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std: Fix stack overflow in SPARC clone() impl

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Leave the minimum amount of stack space required by the ABI (16 * 8
bytes for the window contents plus 6 * 8 bytes for the input arguments)
on the new thread stack.
This commit is contained in:
LemonBoy 2021-05-01 11:02:04 +02:00
parent 807bb7c03f
commit 51f80deaf6
1 changed files with 7 additions and 6 deletions
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13
lib/std/special/c.zig
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@ -614,23 +614,24 @@ fn clone() callconv(.Naked) void {
\\ # Shuffle the arguments
\\ mov 217, %%g1
\\ mov %%i2, %%o0
\\ sub %%i1, 2047, %%o1
\\ # Add some extra space for the initial frame
\\ sub %%i1, 176 + 2047, %%o1
\\ mov %%i4, %%o2
\\ mov %%i5, %%o3
\\ ldx [%%fp + 192 - 2*8 + 2047], %%o4
\\ ldx [%%fp + 0x8af], %%o4
\\ t 0x6d
\\ bcs,pn %%xcc, 2f
\\ nop
\\ # sparc64 returns the child pid in o0 and a flag telling
\\ # whether the process is the child in o1
\\ # The child pid is returned in o0 while o1 tells if this
\\ # process is # the child (=1) or the parent (=0).
\\ brnz %%o1, 1f
\\ nop
\\ # This is the parent process, return the child pid
\\ # Parent process, return the child pid
\\ mov %%o0, %%i0
\\ ret
\\ restore
\\1:
\\ # This is the child process
\\ # Child process, call func(arg)
\\ mov %%g0, %%fp
\\ call %%g2
\\ mov %%g3, %%o0