boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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boot4-musl-shim-aarch64.h (911B)

      1 /* boot4 va_list shim for compiling musl with tcc 0.9.26 on aarch64.
      2  *
      3  * Mirrors tcc 0.9.26's <stdarg.h> aarch64 block: __va_list_struct is
      4  * the AAPCS register-save area (stack ptr, GR/VR tops, GR/VR offsets);
      5  * va_list is an array-of-1 of that struct so it decays to pointer at
      6  * use sites. tcc routes va_start/va_arg through the __va_start /
      7  * __va_arg frontend intrinsics directly (no decomposition into
      8  * size/align/type-tag like the x86_64 path).
      9  *
     10  * Untested — see docs/MUSL.md "multi-arch status". */
     11 
     12 typedef struct {
     13     void *__stack;
     14     void *__gr_top;
     15     void *__vr_top;
     16     int   __gr_offs;
     17     int   __vr_offs;
     18 } __va_list_struct;
     19 
     20 typedef __va_list_struct __builtin_va_list[1];
     21 
     22 #define __builtin_va_start(ap, last) __va_start(ap, last)
     23 #define __builtin_va_arg(ap, type)   __va_arg(ap, type)
     24 #define __builtin_va_copy(dest, src) ((dest)[0] = (src)[0])
     25 #define __builtin_va_end(ap)