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start: Copy the mips64 comment about gp to the mips32 code.

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Also, don't incorrectly claim that it's only needed for dynamic linking/PIC.
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Alex Rønne Petersen 2024-07-30 04:02:32 +02:00
parent 38e0f049c5
commit 78e581b86f
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1 changed files with 1 additions and 2 deletions
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lib/std/start.zig
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@ -293,6 +293,7 @@ fn _start() callconv(.Naked) noreturn {
\\ .gpword .
\\ .gpword %[posixCallMainAndExit]
\\ 1:
// The `gp` register on MIPS serves a similar purpose to `r2` (ToC pointer) on PPC64.
\\ lw $gp, 0($ra)
\\ subu $gp, $ra, $gp
\\ lw $25, 4($ra)
@ -314,8 +315,6 @@ fn _start() callconv(.Naked) noreturn {
\\ .gpdword %[posixCallMainAndExit]
\\ 1:
// The `gp` register on MIPS serves a similar purpose to `r2` (ToC pointer) on PPC64.
// We need to set it up in order for dynamically-linked / position-independent code to
// work.
\\ ld $gp, 0($ra)
\\ dsubu $gp, $ra, $gp
\\ ld $25, 8($ra)