| Adds outline atomics support to Rust's compiler-rt build, since this is required |
| with a sufficiently new version of clang. Support for these hasn't reached a |
| stable version of LLVM yet, so we need to pick the changes and the corresponding |
| build logic in. |
| |
| diff --git a/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S b/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S |
| new file mode 100644 |
| index 000000000..5dc0d5320 |
| --- /dev/null |
| +++ b/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S |
| @@ -0,0 +1,236 @@ |
| +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| +// See https://llvm.org/LICENSE.txt for license information. |
| +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| + |
| +#include "assembly.h" |
| + |
| +// Out-of-line LSE atomics helpers. Ported from libgcc library. |
| +// N = {1, 2, 4, 8} |
| +// M = {1, 2, 4, 8, 16} |
| +// ORDER = {'relax', 'acq', 'rel', 'acq_rel'} |
| +// Routines implemented: |
| +// |
| +// iM __aarch64_casM_ORDER(iM expected, iM desired, iM *ptr) |
| +// iN __aarch64_swpN_ORDER(iN val, iN *ptr) |
| +// iN __aarch64_ldaddN_ORDER(iN val, iN *ptr) |
| +// iN __aarch64_ldclrN_ORDER(iN val, iN *ptr) |
| +// iN __aarch64_ldeorN_ORDER(iN val, iN *ptr) |
| +// iN __aarch64_ldsetN_ORDER(iN val, iN *ptr) |
| +// |
| +// Routines may modify temporary registers tmp0, tmp1, tmp2, |
| +// return value x0 and the flags only. |
| + |
| +#ifdef __aarch64__ |
| + |
| +#ifdef HAS_ASM_LSE |
| +.arch armv8-a+lse |
| +#else |
| +.arch armv8-a |
| +#endif |
| + |
| +#if !defined(__APPLE__) |
| +HIDDEN(__aarch64_have_lse_atomics) |
| +#else |
| +HIDDEN(___aarch64_have_lse_atomics) |
| +#endif |
| + |
| +// Generate mnemonics for |
| +// L_cas: SIZE: 1,2,4,8,16 MODEL: 1,2,3,4 |
| +// L_swp L_ldadd L_ldclr L_ldeor L_ldset: SIZE: 1,2,4,8 MODEL: 1,2,3,4 |
| + |
| +#if SIZE == 1 |
| +#define S b |
| +#define UXT uxtb |
| +#define B 0x00000000 |
| +#elif SIZE == 2 |
| +#define S h |
| +#define UXT uxth |
| +#define B 0x40000000 |
| +#elif SIZE == 4 || SIZE == 8 || SIZE == 16 |
| +#define S |
| +#define UXT mov |
| +#if SIZE == 4 |
| +#define B 0x80000000 |
| +#elif SIZE == 8 |
| +#define B 0xc0000000 |
| +#endif |
| +#else |
| +#error |
| +#endif // SIZE |
| + |
| +#if MODEL == 1 |
| +#define SUFF _relax |
| +#define A |
| +#define L |
| +#define M 0x000000 |
| +#define N 0x000000 |
| +#elif MODEL == 2 |
| +#define SUFF _acq |
| +#define A a |
| +#define L |
| +#define M 0x400000 |
| +#define N 0x800000 |
| +#elif MODEL == 3 |
| +#define SUFF _rel |
| +#define A |
| +#define L l |
| +#define M 0x008000 |
| +#define N 0x400000 |
| +#elif MODEL == 4 |
| +#define SUFF _acq_rel |
| +#define A a |
| +#define L l |
| +#define M 0x408000 |
| +#define N 0xc00000 |
| +#else |
| +#error |
| +#endif // MODEL |
| + |
| +// Define register size. |
| +#define x(N) GLUE2(x, N) |
| +#define w(N) GLUE2(w, N) |
| +#if SIZE < 8 |
| +#define s(N) w(N) |
| +#else |
| +#define s(N) x(N) |
| +#endif |
| + |
| +#define NAME(BASE) GLUE4(__aarch64_, BASE, SIZE, SUFF) |
| +#define LDXR GLUE4(ld, A, xr, S) |
| +#define STXR GLUE4(st, L, xr, S) |
| + |
| +// Define temporary registers. |
| +#define tmp0 16 |
| +#define tmp1 17 |
| +#define tmp2 15 |
| + |
| +// Macro for branch to label if no LSE available |
| +.macro JUMP_IF_NOT_LSE label |
| +#if !defined(__APPLE__) |
| + adrp x(tmp0), __aarch64_have_lse_atomics |
| + ldrb w(tmp0), [x(tmp0), :lo12:__aarch64_have_lse_atomics] |
| +#else |
| + adrp x(tmp0), ___aarch64_have_lse_atomics@page |
| + ldrb w(tmp0), [x(tmp0), ___aarch64_have_lse_atomics@pageoff] |
| +#endif |
| + cbz w(tmp0), \label |
| +.endm |
| + |
| +#ifdef L_cas |
| +DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(cas)) |
| + JUMP_IF_NOT_LSE 8f |
| +#if SIZE < 16 |
| +#ifdef HAS_ASM_LSE |
| +#define CAS GLUE4(cas, A, L, S) s(0), s(1), [x2] |
| +#else |
| +#define CAS .inst 0x08a07c41 + B + M |
| +#endif |
| + CAS // s(0), s(1), [x2] |
| + ret |
| +8: |
| + UXT s(tmp0), s(0) |
| +0: |
| + LDXR s(0), [x2] |
| + cmp s(0), s(tmp0) |
| + bne 1f |
| + STXR w(tmp1), s(1), [x2] |
| + cbnz w(tmp1), 0b |
| +1: |
| + ret |
| +#else |
| +#define LDXP GLUE3(ld, A, xp) |
| +#define STXP GLUE3(st, L, xp) |
| +#ifdef HAS_ASM_LSE |
| +#define CASP GLUE3(casp, A, L) x0, x1, x2, x3, [x4] |
| +#else |
| +#define CASP .inst 0x48207c82 + M |
| +#endif |
| + |
| + CASP // x0, x1, x2, x3, [x4] |
| + ret |
| +8: |
| + mov x(tmp0), x0 |
| + mov x(tmp1), x1 |
| +0: |
| + LDXP x0, x1, [x4] |
| + cmp x0, x(tmp0) |
| + ccmp x1, x(tmp1), #0, eq |
| + bne 1f |
| + STXP w(tmp2), x2, x3, [x4] |
| + cbnz w(tmp2), 0b |
| +1: |
| + ret |
| +#endif |
| +END_COMPILERRT_OUTLINE_FUNCTION(NAME(cas)) |
| +#endif // L_cas |
| + |
| +#ifdef L_swp |
| +#ifdef HAS_ASM_LSE |
| +#define SWP GLUE4(swp, A, L, S) s(0), s(0), [x1] |
| +#else |
| +#define SWP .inst 0x38208020 + B + N |
| +#endif |
| +DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(swp)) |
| + JUMP_IF_NOT_LSE 8f |
| + SWP // s(0), s(0), [x1] |
| + ret |
| +8: |
| + mov s(tmp0), s(0) |
| +0: |
| + LDXR s(0), [x1] |
| + STXR w(tmp1), s(tmp0), [x1] |
| + cbnz w(tmp1), 0b |
| + ret |
| +END_COMPILERRT_OUTLINE_FUNCTION(NAME(swp)) |
| +#endif // L_swp |
| + |
| +#if defined(L_ldadd) || defined(L_ldclr) || \ |
| + defined(L_ldeor) || defined(L_ldset) |
| + |
| +#ifdef L_ldadd |
| +#define LDNM ldadd |
| +#define OP add |
| +#define OPN 0x0000 |
| +#elif defined(L_ldclr) |
| +#define LDNM ldclr |
| +#define OP bic |
| +#define OPN 0x1000 |
| +#elif defined(L_ldeor) |
| +#define LDNM ldeor |
| +#define OP eor |
| +#define OPN 0x2000 |
| +#elif defined(L_ldset) |
| +#define LDNM ldset |
| +#define OP orr |
| +#define OPN 0x3000 |
| +#else |
| +#error |
| +#endif |
| + |
| +#ifdef HAS_ASM_LSE |
| +#define LDOP GLUE4(LDNM, A, L, S) s(0), s(0), [x1] |
| +#else |
| +#define LDOP .inst 0x38200020 + OPN + B + N |
| +#endif |
| + |
| +DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(LDNM)) |
| + JUMP_IF_NOT_LSE 8f |
| + LDOP // s(0), s(0), [x1] |
| + ret |
| +8: |
| + mov s(tmp0), s(0) |
| +0: |
| + LDXR s(0), [x1] |
| + OP s(tmp1), s(0), s(tmp0) |
| + STXR w(tmp2), s(tmp1), [x1] |
| + cbnz w(tmp2), 0b |
| + ret |
| +END_COMPILERRT_OUTLINE_FUNCTION(NAME(LDNM)) |
| +#endif // L_ldadd L_ldclr L_ldeor L_ldset |
| + |
| +NO_EXEC_STACK_DIRECTIVE |
| + |
| +// GNU property note for BTI and PAC |
| +GNU_PROPERTY_BTI_PAC |
| + |
| +#endif // __aarch64__ |
| diff --git a/src/llvm-project/compiler-rt/lib/builtins/assembly.h b/src/llvm-project/compiler-rt/lib/builtins/assembly.h |
| index f437cb87f..f6ce6a9fc 100644 |
| --- a/src/llvm-project/compiler-rt/lib/builtins/assembly.h |
| +++ b/src/llvm-project/compiler-rt/lib/builtins/assembly.h |
| @@ -14,8 +14,8 @@ |
| #ifndef COMPILERRT_ASSEMBLY_H |
| #define COMPILERRT_ASSEMBLY_H |
| |
| -#if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__) |
| -#define SEPARATOR @ |
| +#if defined(__APPLE__) && defined(__aarch64__) |
| +#define SEPARATOR %% |
| #else |
| #define SEPARATOR ; |
| #endif |
| @@ -35,14 +35,14 @@ |
| #define HIDDEN(name) .hidden name |
| #define LOCAL_LABEL(name) .L_##name |
| #define FILE_LEVEL_DIRECTIVE |
| -#if defined(__arm__) |
| +#if defined(__arm__) || defined(__aarch64__) |
| #define SYMBOL_IS_FUNC(name) .type name,%function |
| #else |
| #define SYMBOL_IS_FUNC(name) .type name,@function |
| #endif |
| #define CONST_SECTION .section .rodata |
| |
| -#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ |
| +#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ |
| defined(__linux__) |
| #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits |
| #else |
| @@ -65,6 +65,66 @@ |
| |
| #endif |
| |
| +#if defined(__arm__) || defined(__aarch64__) |
| +#define FUNC_ALIGN \ |
| + .text SEPARATOR \ |
| + .balign 16 SEPARATOR |
| +#else |
| +#define FUNC_ALIGN |
| +#endif |
| + |
| +// BTI and PAC gnu property note |
| +#define NT_GNU_PROPERTY_TYPE_0 5 |
| +#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000 |
| +#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI 1 |
| +#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC 2 |
| + |
| +#if defined(__ARM_FEATURE_BTI_DEFAULT) |
| +#define BTI_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_BTI |
| +#else |
| +#define BTI_FLAG 0 |
| +#endif |
| + |
| +#if __ARM_FEATURE_PAC_DEFAULT & 3 |
| +#define PAC_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_PAC |
| +#else |
| +#define PAC_FLAG 0 |
| +#endif |
| + |
| +#define GNU_PROPERTY(type, value) \ |
| + .pushsection .note.gnu.property, "a" SEPARATOR \ |
| + .p2align 3 SEPARATOR \ |
| + .word 4 SEPARATOR \ |
| + .word 16 SEPARATOR \ |
| + .word NT_GNU_PROPERTY_TYPE_0 SEPARATOR \ |
| + .asciz "GNU" SEPARATOR \ |
| + .word type SEPARATOR \ |
| + .word 4 SEPARATOR \ |
| + .word value SEPARATOR \ |
| + .word 0 SEPARATOR \ |
| + .popsection |
| + |
| +#if BTI_FLAG != 0 |
| +#define BTI_C bti c |
| +#else |
| +#define BTI_C |
| +#endif |
| + |
| +#if (BTI_FLAG | PAC_FLAG) != 0 |
| +#define GNU_PROPERTY_BTI_PAC \ |
| + GNU_PROPERTY(GNU_PROPERTY_AARCH64_FEATURE_1_AND, BTI_FLAG | PAC_FLAG) |
| +#else |
| +#define GNU_PROPERTY_BTI_PAC |
| +#endif |
| + |
| +#if defined(__clang__) || defined(__GCC_HAVE_DWARF2_CFI_ASM) |
| +#define CFI_START .cfi_startproc |
| +#define CFI_END .cfi_endproc |
| +#else |
| +#define CFI_START |
| +#define CFI_END |
| +#endif |
| + |
| #if defined(__arm__) |
| |
| // Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros: |
| @@ -131,8 +191,14 @@ |
| #define DEFINE_CODE_STATE |
| #endif |
| |
| -#define GLUE2(a, b) a##b |
| -#define GLUE(a, b) GLUE2(a, b) |
| +#define GLUE2_(a, b) a##b |
| +#define GLUE(a, b) GLUE2_(a, b) |
| +#define GLUE2(a, b) GLUE2_(a, b) |
| +#define GLUE3_(a, b, c) a##b##c |
| +#define GLUE3(a, b, c) GLUE3_(a, b, c) |
| +#define GLUE4_(a, b, c, d) a##b##c##d |
| +#define GLUE4(a, b, c, d) GLUE4_(a, b, c, d) |
| + |
| #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) |
| |
| #ifdef VISIBILITY_HIDDEN |
| @@ -177,6 +243,16 @@ |
| DECLARE_FUNC_ENCODING \ |
| name: |
| |
| +#define DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(name) \ |
| + DEFINE_CODE_STATE \ |
| + FUNC_ALIGN \ |
| + .globl name SEPARATOR \ |
| + SYMBOL_IS_FUNC(name) SEPARATOR \ |
| + DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR \ |
| + CFI_START SEPARATOR \ |
| + DECLARE_FUNC_ENCODING \ |
| + name: SEPARATOR BTI_C |
| + |
| #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target) \ |
| .globl SYMBOL_NAME(name) SEPARATOR \ |
| SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ |
| @@ -193,8 +269,13 @@ |
| #ifdef __ELF__ |
| #define END_COMPILERRT_FUNCTION(name) \ |
| .size SYMBOL_NAME(name), . - SYMBOL_NAME(name) |
| +#define END_COMPILERRT_OUTLINE_FUNCTION(name) \ |
| + CFI_END SEPARATOR \ |
| + .size SYMBOL_NAME(name), . - SYMBOL_NAME(name) |
| #else |
| #define END_COMPILERRT_FUNCTION(name) |
| +#define END_COMPILERRT_OUTLINE_FUNCTION(name) \ |
| + CFI_END |
| #endif |
| |
| #endif // COMPILERRT_ASSEMBLY_H |
| diff --git a/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c b/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c |
| index 468bcc84c..1f72d800f 100644 |
| --- a/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c |
| +++ b/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c |
| @@ -12,6 +12,16 @@ |
| // |
| //===----------------------------------------------------------------------===// |
| |
| +#if defined(HAVE_INIT_PRIORITY) |
| +#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101)) |
| +#elif __has_attribute(__constructor__) |
| +#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__)) |
| +#else |
| +// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that |
| +// this runs during initialization. |
| +#define CONSTRUCTOR_ATTRIBUTE |
| +#endif |
| + |
| #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) || \ |
| defined(_M_X64)) && \ |
| (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER)) |
| @@ -656,16 +666,6 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf, |
| #undef setFeature |
| } |
| |
| -#if defined(HAVE_INIT_PRIORITY) |
| -#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101)) |
| -#elif __has_attribute(__constructor__) |
| -#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__)) |
| -#else |
| -// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that |
| -// this runs during initialization. |
| -#define CONSTRUCTOR_ATTRIBUTE |
| -#endif |
| - |
| #ifndef _WIN32 |
| __attribute__((visibility("hidden"))) |
| #endif |
| @@ -741,4 +741,24 @@ int CONSTRUCTOR_ATTRIBUTE __cpu_indicator_init(void) { |
| return 0; |
| } |
| |
| +#elif defined(__aarch64__) |
| +// LSE support detection for out-of-line atomics |
| +// using HWCAP and Auxiliary vector |
| +_Bool __aarch64_have_lse_atomics |
| + __attribute__((visibility("hidden"), nocommon)); |
| +#if defined(__has_include) |
| +#if __has_include(<sys/auxv.h>) |
| +#include <sys/auxv.h> |
| +#ifndef AT_HWCAP |
| +#define AT_HWCAP 16 |
| +#endif |
| +#ifndef HWCAP_ATOMICS |
| +#define HWCAP_ATOMICS (1 << 8) |
| +#endif |
| +static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) { |
| + unsigned long hwcap = getauxval(AT_HWCAP); |
| + __aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0; |
| +} |
| +#endif // defined(__has_include) |
| +#endif // __has_include(<sys/auxv.h>) |
| #endif |
| diff --git a/vendor/compiler_builtins/.cargo-checksum.json b/vendor/compiler_builtins/.cargo-checksum.json |
| index 4322d5560..455b74c98 100644 |
| --- a/vendor/compiler_builtins/.cargo-checksum.json |
| +++ b/vendor/compiler_builtins/.cargo-checksum.json |
| @@ -1 +1 @@ |
| 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| \ No newline at end of file |
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|
| \ No newline at end of file |
| diff --git a/vendor/compiler_builtins/build.rs b/vendor/compiler_builtins/build.rs |
| index f948edba9..c57802569 100644 |
| --- a/vendor/compiler_builtins/build.rs |
| +++ b/vendor/compiler_builtins/build.rs |
| @@ -81,7 +81,7 @@ mod c { |
| |
| use std::collections::BTreeMap; |
| use std::env; |
| - use std::path::PathBuf; |
| + use std::path::{Path, PathBuf}; |
| |
| struct Sources { |
| // SYMBOL -> PATH TO SOURCE |
| @@ -487,7 +487,20 @@ mod c { |
| // use of that macro in lib/builtins/int_util.h in compiler-rt. |
| cfg.flag_if_supported(&format!("-ffile-prefix-map={}=.", root.display())); |
| |
| + // Include out-of-line atomics for aarch64, which are all generated by supplying different |
| + // sets of flags to the same source file. |
| let src_dir = root.join("lib/builtins"); |
| + if target_arch == "aarch64" { |
| + let atomics_libs = build_aarch64_out_of_line_atomics_libraries(&src_dir, cfg); |
| + if !atomics_libs.is_empty() { |
| + for library in atomics_libs { |
| + cfg.object(library); |
| + } |
| + // Some run-time CPU feature detection is necessary, as well. |
| + sources.extend(&[("__aarch64_have_lse_atomics", "cpu_model.c")]); |
| + } |
| + } |
| + |
| for (sym, src) in sources.map.iter() { |
| let src = src_dir.join(src); |
| cfg.file(&src); |
| @@ -497,4 +510,60 @@ mod c { |
| |
| cfg.compile("libcompiler-rt.a"); |
| } |
| + |
| + fn build_aarch64_out_of_line_atomics_libraries( |
| + builtins_dir: &Path, |
| + cfg: &cc::Build, |
| + ) -> Vec<PathBuf> { |
| + // NOTE: because we're recompiling the same source file in N different ways, building |
| + // serially is necessary. If we want to lift this restriction, we can either: |
| + // - create symlinks to lse.S and build those_(though we'd still need to pass special |
| + // #define-like flags to each of these), or |
| + // - synthesizing tiny .S files in out/ with the proper #defines, which ultimately #include |
| + // lse.S. |
| + // That said, it's unclear how useful this added complexity will be, so just do the simple |
| + // thing for now. |
| + let outlined_atomics_file = builtins_dir.join("aarch64/lse.S"); |
| + |
| + // A stable release hasn't been made with lse.S yet. Until we pick that up, do nothing. |
| + if !outlined_atomics_file.exists() { |
| + return vec![]; |
| + } |
| + |
| + println!("cargo:rerun-if-changed={}", outlined_atomics_file.display()); |
| + let out_dir: PathBuf = env::var("OUT_DIR").unwrap().into(); |
| + |
| + // Ideally, this would be a Vec of object files, but cc doesn't make it *entirely* |
| + // trivial to build an individual object. |
| + let mut atomics_libraries = Vec::new(); |
| + for instruction_type in &["cas", "cwp", "ldadd", "ldclr", "ldeor", "ldset"] { |
| + for size in &[1, 2, 4, 8, 16] { |
| + if *size == 16 && *instruction_type != "cas" { |
| + continue; |
| + } |
| + |
| + for (model_number, model_name) in |
| + &[(1, "relax"), (2, "acq"), (3, "rel"), (4, "acq_rel")] |
| + { |
| + let library_name = format!( |
| + "liboutline_atomic_helper_{}_{}_{}.a", |
| + instruction_type, size, model_name |
| + ); |
| + let sym = format!("__aarch64_{}{}_{}", instruction_type, size, model_name); |
| + let mut cfg = cfg.clone(); |
| + |
| + cfg.include(&builtins_dir) |
| + .define(&format!("L_{}", instruction_type), None) |
| + .define("SIZE", size.to_string().as_str()) |
| + .define("MODEL", model_number.to_string().as_str()) |
| + .file(&outlined_atomics_file); |
| + cfg.compile(&library_name); |
| + |
| + atomics_libraries.push(out_dir.join(library_name)); |
| + println!("cargo:rustc-cfg={}=\"optimized-c\"", sym); |
| + } |
| + } |
| + } |
| + atomics_libraries |
| + } |
| } |
