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linux-user: Emulate /proc/cpuinfo output for riscv

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RISC-V does not expose all extensions via hwcaps, thus some userspace
applications may want to query these via /proc/cpuinfo.

Currently when querying this file the host's file is shown instead
which is slightly confusing. Emulate a basic /proc/cpuinfo file
with mmu info and an ISA string.

Signed-off-by: Afonso Bordado <afonsobordado@gmail.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Message-Id: <167873059442.9885.15152085316575248452-0@git.sr.ht>
[lv: removed the test that fails in CI for unknown reason]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Afonso Bordado 2023-03-05 14:34:37 +00:00 • committed by Laurent Vivier
parent 7c18f2d663
commit 8ddc171b7b
1 changed files with 32 additions and 2 deletions
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34
linux-user/syscall.c
View file

@ -8231,7 +8231,8 @@ void target_exception_dump(CPUArchState *env, const char *fmt, int code)
} }
#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \ #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
defined(TARGET_RISCV)
static int is_proc(const char *filename, const char *entry) static int is_proc(const char *filename, const char *entry)
{ {
return strcmp(filename, entry) == 0; return strcmp(filename, entry) == 0;
@ -8309,6 +8310,35 @@ static int open_cpuinfo(CPUArchState *cpu_env, int fd)
} }
#endif #endif
#if defined(TARGET_RISCV)
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
int i;
int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
RISCVCPU *cpu = env_archcpu(cpu_env);
const RISCVCPUConfig *cfg = riscv_cpu_cfg((CPURISCVState *) cpu_env);
char *isa_string = riscv_isa_string(cpu);
const char *mmu;
if (cfg->mmu) {
mmu = (cpu_env->xl == MXL_RV32) ? "sv32" : "sv48";
} else {
mmu = "none";
}
for (i = 0; i < num_cpus; i++) {
dprintf(fd, "processor\t: %d\n", i);
dprintf(fd, "hart\t\t: %d\n", i);
dprintf(fd, "isa\t\t: %s\n", isa_string);
dprintf(fd, "mmu\t\t: %s\n", mmu);
dprintf(fd, "uarch\t\t: qemu\n\n");
}
g_free(isa_string);
return 0;
}
#endif
#if defined(TARGET_M68K) #if defined(TARGET_M68K)
static int open_hardware(CPUArchState *cpu_env, int fd) static int open_hardware(CPUArchState *cpu_env, int fd)
{ {
@ -8333,7 +8363,7 @@ static int do_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, int
#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
{ "/proc/net/route", open_net_route, is_proc }, { "/proc/net/route", open_net_route, is_proc },
#endif #endif
#if defined(TARGET_SPARC) || defined(TARGET_HPPA) #if defined(TARGET_SPARC) || defined(TARGET_HPPA) || defined(TARGET_RISCV)
{ "/proc/cpuinfo", open_cpuinfo, is_proc }, { "/proc/cpuinfo", open_cpuinfo, is_proc },
#endif #endif
#if defined(TARGET_M68K) #if defined(TARGET_M68K)