tinycc/lib/alloca86.S

/* ---------------------------------------------- */
/* alloca86.S */

.globl alloca

alloca:
    pop     %edx
    pop     %eax
    add     $3,%eax
    and     $-4,%eax
    jz      p3

#ifdef TCC_TARGET_PE
p1:
    cmp     $4096,%eax
    jbe     p2
    test    %eax,-4096(%esp)
    sub     $4096,%esp
    sub     $4096,%eax
    jmp p1
p2:
#endif

    sub     %eax,%esp
    mov     %esp,%eax
p3:
    push    %edx
    push    %edx
    ret

/* mark stack as nonexecutable */
#if defined __ELF__ && defined __linux__
    .section    .note.GNU-stack,"",@progbits
#endif
/* ---------------------------------------------- */
New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00			`/* ---------------------------------------------- */`
			`/* alloca86.S */`

drop alloca #define (Because GNU's alloca.h unconditionally #undef's alloca) Also, remove gcc specific sections in headers. and instead change tests such that gcc does not use them. 2009-05-17 04:30:13 +08:00			`.globl alloca`
New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00
drop alloca #define (Because GNU's alloca.h unconditionally #undef's alloca) Also, remove gcc specific sections in headers. and instead change tests such that gcc does not use them. 2009-05-17 04:30:13 +08:00			`alloca:`
New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00			`pop %edx`
			`pop %eax`
			`add $3,%eax`
			`and $-4,%eax`
			`jz p3`
Just warn about unknown directives, define __STDC_VERSION__=199901L 2008-01-17 04:16:35 +08:00
			`#ifdef TCC_TARGET_PE`
New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00			`p1:`
			`cmp $4096,%eax`
Fix mistake. Change jb by jbe. tiny c round (INT_MAX = 0x7FFFFFFF) to a DWORD boundary and it becomes 0x80000000. Jle treats as -214783648, but Jbe treats as 214783648. Thanks to Jason Hood for explain me this. 2014-07-11 08:41:51 +08:00			`jbe p2`
Fix problem using alloca function, executable crashed even with a exception handler function, when try to allocate INT_MAX. Patch provided by Jason Hood in private e-mail, when I ask to him for help. He say: Feel free to pass it on to the mailing list. 2014-07-10 12:37:20 +08:00			`test %eax,-4096(%esp)`
New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00			`sub $4096,%esp`
			`sub $4096,%eax`
			`jmp p1`
			`p2:`
Just warn about unknown directives, define __STDC_VERSION__=199901L 2008-01-17 04:16:35 +08:00			`#endif`

New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00			`sub %eax,%esp`
			`mov %esp,%eax`
			`p3:`
			`push %edx`
			`push %edx`
			`ret`

lib/alloca*: mark ELF stack access flags as nonexecutable Signed-off-by: Sergei Trofimovich <st@anti-virus.by> 2011-01-04 16:38:52 +08:00			`/* mark stack as nonexecutable */`
			`#if defined __ELF__ && defined __linux__`
			`.section .note.GNU-stack,"",@progbits`
			`#endif`
New files: alloca86.S alloca86-bt.S 2007-11-23 08:03:03 +08:00			`/* ---------------------------------------------- */`