Hojun-Cho
1657bdeda3
C bootstrap (phases 0-9):
cmd/wwc, cmd/6c, cmd/6a, cmd/6l, cmd/ww, rt, lib/*.
ww-side self-host (phase 10):
selfhost/cmd/wwc — ww-cgen frontend; bootstrap fixed point.
selfhost/cmd/6a — assembler; byte-identical to C 6a (test 991).
selfhost/cmd/6l — linker w/ archive (.a) support; byte-identical
to C 6l (test 992).
selfhost/cmd/ww — driver (build/run/version); byte-identical to
C ww (test 993).
make test: 15/15. make bootstrap: ww2.s == ww3.s, ww2.o == ww3.o,
ww2 == ww3 byte-identical, with the full ww-tooled chain.
17 lines
557 B
ArmAsm
17 lines
557 B
ArmAsm
// rt/start.s — process entry. Linux sets up the stack so that on
|
|
// entry [SP] holds argc, [SP+8] starts argv (NULL-terminated array
|
|
// of *u8), [SP+8+(argc+1)*8] starts envp.
|
|
//
|
|
// We pull argc into DI and the argv pointer into SI, then jump to
|
|
// `main`. ww programs that declare `fn main(argc: i32, argv: **u8)
|
|
// i32` see them; programs declaring `fn main() i32` simply ignore
|
|
// the regs. Either way, main's return value is fed to the exit
|
|
// syscall.
|
|
TEXT _start,$0
|
|
MOVQ (SP), DI
|
|
LEAQ 8(SP), SI
|
|
CALL main(SB)
|
|
MOVQ AX, DI
|
|
MOVQ $60, AX
|
|
SYSCALL
|