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Remove some legacy cruft

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Function trace logs will report stack usage accurately. It won't include
the argv/environ block. Our clone() polyfill is now simpler and does not
use as much stack memory. Function call tracing on x86 is now faster too
This commit is contained in:
Justine Tunney 2025-01-02 18:44:07 -08:00
parent 8db646f6b2
commit a15958edc6
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GPG key ID: BE714B4575D6E328
21 changed files with 291 additions and 467 deletions
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9
libc/runtime/clone-linux.S
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@ -26,7 +26,7 @@
// @param rdx x2 is ptid
// @param rcx x3 is ctid
// @param r8 x4 is tls
// @param r9 x5 is func(void*,int)→int
// @param r9 x5 is func(void*)→int
// @param 8(rsp) x6 is arg
// @return tid of child on success, or -errno on error
sys_clone_linux:
@ -45,16 +45,10 @@ sys_clone_linux:
ret
2: xor %ebp,%ebp // child thread
mov %rbx,%rdi // arg
mov %r10,%r15 // experiment
mov (%r10),%esi // tid
call *%r9 // func(arg,tid)
xchg %eax,%edi // func(arg,tid) → exitcode
mov (%r15),%eax // experiment
test %eax,%eax // experiment
jz 1f // experiment
mov $60,%eax // __NR_exit(exitcode)
syscall
1: hlt // ctid was corrupted by program!
#elif defined(__aarch64__)
stp x29,x30,[sp,#-16]!
mov x29,sp
@ -69,7 +63,6 @@ sys_clone_linux:
2: mov x29,#0 // wipe backtrace
mov x28,x3 // set cosmo tls
mov x0,x6 // child thread
ldr w1,[x4] // arg2 = *ctid
blr x5
mov x8,#93 // __NR_exit
svc #0