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lib: define va_* for bootstrappable tcc in riscv 

Bootstrappable TCC needs some extra definitions that upstream TCC
obtains from `tccdefs.h` in its codebase, which is also injected in the
binary using a weird trick (see `c2str` in tcc's codebase).

* include/stdarg.h: Add definitions for variable length arguments.
This commit is contained in:
Ekaitz 2023-10-11 15:53:08 +02:00
parent c288c35657
commit 925db84523
1 changed files with 15 additions and 0 deletions
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15
include/stdarg.h
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@ -32,6 +32,21 @@
// GCC on RISC-V always passes arguments in registers. Implementing these macros without
// the use of built-ins would be very involved.
// TINYCC tries to be GCC compatible in this case.
#if __TINYC__ < 928
// Bootstrappable TINYCC (version < 928) needs some definitions in RISC-V
typedef char *__builtin_va_list;
#define __va_reg_size (__riscv_xlen >> 3)
#define _tcc_align(addr,type) (((unsigned long)addr + __alignof__(type) - 1) \
& -(__alignof__(type)))
#define __builtin_va_arg(ap,type) (*(sizeof(type) > (2*__va_reg_size) ? *(type **)((ap += __va_reg_size) - __va_reg_size) : (ap = (va_list)(_tcc_align(ap,type) + (sizeof(type)+__va_reg_size - 1)& -__va_reg_size), (type *)(ap - ((sizeof(type)+ __va_reg_size - 1)& -__va_reg_size)))))
#define __builtin_va_end(ap) (void)(ap)
#ifndef __builtin_va_copy
# define __builtin_va_copy(dest, src) (dest) = (src)
#endif
#endif
typedef __builtin_va_list va_list;
#define va_start(v,l) __builtin_va_start(v,l)