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Merge pull request #20776 from alexrp/start-pie-more-arches

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`std.os.linux.start_pie`: Add arc, csky, and hexagon support (and arm variants)
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Andrew Kelley
2024-07-25 19:33:54 -07:00
committed by GitHub
parent 2458e53e73 38c492bb53
commit f2bf6c1b11
1 changed files with 37 additions and 4 deletions
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41
lib/std/os/linux/start_pie.zig
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@@ -5,8 +5,11 @@ const assert = std.debug.assert;
const R_AMD64_RELATIVE = 8;
const R_386_RELATIVE = 8;
const R_ARC_RELATIVE = 56;
const R_ARM_RELATIVE = 23;
const R_AARCH64_RELATIVE = 1027;
const R_CSKY_RELATIVE = 9;
const R_HEXAGON_RELATIVE = 35;
const R_LARCH_RELATIVE = 3;
const R_68K_RELATIVE = 22;
const R_RISCV_RELATIVE = 3;
@@ -16,8 +19,11 @@ const R_SPARC_RELATIVE = 22;
const R_RELATIVE = switch (builtin.cpu.arch) {
.x86 => R_386_RELATIVE,
.x86_64 => R_AMD64_RELATIVE,
.arm => R_ARM_RELATIVE,
.aarch64 => R_AARCH64_RELATIVE,
.arc => R_ARC_RELATIVE,
.arm, .armeb, .thumb, .thumbeb => R_ARM_RELATIVE,
.aarch64, .aarch64_be => R_AARCH64_RELATIVE,
.csky => R_CSKY_RELATIVE,
.hexagon => R_HEXAGON_RELATIVE,
.loongarch32, .loongarch64 => R_LARCH_RELATIVE,
.m68k => R_68K_RELATIVE,
.riscv64 => R_RISCV_RELATIVE,
@@ -44,8 +50,14 @@ fn getDynamicSymbol() [*]elf.Dyn {
\\ lea _DYNAMIC(%%rip), %[ret]
: [ret] "=r" (-> [*]elf.Dyn),
),
.arc => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ add %[ret], pcl, _DYNAMIC@pcl
: [ret] "=r" (-> [*]elf.Dyn),
),
// Work around the limited offset range of `ldr`
.arm => asm volatile (
.arm, .armeb, .thumb, .thumbeb => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ ldr %[ret], 1f
@@ -56,13 +68,34 @@ fn getDynamicSymbol() [*]elf.Dyn {
: [ret] "=r" (-> [*]elf.Dyn),
),
// A simple `adr` is not enough as it has a limited offset range
.aarch64 => asm volatile (
.aarch64, .aarch64_be => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ adrp %[ret], _DYNAMIC
\\ add %[ret], %[ret], #:lo12:_DYNAMIC
: [ret] "=r" (-> [*]elf.Dyn),
),
// 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 (
\\ mov %[ret], gb
\\ ldw %[ret], %[ret]
: [ret] "=r" (-> [*]elf.Dyn),
),
.hexagon => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC
\\ jump 1f
\\ .word _DYNAMIC - .
\\ 1:
\\ r1 = pc
\\ r1 = add(r1, #-4)
\\ %[ret] = memw(r1)
\\ %[ret] = add(r1, %[ret])
: [ret] "=r" (-> [*]elf.Dyn),
:
: "r1"
),
.loongarch32, .loongarch64 => asm volatile (
\\ .weak _DYNAMIC
\\ .hidden _DYNAMIC