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Merge pull request #20749 from alexrp/start-pie

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`std.os.linux.start_pie`: Implement `getDynamicSymbol()` for loongarch64, m68k, and s390x
This commit is contained in:
Andrew Kelley
2024-07-24 10:27:20 -07:00
committed by GitHub
parent 557c4f04c2 1c6bee0834
commit 4de8bba648
1 changed files with 31 additions and 0 deletions
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31
lib/std/os/linux/start_pie.zig
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@@ -7,7 +7,10 @@ const R_AMD64_RELATIVE = 8;
const R_386_RELATIVE = 8;
const R_ARM_RELATIVE = 23;
const R_AARCH64_RELATIVE = 1027;
const R_LARCH_RELATIVE = 3;
const R_68K_RELATIVE = 22;
const R_RISCV_RELATIVE = 3;
const R_390_RELATIVE = 12;
const R_SPARC_RELATIVE = 22;
const R_RELATIVE = switch (builtin.cpu.arch) {
@@ -15,7 +18,10 @@ const R_RELATIVE = switch (builtin.cpu.arch) {
.x86_64 => R_AMD64_RELATIVE,
.arm => R_ARM_RELATIVE,
.aarch64 => R_AARCH64_RELATIVE,
.loongarch32, .loongarch64 => R_LARCH_RELATIVE,
.m68k => R_68K_RELATIVE,
.riscv64 => R_RISCV_RELATIVE,
.s390x => R_390_RELATIVE,
else => @compileError("Missing R_RELATIVE definition for this target"),
};
@@ -57,12 +63,37 @@ fn getDynamicSymbol() [*]elf.Dyn {
\\ add %[ret], %[ret], #:lo12:_DYNAMIC
: [ret] "=r" (-> [*]elf.Dyn),
),
.loongarch32, .loongarch64 => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ la.local %[ret], _DYNAMIC
: [ret] "=r" (-> [*]elf.Dyn),
),
// Note that the - 8 is needed because pc in the second lea instruction points into the
// middle of that instruction. (The first lea is 6 bytes, the second is 4 bytes.)
.m68k => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ lea _DYNAMIC - . - 8, %[ret]
\\ lea (%[ret], %%pc), %[ret]
: [ret] "=r" (-> [*]elf.Dyn),
),
.riscv64 => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ lla %[ret], _DYNAMIC
: [ret] "=r" (-> [*]elf.Dyn),
),
.s390x => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ larl %[ret], 1f
\\ agf %[ret], 0(%[ret])
\\ b 2f
\\ 1: .long _DYNAMIC - .
\\ 2:
: [ret] "=r" (-> [*]elf.Dyn),
),
else => {
@compileError("PIE startup is not yet supported for this target!");
},