mirror of https://repo.or.cz/tinycc.git
86 lines
1.4 KiB
ArmAsm
86 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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push %ebp
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mov %esp,%ebp
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mov 8(%ebp),%eax
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add $3,%eax
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and $-4,%eax
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#ifdef _WIN32
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jmp .+16 #p2
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p1:
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sub $4096,%esp
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sub $4096,%eax
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test %eax,(%esp)
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p2:
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cmp $4096,%eax
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jae p1
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#endif
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sub %eax,%esp
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mov 4(%ebp),%eax
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mov 0(%ebp),%ebp
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add $8,%esp
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push %eax
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lea 8(%esp),%eax
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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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