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start: Set up the gp register on mips and mips64.

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Alex Rønne Petersen 2024-07-25 01:08:03 +02:00
parent 66b71273a2
commit 77fc3b88fb
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1 changed files with 13 additions and 0 deletions
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13
lib/std/start.zig
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@ -329,6 +329,11 @@ fn _start() callconv(.Naked) noreturn {
\\ jsr (%%pc, %%a0)
,
.mips, .mipsel =>
\\ bal 1f
\\ .gpword .
\\ 1:
\\ lw $gp, 0($ra)
\\ subu $gp, $ra, $gp
\\ move $fp, $0
\\ move $ra, $0
\\ move $a0, $sp
@ -336,6 +341,14 @@ fn _start() callconv(.Naked) noreturn {
\\ j %[posixCallMainAndExit]
,
.mips64, .mips64el =>
\\ bal 1f
\\ .gpdword .
\\ 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
\\ move $fp, $0
\\ move $ra, $0
\\ move $a0, $sp