From: Afonso Bordado <afonsobordado@gmail.com>
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 sting.
Signed-off-by: Afonso Bordado <afonsobordado@gmail.com>
---
linux-user/syscall.c | 32 +++++++++++++++++++++++++++++--
tests/tcg/riscv64/Makefile.target | 1 +
tests/tcg/riscv64/cpuinfo.c | 30 +++++++++++++++++++++++++++++
3 files changed, 61 insertions(+), 2 deletions(-)
create mode 100644 tests/tcg/riscv64/cpuinfo.c
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index a6c426d73c..eda2bc5df0 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8183,7 +8183,8 @@ void target_exception_dump(CPUArchState *env, const char
*fmt, int code)
}
#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)
{
return strcmp(filename, entry) == 0;
@@ -8261,6 +8262,33 @@ static int open_cpuinfo(CPUArchState *cpu_env, int fd)
}
#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);
+ char *isa_string = riscv_isa_string(cpu);
+ bool is_32_bit = riscv_cpu_xlen(&cpu->env) == 32;
+ const char *mmu;
+
+ if (cpu->cfg.mmu) {
+ mmu = (is_32_bit) ? "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");
+ }
+ return 0;
+}
+#endif
+
#if defined(TARGET_M68K)
static int open_hardware(CPUArchState *cpu_env, int fd)
{
@@ -8285,7 +8313,7 @@ static int do_openat(CPUArchState *cpu_env, int dirfd,
const char *pathname, int
#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
{ "/proc/net/route", open_net_route, is_proc },
#endif
-#if defined(TARGET_SPARC) || defined(TARGET_HPPA)
+#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || defined(TARGET_RISCV)
{ "/proc/cpuinfo", open_cpuinfo, is_proc },
#endif
#if defined(TARGET_M68K)
diff --git a/tests/tcg/riscv64/Makefile.target
b/tests/tcg/riscv64/Makefile.target
index cc3ed65ffd..df93a2ce1f 100644
--- a/tests/tcg/riscv64/Makefile.target
+++ b/tests/tcg/riscv64/Makefile.target
@@ -4,6 +4,7 @@
VPATH += $(SRC_PATH)/tests/tcg/riscv64
TESTS += test-div
TESTS += noexec
+TESTS += cpuinfo
# Disable compressed instructions for test-noc
TESTS += test-noc
diff --git a/tests/tcg/riscv64/cpuinfo.c b/tests/tcg/riscv64/cpuinfo.c
new file mode 100644
index 0000000000..296abd0a8c
--- /dev/null
+++ b/tests/tcg/riscv64/cpuinfo.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define BUFFER_SIZE 1024
+
+int main(void)
+{
+ char buffer[BUFFER_SIZE];
+ FILE *fp = fopen("/proc/cpuinfo", "r");
+ assert(fp != NULL);
+
+ while (fgets(buffer, BUFFER_SIZE, fp) != NULL) {
+ if (strstr(buffer, "processor") != NULL) {
+ assert(strstr(buffer, "processor\t: ") == buffer);
+ } else if (strstr(buffer, "hart") != NULL) {
+ assert(strstr(buffer, "hart\t\t: ") == buffer);
+ } else if (strstr(buffer, "isa") != NULL) {
+ assert(strcmp(buffer, "isa\t\t: rv64imafdc_zicsr_zifencei\n") ==
0);
+ } else if (strstr(buffer, "mmu") != NULL) {
+ assert(strcmp(buffer, "mmu\t\t: sv48\n") == 0);
+ } else if (strstr(buffer, "uarch") != NULL) {
+ assert(strcmp(buffer, "uarch\t\t: qemu\n") == 0);
+ }
+ }
+
+ fclose(fp);
+ return 0;
+}