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Move lib/va_list.c into include/tccdefs.h

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This makes code with va_arg work with -nostdlib on x86_64.
This commit is contained in:
herman ten brugge
2025-11-19 08:31:15 +01:00
parent 3e8f1da9c5
commit fa6a6bfbbd
3 changed files with 43 additions and 71 deletions
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43
include/tccdefs.h
View File

@@ -191,7 +191,10 @@
#if defined __x86_64__
#if !defined _WIN32
/* GCC compatible definition of va_list. */
/* This should be in sync with the declaration in our lib/libtcc1.c */
enum __va_arg_type {
__va_gen_reg, __va_float_reg, __va_stack
};
typedef struct {
unsigned gp_offset, fp_offset;
union {
@@ -201,7 +204,43 @@
char *reg_save_area;
} __builtin_va_list[1];
void *__va_arg(__builtin_va_list ap, int arg_type, int size, int align);
static inline void *__va_arg(__builtin_va_list ap, int arg_type,
int size, int align)
{
size = (size + 7) & ~7;
align = (align + 7) & ~7;
switch ((enum __va_arg_type)arg_type) {
case __va_gen_reg:
if (ap->gp_offset + size <= 48) {
ap->gp_offset += size;
return ap->reg_save_area + ap->gp_offset - size;
}
goto use_overflow_area;
case __va_float_reg:
if (ap->fp_offset < 128 + 48) {
ap->fp_offset += 16;
if (size == 8)
return ap->reg_save_area + ap->fp_offset - 16;
if (ap->fp_offset < 128 + 48) {
double *p = (double *)(ap->reg_save_area + ap->fp_offset);
p[-1] = p[0];
ap->fp_offset += 16;
return ap->reg_save_area + ap->fp_offset - 32;
}
}
goto use_overflow_area;
case __va_stack:
use_overflow_area:
ap->overflow_arg_area += size;
ap->overflow_arg_area =
(char*)((long long)(ap->overflow_arg_area + align - 1) & -align);
return ap->overflow_arg_area - size;
default: /* should never happen */
char *a = (char *)0; *a = 0; // abort
return 0;
}
}
#define __builtin_va_start(ap, last) \
(*(ap) = *(__builtin_va_list)((char*)__builtin_frame_address(0) - 24))
#define __builtin_va_arg(ap, t) \

4
lib/Makefile
View File

@@ -59,8 +59,8 @@ $(Cbc)COMMON_O += bcheck.o
EXTRA_O = runmain.o bt-exe.o bt-dll.o bt-log.o bcheck.o
OBJ-i386 = $(I386_O) $(LIN_O)
OBJ-x86_64 = $(X86_64_O) va_list.o $(LIN_O)
OBJ-x86_64-osx = $(X86_64_O) va_list.o $(OSX_O)
OBJ-x86_64 = $(X86_64_O) $(LIN_O)
OBJ-x86_64-osx = $(X86_64_O) $(OSX_O)
OBJ-i386-win32 = $(I386_O) chkstk.o $(WIN_O)
OBJ-x86_64-win32 = $(X86_64_O) chkstk.o $(WIN_O)
OBJ-arm64 = $(ARM64_O) $(LIN_O)

67
lib/va_list.c
View File

@@ -1,67 +0,0 @@
/* va_list.c - tinycc support for va_list on X86_64 */
#if defined __x86_64__
/* Avoid include files, they may not be available when cross compiling */
extern void abort(void);
/* This should be in sync with our include/stdarg.h */
enum __va_arg_type {
__va_gen_reg, __va_float_reg, __va_stack
};
/* GCC compatible definition of va_list. */
/*predefined by TCC (tcc_predefs.h):
typedef struct {
unsigned int gp_offset;
unsigned int fp_offset;
union {
unsigned int overflow_offset;
char *overflow_arg_area;
};
char *reg_save_area;
} __builtin_va_list[1];
*/
extern void *memcpy(void *dest, const void *src, unsigned long n);
void *__va_arg(__builtin_va_list ap,
int arg_type,
int size, int align)
{
size = (size + 7) & ~7;
align = (align + 7) & ~7;
switch ((enum __va_arg_type)arg_type) {
case __va_gen_reg:
if (ap->gp_offset + size <= 48) {
ap->gp_offset += size;
return ap->reg_save_area + ap->gp_offset - size;
}
goto use_overflow_area;
case __va_float_reg:
if (ap->fp_offset < 128 + 48) {
ap->fp_offset += 16;
if (size == 8)
return ap->reg_save_area + ap->fp_offset - 16;
if (ap->fp_offset < 128 + 48) {
memcpy(ap->reg_save_area + ap->fp_offset - 8,
ap->reg_save_area + ap->fp_offset, 8);
ap->fp_offset += 16;
return ap->reg_save_area + ap->fp_offset - 32;
}
}
goto use_overflow_area;
case __va_stack:
use_overflow_area:
ap->overflow_arg_area += size;
ap->overflow_arg_area = (char*)((long long)(ap->overflow_arg_area + align - 1) & -align);
return ap->overflow_arg_area - size;
default: /* should never happen */
abort();
return 0;
}
}
#endif