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.
25 lines
742 B
ArmAsm
25 lines
742 B
ArmAsm
// rt/alloc.s — page allocator via the mmap syscall.
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//
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// rt_alloc(n: u64) returns a *void aligned at a page boundary, sized
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// to the next page multiple. Pair with rt_free(p, n).
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//
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// We pin to PROT_READ|PROT_WRITE and MAP_PRIVATE|MAP_ANONYMOUS so
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// callers never have to plumb file descriptors through.
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TEXT rt_alloc,$0
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MOVQ DI, SI // arg 1: length = caller's n
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MOVQ $0, DI // arg 0: addr = NULL (kernel chooses)
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MOVQ $3, DX // arg 2: prot = R|W
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MOVQ $34, R10 // arg 3: flags = MAP_PRIVATE|MAP_ANON
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MOVQ $-1, R8 // arg 4: fd = -1
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MOVQ $0, R9 // arg 5: offset = 0
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MOVQ $9, AX // syscall: mmap
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SYSCALL
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RET
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TEXT rt_free,$0
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// DI already holds ptr, SI already holds length
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MOVQ $11, AX // syscall: munmap
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SYSCALL
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RET
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