forked from Mirrors/tinycc
192 lines
3.9 KiB
ArmAsm
192 lines
3.9 KiB
ArmAsm
/* ---------------------------------------------- */
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/* chkstk86.s */
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/* ---------------------------------------------- */
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#ifndef __x86_64__
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/* ---------------------------------------------- */
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.globl __chkstk
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__chkstk:
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xchg (%esp),%ebp /* store ebp, get ret.addr */
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push %ebp /* push ret.addr */
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lea 4(%esp),%ebp /* setup frame ptr */
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push %ecx /* save ecx */
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mov %ebp,%ecx
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P0:
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sub $4096,%ecx
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test %eax,(%ecx)
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sub $4096,%eax
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cmp $4096,%eax
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jge P0
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sub %eax,%ecx
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test %eax,(%ecx)
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mov %esp,%eax
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mov %ecx,%esp
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mov (%eax),%ecx /* restore ecx */
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jmp *4(%eax)
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/* ---------------------------------------------- */
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#else
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/* ---------------------------------------------- */
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.globl __chkstk
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__chkstk:
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xchg (%rsp),%rbp /* store ebp, get ret.addr */
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push %rbp /* push ret.addr */
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lea 8(%rsp),%rbp /* setup frame ptr */
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push %rcx /* save ecx */
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mov %rbp,%rcx
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movslq %eax,%rax
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P0:
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sub $4096,%rcx
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test %rax,(%rcx)
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sub $4096,%rax
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cmp $4096,%rax
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jge P0
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sub %rax,%rcx
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test %rax,(%rcx)
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mov %rsp,%rax
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mov %rcx,%rsp
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mov (%rax),%rcx /* restore ecx */
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jmp *8(%rax)
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/* ---------------------------------------------- */
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/* setjmp/longjmp support */
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.globl tinyc_getbp
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tinyc_getbp:
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mov %rbp,%rax
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ret
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/* ---------------------------------------------- */
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#endif
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/* ---------------------------------------------- */
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/* ---------------------------------------------- */
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#ifndef __x86_64__
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/* ---------------------------------------------- */
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/*
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int _except_handler3(
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PEXCEPTION_RECORD exception_record,
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PEXCEPTION_REGISTRATION registration,
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PCONTEXT context,
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PEXCEPTION_REGISTRATION dispatcher
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);
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int __cdecl _XcptFilter(
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unsigned long xcptnum,
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PEXCEPTION_POINTERS pxcptinfoptrs
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);
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struct _sehrec {
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void *esp; // 0
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void *exception_pointers; // 1
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void *prev; // 2
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void *handler; // 3
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void *scopetable; // 4
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int trylevel; // 5
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void *ebp // 6
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};
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// this is what the assembler code below means:
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__try
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{
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// ...
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}
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__except (_XcptFilter(GetExceptionCode(), GetExceptionInformation()))
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{
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exit(GetExceptionCode());
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}
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*/
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.globl _exception_info
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_exception_info:
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mov 1*4-24(%ebp),%eax
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ret
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.globl _exception_code
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_exception_code:
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call _exception_info
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mov (%eax),%eax
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mov (%eax),%eax
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ret
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seh_filter:
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call _exception_info
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push %eax
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call _exception_code
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push %eax
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call _XcptFilter
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add $ 8,%esp
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ret
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seh_except:
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mov 0*4-24(%ebp),%esp
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call _exception_code
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push %eax
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call _exit
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// msvcrt wants scopetables aligned and in read-only segment (using .text)
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.align 4
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seh_scopetable:
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.long -1
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.long seh_filter
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.long seh_except
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seh_handler:
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jmp _except_handler3
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.globl ___try__
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___try__:
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.globl __try__
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__try__:
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push %ebp
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mov 8(%esp),%ebp
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// void *esp;
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lea 12(%esp),%eax
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mov %eax,0*4(%ebp)
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// void *exception_pointers;
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xor %eax,%eax
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mov %eax,1*4(%ebp)
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// void *prev;
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mov %fs:0,%eax
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mov %eax,2*4(%ebp)
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// void *handler;
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mov $ seh_handler,%eax
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mov %eax,3*4(%ebp)
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// void *scopetable;
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mov $ seh_scopetable,%eax
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mov %eax,4*4(%ebp)
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// int trylevel;
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xor %eax,%eax
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mov %eax,5*4(%ebp)
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// register new SEH
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lea 2*4(%ebp),%eax
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mov %eax,%fs:0
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pop %ebp
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ret
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/* ---------------------------------------------- */
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#else
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/* ---------------------------------------------- */
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/* SEH on x86-64 not implemented */
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/* ---------------------------------------------- */
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#endif
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/* ---------------------------------------------- */
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