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Merge pull request #20733 from alexrp/start-porting

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`start`: Add startup code for loongarch64, m68k, and s390x
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Andrew Kelley 2024-07-22 18:25:24 -07:00 committed by GitHub
commit 8a8a7ba35b
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1 changed files with 27 additions and 3 deletions
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30
lib/std/start.zig
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@ -300,6 +300,12 @@ fn _start() callconv(.Naked) noreturn {
\\ and sp, #-16
\\ b %[posixCallMainAndExit]
,
.loongarch64 =>
\\ move $fp, $zero
\\ move $a0, $sp
\\ bstrins.d $sp, $zero, 3, 0
\\ b %[posixCallMainAndExit]
,
.riscv64 =>
\\ li s0, 0
\\ li ra, 0
@ -307,6 +313,14 @@ fn _start() callconv(.Naked) noreturn {
\\ andi sp, sp, -16
\\ tail %[posixCallMainAndExit]@plt
,
.m68k =>
// Note that the - 8 is needed because pc in the jsr instruction points into the middle
// of the jsr instruction. (The lea is 6 bytes, the jsr is 4 bytes.)
\\ suba.l %%fp, %%fp
\\ move.l %%sp, -(%%sp)
\\ lea %[posixCallMainAndExit] - . - 8, %%a0
\\ jsr (%%pc, %%a0)
,
.mips, .mipsel =>
// The lr is already zeroed on entry, as specified by the ABI.
\\ addiu $fp, $zero, 0
@ -340,8 +354,8 @@ fn _start() callconv(.Naked) noreturn {
,
.powerpc64, .powerpc64le =>
// Setup the initial stack frame and clear the back chain pointer.
\\ addis 2, 12, .TOC. - _start@ha
\\ addi 2, 2, .TOC. - _start@l
\\ addis 2, 12, .TOC. - %[_start]@ha
\\ addi 2, 2, .TOC. - %[_start]@l
\\ mr 3, 1
\\ clrrdi 1, 1, 4
\\ li 0, 0
@ -349,6 +363,15 @@ fn _start() callconv(.Naked) noreturn {
\\ mtlr 0
\\ b %[posixCallMainAndExit]
,
.s390x =>
// Set up the stack frame (register save area and cleared back-chain slot).
// Note: Stack pointer is guaranteed by ABI to be 8-byte aligned as required.
\\ lgr %r2, %r15
\\ aghi %r15, -160
\\ lghi %r0, 0
\\ stg %r0, 0(%r15)
\\ jg %[posixCallMainAndExit]
,
.sparc64 =>
// argc is stored after a register window (16 registers) plus stack bias
\\ mov %%g0, %%i6
@ -359,7 +382,8 @@ fn _start() callconv(.Naked) noreturn {
else => @compileError("unsupported arch"),
}
:
: [posixCallMainAndExit] "X" (&posixCallMainAndExit),
: [_start] "X" (_start),
[posixCallMainAndExit] "X" (&posixCallMainAndExit),
);
}