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| author | Andrew Kelley <andrew@ziglang.org> | 2024-08-01 01:34:33 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-08-01 01:34:33 -0700 |
| commit | 7a0da805a8d785a2c0bd9d50f01136dc7d190b46 (patch) | |
| tree | a5686535f532d743f849be808166921a5d5cc970 /lib/std/start.zig | |
| parent | 8f7cbaa4c0cebc22613a33d212569cf221d6a3df (diff) | |
| parent | 108c682df0ec6908695e55d3c3f50fe158a5d502 (diff) | |
| download | zig-7a0da805a8d785a2c0bd9d50f01136dc7d190b46.tar.gz zig-7a0da805a8d785a2c0bd9d50f01136dc7d190b46.zip | |
Merge pull request #20797 from alexrp/start-more-arches
`start`: Add POSIX arc, csky, and hexagon support
Diffstat (limited to 'lib/std/start.zig')
| -rw-r--r-- | lib/std/start.zig | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/std/start.zig b/lib/std/start.zig index c68dec4462..fd8661660b 100644 --- a/lib/std/start.zig +++ b/lib/std/start.zig @@ -259,6 +259,15 @@ fn _start() callconv(.Naked) noreturn { \\ and sp, x0, #-16 \\ b %[posixCallMainAndExit] , + .arc => + // The `arc` tag currently means ARCv2, which has an unusually low stack alignment + // requirement. ARCv3 increases it from 4 to 16, but we don't support ARCv3 yet. + \\ mov fp, 0 + \\ mov blink, 0 + \\ mov r0, sp + \\ and sp, sp, -4 + \\ b %[posixCallMainAndExit] + , .arm, .armeb, .thumb, .thumbeb => \\ mov fp, #0 \\ mov lr, #0 @@ -266,6 +275,33 @@ fn _start() callconv(.Naked) noreturn { \\ and sp, #-16 \\ b %[posixCallMainAndExit] , + // zig fmt: off + .csky => + if (builtin.position_independent_code) + // The CSKY ABI assumes that `gb` is set to the address of the GOT in order for + // position-independent code to work. We depend on this in `std.os.linux.start_pie` + // to locate `_DYNAMIC` as well. + \\ grs t0, 1f + \\ 1: + \\ lrw gb, 1b@GOTPC + \\ addu gb, t0 + else "" + ++ + \\ movi lr, 0 + \\ mov a0, sp + \\ andi sp, sp, -8 + \\ jmpi %[posixCallMainAndExit] + , + // zig fmt: on + .hexagon => + // r29 = SP, r30 = FP + \\ r30 = #0 + \\ r0 = r29 + \\ r29 = and(r29, #-16) + \\ memw(r29 + #-8) = r29 + \\ r29 = add(r29, #-8) + \\ call %[posixCallMainAndExit] + , .loongarch32, .loongarch64 => \\ move $fp, $zero \\ move $a0, $sp |