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Copy over ppc clone from musl

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This commit is contained in:
Benjamin Feng 2021-04-08 23:10:42 -05:00
parent df910b33f4
commit b409accc96
1 changed files with 65 additions and 0 deletions
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65
lib/std/special/c.zig
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@ -491,6 +491,71 @@ fn clone() callconv(.Naked) void {
\\ syscall
);
},
.powerpc => {
// __clone(func, stack, flags, arg, ptid, tls, ctid)
// 3, 4, 5, 6, 7, 8, 9
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
// 0 3, 4, 5, 6, 7
asm volatile (
\\# store non-volatile regs r30, r31 on stack in order to put our
\\# start func and its arg there
\\stwu 30, -16(1)
\\stw 31, 4(1)
\\
\\# save r3 (func) into r30, and r6(arg) into r31
\\mr 30, 3
\\mr 31, 6
\\
\\# create initial stack frame for new thread
\\clrrwi 4, 4, 4
\\li 0, 0
\\stwu 0, -16(4)
\\
\\#move c into first arg
\\mr 3, 5
\\#mr 4, 4
\\mr 5, 7
\\mr 6, 8
\\mr 7, 9
\\
\\# move syscall number into r0
\\li 0, 120
\\
\\sc
\\
\\# check for syscall error
\\bns+ 1f # jump to label 1 if no summary overflow.
\\#else
\\neg 3, 3 #negate the result (errno)
\\1:
\\# compare sc result with 0
\\cmpwi cr7, 3, 0
\\
\\# if not 0, jump to end
\\bne cr7, 2f
\\
\\#else: we're the child
\\#call funcptr: move arg (d) into r3
\\mr 3, 31
\\#move r30 (funcptr) into CTR reg
\\mtctr 30
\\# call CTR reg
\\bctrl
\\# mov SYS_exit into r0 (the exit param is already in r3)
\\li 0, 1
\\sc
\\
\\2:
\\
\\# restore stack
\\lwz 30, 0(1)
\\lwz 31, 4(1)
\\addi 1, 1, 16
\\
\\blr
);
},
.powerpc64, .powerpc64le => {
// __clone(func, stack, flags, arg, ptid, tls, ctid)
// 3, 4, 5, 6, 7, 8, 9