swtch saves callee-saved registers
swtch idles on per-CPU stack, not on calling process's stack fix pipe bugs usertest.c tests pipes, fork, exit, close
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14 changed files with 220 additions and 63 deletions
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@ -5,3 +5,4 @@
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#define SYS_pipe 5
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#define SYS_write 6
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#define SYS_read 7
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#define SYS_close 8
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