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start: Simplify mips and mips64 startup code.

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Switches from using r1 as a temporary to r2. That way, we don't have to set the
`noat` assembler option. (r1 is the scratch register used by the assembler's
pseudoinstructions; the assembler warns when code uses that register explicitly
without `noat` set.)
This commit is contained in:
Alex Rønne Petersen 2024-07-24 18:35:20 +02:00
parent 47c0464e86
commit 5478b0eb38
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1 changed files with 2 additions and 10 deletions
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12
lib/std/start.zig
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@ -332,22 +332,14 @@ fn _start() callconv(.Naked) noreturn {
\\ move $fp, $0
\\ move $ra, $0
\\ move $a0, $sp
\\ .set push
\\ .set noat
\\ addiu $1, $zero, -16
\\ and $sp, $sp, $1
\\ .set pop
\\ and $sp, -16
\\ j %[posixCallMainAndExit]
,
.mips64, .mips64el =>
\\ move $fp, $0
\\ move $ra, $0
\\ move $a0, $sp
\\ .set push
\\ .set noat
\\ daddiu $1, $zero, -16
\\ and $sp, $sp, $1
\\ .set pop
\\ and $sp, -16
\\ j %[posixCallMainAndExit]
,
.powerpc, .powerpcle =>