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I commited the wrong version in previous commit.
87 lines
1.4 KiB
ArmAsm
87 lines
1.4 KiB
ArmAsm
/* ---------------------------------------------- */
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/* alloca.S */
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#ifdef __leading_underscore
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# define _(s) _##s
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#else
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# define _(s) s
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#endif
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/* ---------------------------------------------- */
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#if defined __i386__
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.globl _(alloca), _(__alloca)
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_(alloca):
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_(__alloca):
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pop %edx
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pop %eax
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add $15,%eax
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and $-16,%eax
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jz p3
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#ifdef _WIN32
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p1:
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cmp $4096,%eax
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jbe p2
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test %eax,-4096(%esp)
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sub $4096,%esp
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sub $4096,%eax
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jmp p1
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p2:
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#endif
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sub %eax,%esp
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and $-16,%esp
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mov %esp,%eax
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p3:
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push %edx
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push %edx
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ret
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/* ---------------------------------------------- */
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#elif defined __x86_64__
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.globl _(alloca)
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_(alloca):
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pop %rdx
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#ifdef _WIN32
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mov %rcx,%rax
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#else
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mov %rdi,%rax
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#endif
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add $15,%rax
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and $-16,%rax
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jz p3
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#ifdef _WIN32
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p1:
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cmp $4096,%rax
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jbe p2
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test %rax,-4096(%rsp)
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sub $4096,%rsp
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sub $4096,%rax
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jmp p1
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p2:
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#endif
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sub %rax,%rsp
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mov %rsp,%rax
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p3:
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push %rdx
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ret
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/* ---------------------------------------------- */
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#elif defined __arm__
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.text
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.align 2
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.global alloca
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.type alloca, %function
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alloca:
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rsb sp, r0, sp
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bic sp, sp, #7
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mov r0, sp
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mov pc, lr
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.size alloca, .-alloca
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/* ---------------------------------------------- */
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#endif
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