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std.pie: add missing clobbers on alpha and sparc

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Also format all the assembly code in the file.
This commit is contained in:
Alex Rønne Petersen 2025-11-13 20:19:22 +01:00
parent 9ab7eec23e
commit 94538d8dd2
1 changed files with 17 additions and 13 deletions
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30
lib/std/pie.zig
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@ -56,8 +56,9 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ call 1f
\\ 1: pop %[ret]
\\ lea _DYNAMIC-1b(%[ret]), %[ret]
\\1:
\\ pop %[ret]
\\ lea _DYNAMIC - 1b(%[ret]), %[ret]
: [ret] "=r" (-> [*]const elf.Dyn),
),
.x86_64 => asm volatile (
@ -79,8 +80,9 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ ldr %[ret], 1f
\\ add %[ret], pc
\\ b 2f
\\ 1: .word _DYNAMIC-1b
\\ 2:
\\1:
\\ .word _DYNAMIC-1b
\\2:
: [ret] "=r" (-> [*]const elf.Dyn),
),
// A simple `adr` is not enough as it has a limited offset range
@ -99,7 +101,7 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ ldq %[ret], -0x8000($29)
: [ret] "=r" (-> [*]const elf.Dyn),
:
: .{ .r26 = true }),
: .{ .r26 = true, .r29 = true }),
// The CSKY ABI requires the gb register to point to the GOT. Additionally, the first
// entry in the GOT is defined to hold the address of _DYNAMIC.
.csky => asm volatile (
@ -112,7 +114,7 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ .hidden _DYNAMIC
\\ jump 1f
\\ .word _DYNAMIC - .
\\ 1:
\\1:
\\ r1 = pc
\\ r1 = add(r1, #-4)
\\ %[ret] = memw(r1)
@ -198,7 +200,7 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ .hidden _DYNAMIC
\\ bl 1f
\\ .long _DYNAMIC - .
\\ 1:
\\1:
\\ mflr %[ret]
\\ lwz 4, 0(%[ret])
\\ add %[ret], 4, %[ret]
@ -210,7 +212,7 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ .hidden _DYNAMIC
\\ bl 1f
\\ .quad _DYNAMIC - .
\\ 1:
\\1:
\\ mflr %[ret]
\\ ld 4, 0(%[ret])
\\ add %[ret], 4, %[ret]
@ -229,8 +231,9 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ larl %[ret], 1f
\\ ag %[ret], 0(%[ret])
\\ jg 2f
\\ 1: .quad _DYNAMIC - .
\\ 2:
\\1:
\\ .quad _DYNAMIC - .
\\2:
: [ret] "=a" (-> [*]const elf.Dyn),
),
.sh, .sheb => asm volatile (
@ -252,11 +255,12 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
.sparc, .sparc64 => asm volatile (
\\ sethi %%hi(_GLOBAL_OFFSET_TABLE_ - 4), %%l7
\\ call 1f
\\ add %%l7, %%lo(_GLOBAL_OFFSET_TABLE_ + 4), %%l7
\\ 1:
\\ add %%l7, %%lo(_GLOBAL_OFFSET_TABLE_ + 4), %%l7
\\1:
\\ add %%l7, %%o7, %[ret]
: [ret] "=r" (-> [*]const elf.Dyn),
),
:
: .{ .l7 = true }),
else => {
@compileError("PIE startup is not yet supported for this target!");
},