boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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pthread_arch.h (471B)

      1 /* tcc-build aarch64 pthread_arch.h replacement.
      2  *
      3  * Stock musl emits `mrs %0, tpidr_el0` as inline asm with output
      4  * operand. tcc 0.9.26's arm64-asm.c phase 1+2 has no operand
      5  * constraint plumbing, so route through extern __get_tp implemented
      6  * in src/internal/aarch64/get_tp.s. Single-instruction overhead;
      7  * inlining is recovered by phase 3 once it lands. */
      8 
      9 extern unsigned long __get_tp(void);
     10 
     11 #define TLS_ABOVE_TP
     12 #define GAP_ABOVE_TP 16
     13 
     14 #define MC_PC pc