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runtime: check LSE support on ARM64 at runtime init

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Check presence of LSE support on ARM64 chip if we targeted it at compile
time.

Related to #69124
Updates #60905
Fixes #71411

Change-Id: I65e899a28ff64a390182572c0c353aa5931fc85d
Reviewed-on: https://go-review.googlesource.com/c/go/+/645795
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Andrey Bokhanko 2025-01-31 16:59:02 +03:00 • committed by Gopher Robot
parent d524e1eccd
commit 81c66e71d4
1 changed files with 50 additions and 0 deletions
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50
src/runtime/asm_arm64.s
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@ -8,6 +8,28 @@
#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
// We know for sure that Linux and FreeBSD allow to read instruction set
// attribute registers (while some others OSes, like OpenBSD and Darwin,
// are not). Let's be conservative and allow code reading such registers
// only when we sure this won't lead to sigill.
#ifdef GOOS_linux
#define ISA_REGS_READABLE
#endif
#ifdef GOOS_freebsd
#define ISA_REGS_READABLE
#endif
#ifdef GOARM64_LSE
#ifdef ISA_REGS_READABLE
#define CHECK_GOARM64_LSE
#endif
#endif
TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0
// SP = stack; R0 = argc; R1 = argv
@ -77,6 +99,19 @@ nocgo:
BL runtime·wintls(SB)
#endif
// Check that CPU we use for execution supports instructions targeted during compile-time.
#ifdef CHECK_GOARM64_LSE
// 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
MOVW 8(RSP), R0 // copy argc
MOVW R0, -8(RSP)
MOVD 16(RSP), R0 // copy argv
@ -95,6 +130,21 @@ nocgo:
// start this M
BL runtime·mstart(SB)
UNDEF
#ifdef CHECK_GOARM64_LSE
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
// Prevent dead-code elimination of debugCallV2 and debugPinnerV1, which are
// intended to be called by debuggers.