61 lines
1.1 KiB
ArmAsm
61 lines
1.1 KiB
ArmAsm
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/* ---------------------------------------------- */
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/* alloca86_64.S */
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.globl __bound_alloca
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__bound_alloca:
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#ifdef TCC_TARGET_PE
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# bound checking is not implemented
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pop %rdx
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mov %rcx,%rax
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add $15,%rax
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and $-16,%rax
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jz p3
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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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sub %rax,%rsp
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mov %rsp,%rax
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add $32,%rax
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p3:
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push %rdx
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ret
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#else
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pop %rdx
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mov %rdi,%rax
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movl %rax,%rsi # size, a second parm to the __bound_new_region
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add $15,%rax
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and $-16,%rax
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jz p3
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sub %rax,%rsp
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mov %rsp,%rdi # pointer, a first parm to the __bound_new_region
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mov %rsp,%rax
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push %rdx
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push %rax
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call __bound_new_region
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pop %rax
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pop %rdx
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p3:
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push %rdx
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ret
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#endif
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/* mark stack as nonexecutable */
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#if defined __ELF__ && defined __linux__
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.section .note.GNU-stack,"",@progbits
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#endif
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/* ---------------------------------------------- */
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