c5757f808b
build fails on musl libc (alpine linux) with this error:
../util/cpuinfo-riscv.c: In function 'cpuinfo_init':
../util/cpuinfo-riscv.c:63:21: error: '__NR_riscv_hwprobe' undeclared (first use in this function); did you mean 'riscv_hwprobe'?
63 | if (syscall(__NR_riscv_hwprobe, &pair, 1, 0, NULL, 0) == 0
| ^~~~~~~~~~~~~~~~~~
| riscv_hwprobe
../util/cpuinfo-riscv.c:63:21: note: each undeclared identifier is reported only once for each function it appears in
ninja: subcommand failed
add '#include "asm/unistd.h"' to util/cpuinfo-riscv.c fixes build
Signed-off-by: Milan P. Stanić <mps@arvanta.net>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20240905150702.2484-1-mps@arvanta.net>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
* Host specific cpu identification for RISC-V.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "host/cpuinfo.h"
|
|
|
|
#ifdef CONFIG_ASM_HWPROBE_H
|
|
#include <asm/hwprobe.h>
|
|
#include <sys/syscall.h>
|
|
#include <asm/unistd.h>
|
|
#endif
|
|
|
|
unsigned cpuinfo;
|
|
static volatile sig_atomic_t got_sigill;
|
|
|
|
static void sigill_handler(int signo, siginfo_t *si, void *data)
|
|
{
|
|
/* Skip the faulty instruction */
|
|
ucontext_t *uc = (ucontext_t *)data;
|
|
|
|
#ifdef __linux__
|
|
uc->uc_mcontext.__gregs[REG_PC] += 4;
|
|
#elif defined(__OpenBSD__)
|
|
uc->sc_sepc += 4;
|
|
#else
|
|
# error Unsupported OS
|
|
#endif
|
|
|
|
got_sigill = 1;
|
|
}
|
|
|
|
/* Called both as constructor and (possibly) via other constructors. */
|
|
unsigned __attribute__((constructor)) cpuinfo_init(void)
|
|
{
|
|
unsigned left = CPUINFO_ZBA | CPUINFO_ZBB | CPUINFO_ZICOND;
|
|
unsigned info = cpuinfo;
|
|
|
|
if (info) {
|
|
return info;
|
|
}
|
|
|
|
/* Test for compile-time settings. */
|
|
#if defined(__riscv_arch_test) && defined(__riscv_zba)
|
|
info |= CPUINFO_ZBA;
|
|
#endif
|
|
#if defined(__riscv_arch_test) && defined(__riscv_zbb)
|
|
info |= CPUINFO_ZBB;
|
|
#endif
|
|
#if defined(__riscv_arch_test) && defined(__riscv_zicond)
|
|
info |= CPUINFO_ZICOND;
|
|
#endif
|
|
left &= ~info;
|
|
|
|
#ifdef CONFIG_ASM_HWPROBE_H
|
|
if (left) {
|
|
/*
|
|
* TODO: glibc 2.40 will introduce <sys/hwprobe.h>, which
|
|
* provides __riscv_hwprobe and __riscv_hwprobe_one,
|
|
* which is a slightly cleaner interface.
|
|
*/
|
|
struct riscv_hwprobe pair = { .key = RISCV_HWPROBE_KEY_IMA_EXT_0 };
|
|
if (syscall(__NR_riscv_hwprobe, &pair, 1, 0, NULL, 0) == 0
|
|
&& pair.key >= 0) {
|
|
info |= pair.value & RISCV_HWPROBE_EXT_ZBA ? CPUINFO_ZBA : 0;
|
|
info |= pair.value & RISCV_HWPROBE_EXT_ZBB ? CPUINFO_ZBB : 0;
|
|
left &= ~(CPUINFO_ZBA | CPUINFO_ZBB);
|
|
#ifdef RISCV_HWPROBE_EXT_ZICOND
|
|
info |= pair.value & RISCV_HWPROBE_EXT_ZICOND ? CPUINFO_ZICOND : 0;
|
|
left &= ~CPUINFO_ZICOND;
|
|
#endif
|
|
}
|
|
}
|
|
#endif /* CONFIG_ASM_HWPROBE_H */
|
|
|
|
if (left) {
|
|
struct sigaction sa_old, sa_new;
|
|
|
|
memset(&sa_new, 0, sizeof(sa_new));
|
|
sa_new.sa_flags = SA_SIGINFO;
|
|
sa_new.sa_sigaction = sigill_handler;
|
|
sigaction(SIGILL, &sa_new, &sa_old);
|
|
|
|
if (left & CPUINFO_ZBA) {
|
|
/* Probe for Zba: add.uw zero,zero,zero. */
|
|
got_sigill = 0;
|
|
asm volatile(".insn r 0x3b, 0, 0x04, zero, zero, zero"
|
|
: : : "memory");
|
|
info |= got_sigill ? 0 : CPUINFO_ZBA;
|
|
left &= ~CPUINFO_ZBA;
|
|
}
|
|
|
|
if (left & CPUINFO_ZBB) {
|
|
/* Probe for Zbb: andn zero,zero,zero. */
|
|
got_sigill = 0;
|
|
asm volatile(".insn r 0x33, 7, 0x20, zero, zero, zero"
|
|
: : : "memory");
|
|
info |= got_sigill ? 0 : CPUINFO_ZBB;
|
|
left &= ~CPUINFO_ZBB;
|
|
}
|
|
|
|
if (left & CPUINFO_ZICOND) {
|
|
/* Probe for Zicond: czero.eqz zero,zero,zero. */
|
|
got_sigill = 0;
|
|
asm volatile(".insn r 0x33, 5, 0x07, zero, zero, zero"
|
|
: : : "memory");
|
|
info |= got_sigill ? 0 : CPUINFO_ZICOND;
|
|
left &= ~CPUINFO_ZICOND;
|
|
}
|
|
|
|
sigaction(SIGILL, &sa_old, NULL);
|
|
assert(left == 0);
|
|
}
|
|
|
|
info |= CPUINFO_ALWAYS;
|
|
cpuinfo = info;
|
|
return info;
|
|
}
|