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start: Align the stack on powerpc just in case.

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The kernel does this as required, but we cannot trust dynamic linkers to do it.
This commit is contained in:
Alex Rønne Petersen 2024-07-24 17:35:47 +02:00
parent 714e743393
commit 52653ec82b
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1 changed files with 3 additions and 2 deletions
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lib/std/start.zig
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@ -351,8 +351,9 @@ fn _start() callconv(.Naked) noreturn {
\\ j %[posixCallMainAndExit] \\ j %[posixCallMainAndExit]
, ,
.powerpc, .powerpcle => .powerpc, .powerpcle =>
// Setup the initial stack frame and clear the back chain pointer. // Set up the initial stack frame, and clear the back chain pointer.
\\ mr 3, 1 \\ mr 3, 1
\\ clrrwi 1, 1, 4
\\ li 0, 0 \\ li 0, 0
\\ stwu 1, -16(1) \\ stwu 1, -16(1)
\\ stw 0, 0(1) \\ stw 0, 0(1)
@ -360,7 +361,7 @@ fn _start() callconv(.Naked) noreturn {
\\ b %[posixCallMainAndExit] \\ b %[posixCallMainAndExit]
, ,
.powerpc64, .powerpc64le => .powerpc64, .powerpc64le =>
// Setup the initial stack frame and clear the back chain pointer. // Set up the ToC and initial stack frame, and clear the back chain pointer.
\\ addis 2, 12, .TOC. - %[_start]@ha \\ addis 2, 12, .TOC. - %[_start]@ha
\\ addi 2, 2, .TOC. - %[_start]@l \\ addi 2, 2, .TOC. - %[_start]@l
\\ mr 3, 1 \\ mr 3, 1