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| author | Andrey Bokhanko <andreybokhanko@gmail.com> | 2024-09-03 08:19:18 +0300 |
|---|---|---|
| committer | Cherry Mui <cherryyz@google.com> | 2024-10-22 16:16:32 +0000 |
| commit | 4e7025860129b33f704634583d20539af19c344b (patch) | |
| tree | 8beeb78119bc864d287a5a88638cb4b7e99544fb /src/runtime | |
| parent | 38f85967873b1cd48c20681c5dff0e9f3de18516 (diff) | |
| download | go-4e7025860129b33f704634583d20539af19c344b.tar.xz | |
runtime: Check LSE support on ARM64 at runtime init
Check presence of LSE support on ARM64 chip if we targeted it at compile time.
Related to #69124
Update #60905
Change-Id: I6fe244decbb4982548982e1f88376847721a33c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/610195
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Shu-Chun Weng <scw@google.com>
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/asm_arm64.s | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/runtime/asm_arm64.s b/src/runtime/asm_arm64.s index 64a1880589..88bfd3ce5c 100644 --- a/src/runtime/asm_arm64.s +++ b/src/runtime/asm_arm64.s @@ -8,6 +8,11 @@ #include "funcdata.h" #include "textflag.h" +#ifdef GOARM64_LSE +DATA no_lse_msg<>+0x00(SB)/64, $"This program can only run on ARM64 processors with LSE support.\n" +GLOBL no_lse_msg<>(SB), RODATA, $64 +#endif + TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0 // SP = stack; R0 = argc; R1 = argv @@ -77,6 +82,21 @@ nocgo: BL runtime·wintls(SB) #endif + // Check that CPU we use for execution supports instructions targeted during compile-time. +#ifdef GOARM64_LSE +#ifndef GOOS_openbsd + // Read the ID_AA64ISAR0_EL1 register + MRS ID_AA64ISAR0_EL1, R0 + + // Extract the LSE field (bits [23:20]) + LSR $20, R0, R0 + AND $0xf, R0, R0 + + // LSE support is indicated by a non-zero value + CBZ R0, no_lse +#endif +#endif + MOVW 8(RSP), R0 // copy argc MOVW R0, -8(RSP) MOVD 16(RSP), R0 // copy argv @@ -95,6 +115,23 @@ nocgo: // start this M BL runtime·mstart(SB) + RET + +#ifdef GOARM64_LSE +#ifndef GOOS_openbsd +no_lse: + MOVD $1, R0 // stderr + MOVD R0, 8(RSP) + MOVD $no_lse_msg<>(SB), R1 // message address + MOVD R1, 16(RSP) + MOVD $64, R2 // message length + MOVD R2, 24(RSP) + CALL runtime·write(SB) + CALL runtime·exit(SB) + CALL runtime·abort(SB) + RET +#endif +#endif // Prevent dead-code elimination of debugCallV2 and debugPinnerV1, which are // intended to be called by debuggers. |