mirror of
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d9a6d9aec0
Revert "Add support to debug libtcc code" - not fully developed experimental feature This reverts commit1fe3e3bff5. This reverts commit4768b11737. Revert "tests: add test for x86_64 xor REX prefix bug in load()" - AI generated nonsense test This reverts commitd5ecb52a71. Revert "tccpp.c: Improve integer constant overflow warning" - Too long and confusing messages and comments for feature with questionable benefit. This reverts commit085bdf8997. riscv64-link: - cleanup "pair pcrel lo relocations by hi address" Fromfada98b1cetccgen.c: - Simplify "Cast signed pointer offset to ptrdiff_t before performing arithmetic" From5ad52cc1edlibtcc.c: - Revert "tcc options: document behavior and clashes (no-op)" a bit more information than one would like to have I think. (why try to understand that comments plus the extra script if one can as well just read the code itself ;) From234e2dd2bftccdefs.h: - Revert "Move lib/va_list.c into include/tccdefs.h" Lets not fill tccdefs.h with too much inline code Also, -nostdlib -run is no longer supported Fromfa6a6bfbbdarm64-gen.c: - cleanup "Implement TOK_NEG for floats natively" Also, make it "no lvalue" in tccgen.c/x86-64-gen.c Fromc39eaf10cflib/lib-arm64.c: - cleanup "Remove libc dependency from lib-arm64" using unions is much faster than some made up memcpy() From8c61b91de8
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/* va_list.c - tinycc support for va_list on X86_64 */
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#if defined __x86_64__
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/* Avoid include files, they may not be available when cross compiling */
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extern void abort(void);
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/* This should be in sync with our include/stdarg.h */
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enum __va_arg_type {
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__va_gen_reg, __va_float_reg, __va_stack
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};
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/* GCC compatible definition of va_list. */
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/*predefined by TCC (tcc_predefs.h):
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typedef struct {
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unsigned int gp_offset;
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unsigned int fp_offset;
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union {
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unsigned int overflow_offset;
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char *overflow_arg_area;
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};
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char *reg_save_area;
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} __builtin_va_list[1];
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*/
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extern void *memcpy(void *dest, const void *src, unsigned long n);
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void *__va_arg(__builtin_va_list ap,
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int arg_type,
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int size, int align)
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{
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size = (size + 7) & ~7;
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align = (align + 7) & ~7;
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switch ((enum __va_arg_type)arg_type) {
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case __va_gen_reg:
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if (ap->gp_offset + size <= 48) {
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ap->gp_offset += size;
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return ap->reg_save_area + ap->gp_offset - size;
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}
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goto use_overflow_area;
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case __va_float_reg:
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if (ap->fp_offset < 128 + 48) {
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ap->fp_offset += 16;
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if (size == 8)
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return ap->reg_save_area + ap->fp_offset - 16;
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if (ap->fp_offset < 128 + 48) {
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memcpy(ap->reg_save_area + ap->fp_offset - 8,
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ap->reg_save_area + ap->fp_offset, 8);
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ap->fp_offset += 16;
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return ap->reg_save_area + ap->fp_offset - 32;
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}
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}
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goto use_overflow_area;
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case __va_stack:
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use_overflow_area:
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ap->overflow_arg_area += size;
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ap->overflow_arg_area = (char*)((long long)(ap->overflow_arg_area + align - 1) & -align);
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return ap->overflow_arg_area - size;
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default: /* should never happen */
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abort();
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return 0;
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}
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}
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#endif
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