同。调用约定 (ABI) 也不同。您需要重写汇编程序片段。我建议您联系开发人员，因为您似乎不熟悉低级别的细节来自己做。

于 2014-06-13T11:46:12.593 回答