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linux-user: Rewrite and improve /proc/pid/maps

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linux-user: Fix shmdt and improve shm region tracking
 linux-user: Remove ELF_START_MMAP and image_info.start_mmap
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Merge tag 'pull-lu-20230901' of https://gitlab.com/rth7680/qemu into staging

linux-user: Rewrite and improve /proc/pid/maps
linux-user: Fix shmdt and improve shm region tracking
linux-user: Remove ELF_START_MMAP and image_info.start_mmap

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* tag 'pull-lu-20230901' of https://gitlab.com/rth7680/qemu:
  linux-user: Track shm regions with an interval tree
  linux-user: Fix shmdt
  linux-user: Use WITH_MMAP_LOCK_GUARD in target_{shmat,shmdt}
  linux-user: Move shmat and shmdt implementations to mmap.c
  linux-user: Remove ELF_START_MMAP and image_info.start_mmap
  linux-user: Emulate the Anonymous: keyword in /proc/self/smaps
  linux-user: Show heap address in /proc/pid/maps
  linux-user: Adjust brk for load_bias
  linux-user: Use walk_memory_regions for open_self_maps
  util/selfmap: Use dev_t and ino_t in MapInfo
  linux-user: Emulate /proc/cpuinfo for Alpha
  linux-user: Emulate /proc/cpuinfo on aarch64 and arm
  linux-user: Split out cpu/target_proc.h

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-09-06 11:15:10 -04:00
commit bde438c3ec
29 changed files with 828 additions and 437 deletions
Download patch file Download diff file Expand all files Collapse all files

514
linux-user/syscall.c
View file

@ -3725,14 +3725,6 @@ static abi_long do_socketcall(int num, abi_ulong vptr)
}
#endif
#define N_SHM_REGIONS 32
static struct shm_region {
abi_ulong start;
abi_ulong size;
bool in_use;
} shm_regions[N_SHM_REGIONS];
#ifndef TARGET_SEMID64_DS
/* asm-generic version of this struct */
struct target_semid64_ds
@ -4482,133 +4474,6 @@ static inline abi_long do_shmctl(int shmid, int cmd, abi_long buf)
return ret;
}
#ifndef TARGET_FORCE_SHMLBA
/* For most architectures, SHMLBA is the same as the page size;
* some architectures have larger values, in which case they should
* define TARGET_FORCE_SHMLBA and provide a target_shmlba() function.
* This corresponds to the kernel arch code defining __ARCH_FORCE_SHMLBA
* and defining its own value for SHMLBA.
*
* The kernel also permits SHMLBA to be set by the architecture to a
* value larger than the page size without setting __ARCH_FORCE_SHMLBA;
* this means that addresses are rounded to the large size if
* SHM_RND is set but addresses not aligned to that size are not rejected
* as long as they are at least page-aligned. Since the only architecture
* which uses this is ia64 this code doesn't provide for that oddity.
*/
static inline abi_ulong target_shmlba(CPUArchState *cpu_env)
{
return TARGET_PAGE_SIZE;
}
#endif
static abi_ulong do_shmat(CPUArchState *cpu_env, int shmid,
abi_ulong shmaddr, int shmflg)
{
CPUState *cpu = env_cpu(cpu_env);
abi_ulong raddr;
void *host_raddr;
struct shmid_ds shm_info;
int i, ret;
abi_ulong shmlba;
/* shmat pointers are always untagged */
/* find out the length of the shared memory segment */
ret = get_errno(shmctl(shmid, IPC_STAT, &shm_info));
if (is_error(ret)) {
/* can't get length, bail out */
return ret;
}
shmlba = target_shmlba(cpu_env);
if (shmaddr & (shmlba - 1)) {
if (shmflg & SHM_RND) {
shmaddr &= ~(shmlba - 1);
} else {
return -TARGET_EINVAL;
}
}
if (!guest_range_valid_untagged(shmaddr, shm_info.shm_segsz)) {
return -TARGET_EINVAL;
}
mmap_lock();
/*
* We're mapping shared memory, so ensure we generate code for parallel
* execution and flush old translations. This will work up to the level
* supported by the host -- anything that requires EXCP_ATOMIC will not
* be atomic with respect to an external process.
*/
if (!(cpu->tcg_cflags & CF_PARALLEL)) {
cpu->tcg_cflags |= CF_PARALLEL;
tb_flush(cpu);
}
if (shmaddr)
host_raddr = shmat(shmid, (void *)g2h_untagged(shmaddr), shmflg);
else {
abi_ulong mmap_start;
/* In order to use the host shmat, we need to honor host SHMLBA. */
mmap_start = mmap_find_vma(0, shm_info.shm_segsz, MAX(SHMLBA, shmlba));
if (mmap_start == -1) {
errno = ENOMEM;
host_raddr = (void *)-1;
} else
host_raddr = shmat(shmid, g2h_untagged(mmap_start),
shmflg | SHM_REMAP);
}
if (host_raddr == (void *)-1) {
mmap_unlock();
return get_errno((intptr_t)host_raddr);
}
raddr = h2g((uintptr_t)host_raddr);
page_set_flags(raddr, raddr + shm_info.shm_segsz - 1,
PAGE_VALID | PAGE_RESET | PAGE_READ |
(shmflg & SHM_RDONLY ? 0 : PAGE_WRITE));
for (i = 0; i < N_SHM_REGIONS; i++) {
if (!shm_regions[i].in_use) {
shm_regions[i].in_use = true;
shm_regions[i].start = raddr;
shm_regions[i].size = shm_info.shm_segsz;
break;
}
}
mmap_unlock();
return raddr;
}
static inline abi_long do_shmdt(abi_ulong shmaddr)
{
int i;
abi_long rv;
/* shmdt pointers are always untagged */
mmap_lock();
for (i = 0; i < N_SHM_REGIONS; ++i) {
if (shm_regions[i].in_use && shm_regions[i].start == shmaddr) {
shm_regions[i].in_use = false;
page_set_flags(shmaddr, shmaddr + shm_regions[i].size - 1, 0);
break;
}
}
rv = get_errno(shmdt(g2h_untagged(shmaddr)));
mmap_unlock();
return rv;
}
#ifdef TARGET_NR_ipc
/* ??? This only works with linear mappings. */
/* do_ipc() must return target values and target errnos. */
@ -4695,7 +4560,7 @@ static abi_long do_ipc(CPUArchState *cpu_env,
default:
{
abi_ulong raddr;
raddr = do_shmat(cpu_env, first, ptr, second);
raddr = target_shmat(cpu_env, first, ptr, second);
if (is_error(raddr))
return get_errno(raddr);
if (put_user_ual(raddr, third))
@ -4708,7 +4573,7 @@ static abi_long do_ipc(CPUArchState *cpu_env,
}
break;
case IPCOP_shmdt:
ret = do_shmdt(ptr);
ret = target_shmdt(ptr);
break;
case IPCOP_shmget:
@ -8095,12 +7960,68 @@ static int open_self_cmdline(CPUArchState *cpu_env, int fd)
return 0;
}
static void show_smaps(int fd, unsigned long size)
{
unsigned long page_size_kb = TARGET_PAGE_SIZE >> 10;
unsigned long size_kb = size >> 10;
struct open_self_maps_data {
TaskState *ts;
IntervalTreeRoot *host_maps;
int fd;
bool smaps;
};
dprintf(fd, "Size: %lu kB\n"
/*
* Subroutine to output one line of /proc/self/maps,
* or one region of /proc/self/smaps.
*/
#ifdef TARGET_HPPA
# define test_stack(S, E, L) (E == L)
#else
# define test_stack(S, E, L) (S == L)
#endif
static void open_self_maps_4(const struct open_self_maps_data *d,
const MapInfo *mi, abi_ptr start,
abi_ptr end, unsigned flags)
{
const struct image_info *info = d->ts->info;
const char *path = mi->path;
uint64_t offset;
int fd = d->fd;
int count;
if (test_stack(start, end, info->stack_limit)) {
path = "[stack]";
} else if (start == info->brk) {
path = "[heap]";
}
/* Except null device (MAP_ANON), adjust offset for this fragment. */
offset = mi->offset;
if (mi->dev) {
uintptr_t hstart = (uintptr_t)g2h_untagged(start);
offset += hstart - mi->itree.start;
}
count = dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr
" %c%c%c%c %08" PRIx64 " %02x:%02x %"PRId64,
start, end,
(flags & PAGE_READ) ? 'r' : '-',
(flags & PAGE_WRITE_ORG) ? 'w' : '-',
(flags & PAGE_EXEC) ? 'x' : '-',
mi->is_priv ? 'p' : 's',
offset, major(mi->dev), minor(mi->dev),
(uint64_t)mi->inode);
if (path) {
dprintf(fd, "%*s%s\n", 73 - count, "", path);
} else {
dprintf(fd, "\n");
}
if (d->smaps) {
unsigned long size = end - start;
unsigned long page_size_kb = TARGET_PAGE_SIZE >> 10;
unsigned long size_kb = size >> 10;
dprintf(fd, "Size: %lu kB\n"
"KernelPageSize: %lu kB\n"
"MMUPageSize: %lu kB\n"
"Rss: 0 kB\n"
@ -8111,7 +8032,7 @@ static void show_smaps(int fd, unsigned long size)
"Private_Clean: 0 kB\n"
"Private_Dirty: 0 kB\n"
"Referenced: 0 kB\n"
"Anonymous: 0 kB\n"
"Anonymous: %lu kB\n"
"LazyFree: 0 kB\n"
"AnonHugePages: 0 kB\n"
"ShmemPmdMapped: 0 kB\n"
@ -8121,89 +8042,76 @@ static void show_smaps(int fd, unsigned long size)
"Swap: 0 kB\n"
"SwapPss: 0 kB\n"
"Locked: 0 kB\n"
"THPeligible: 0\n", size_kb, page_size_kb, page_size_kb);
"THPeligible: 0\n"
"VmFlags:%s%s%s%s%s%s%s%s\n",
size_kb, page_size_kb, page_size_kb,
(flags & PAGE_ANON ? size_kb : 0),
(flags & PAGE_READ) ? " rd" : "",
(flags & PAGE_WRITE_ORG) ? " wr" : "",
(flags & PAGE_EXEC) ? " ex" : "",
mi->is_priv ? "" : " sh",
(flags & PAGE_READ) ? " mr" : "",
(flags & PAGE_WRITE_ORG) ? " mw" : "",
(flags & PAGE_EXEC) ? " me" : "",
mi->is_priv ? "" : " ms");
}
}
static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps)
/*
* Callback for walk_memory_regions, when read_self_maps() fails.
* Proceed without the benefit of host /proc/self/maps cross-check.
*/
static int open_self_maps_3(void *opaque, target_ulong guest_start,
target_ulong guest_end, unsigned long flags)
{
CPUState *cpu = env_cpu(cpu_env);
TaskState *ts = cpu->opaque;
IntervalTreeRoot *map_info = read_self_maps();
IntervalTreeNode *s;
int count;
static const MapInfo mi = { .is_priv = true };
for (s = interval_tree_iter_first(map_info, 0, -1); s;
s = interval_tree_iter_next(s, 0, -1)) {
MapInfo *e = container_of(s, MapInfo, itree);
open_self_maps_4(opaque, &mi, guest_start, guest_end, flags);
return 0;
}
if (h2g_valid(e->itree.start)) {
unsigned long min = e->itree.start;
unsigned long max = e->itree.last + 1;
int flags = page_get_flags(h2g(min));
const char *path;
/*
* Callback for walk_memory_regions, when read_self_maps() succeeds.
*/
static int open_self_maps_2(void *opaque, target_ulong guest_start,
target_ulong guest_end, unsigned long flags)
{
const struct open_self_maps_data *d = opaque;
uintptr_t host_start = (uintptr_t)g2h_untagged(guest_start);
uintptr_t host_last = (uintptr_t)g2h_untagged(guest_end - 1);
max = h2g_valid(max - 1) ?
max : (uintptr_t) g2h_untagged(GUEST_ADDR_MAX) + 1;
while (1) {
IntervalTreeNode *n =
interval_tree_iter_first(d->host_maps, host_start, host_start);
MapInfo *mi = container_of(n, MapInfo, itree);
uintptr_t this_hlast = MIN(host_last, n->last);
target_ulong this_gend = h2g(this_hlast) + 1;
if (!page_check_range(h2g(min), max - min, flags)) {
continue;
}
open_self_maps_4(d, mi, guest_start, this_gend, flags);
#ifdef TARGET_HPPA
if (h2g(max) == ts->info->stack_limit) {
#else
if (h2g(min) == ts->info->stack_limit) {
#endif
path = "[stack]";
} else {
path = e->path;
}
count = dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr
" %c%c%c%c %08" PRIx64 " %s %"PRId64,
h2g(min), h2g(max - 1) + 1,
(flags & PAGE_READ) ? 'r' : '-',
(flags & PAGE_WRITE_ORG) ? 'w' : '-',
(flags & PAGE_EXEC) ? 'x' : '-',
e->is_priv ? 'p' : 's',
(uint64_t) e->offset, e->dev, e->inode);
if (path) {
dprintf(fd, "%*s%s\n", 73 - count, "", path);
} else {
dprintf(fd, "\n");
}
if (smaps) {
show_smaps(fd, max - min);
dprintf(fd, "VmFlags:%s%s%s%s%s%s%s%s\n",
(flags & PAGE_READ) ? " rd" : "",
(flags & PAGE_WRITE_ORG) ? " wr" : "",
(flags & PAGE_EXEC) ? " ex" : "",
e->is_priv ? "" : " sh",
(flags & PAGE_READ) ? " mr" : "",
(flags & PAGE_WRITE_ORG) ? " mw" : "",
(flags & PAGE_EXEC) ? " me" : "",
e->is_priv ? "" : " ms");
}
if (this_hlast == host_last) {
return 0;
}
host_start = this_hlast + 1;
guest_start = h2g(host_start);
}
}
free_self_maps(map_info);
static int open_self_maps_1(CPUArchState *env, int fd, bool smaps)
{
struct open_self_maps_data d = {
.ts = env_cpu(env)->opaque,
.host_maps = read_self_maps(),
.fd = fd,
.smaps = smaps
};
#ifdef TARGET_VSYSCALL_PAGE
/*
* We only support execution from the vsyscall page.
* This is as if CONFIG_LEGACY_VSYSCALL_XONLY=y from v5.3.
*/
count = dprintf(fd, TARGET_FMT_lx "-" TARGET_FMT_lx
" --xp 00000000 00:00 0",
TARGET_VSYSCALL_PAGE, TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE);
dprintf(fd, "%*s%s\n", 73 - count, "", "[vsyscall]");
if (smaps) {
show_smaps(fd, TARGET_PAGE_SIZE);
dprintf(fd, "VmFlags: ex\n");
if (d.host_maps) {
walk_memory_regions(&d, open_self_maps_2);
free_self_maps(d.host_maps);
} else {
walk_memory_regions(&d, open_self_maps_3);
}
#endif
return 0;
}
@ -8339,9 +8247,11 @@ void target_exception_dump(CPUArchState *env, const char *fmt, int code)
}
}
#include "target_proc.h"
#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
defined(TARGET_RISCV) || defined(TARGET_S390X)
defined(HAVE_ARCH_PROC_CPUINFO) || \
defined(HAVE_ARCH_PROC_HARDWARE)
static int is_proc(const char *filename, const char *entry)
{
return strcmp(filename, entry) == 0;
@ -8393,171 +8303,6 @@ static int open_net_route(CPUArchState *cpu_env, int fd)
}
#endif
#if defined(TARGET_SPARC)
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
dprintf(fd, "type\t\t: sun4u\n");
return 0;
}
#endif
#if defined(TARGET_HPPA)
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
int i, num_cpus;
num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
for (i = 0; i < num_cpus; i++) {
dprintf(fd, "processor\t: %d\n", i);
dprintf(fd, "cpu family\t: PA-RISC 1.1e\n");
dprintf(fd, "cpu\t\t: PA7300LC (PCX-L2)\n");
dprintf(fd, "capabilities\t: os32\n");
dprintf(fd, "model\t\t: 9000/778/B160L - "
"Merlin L2 160 QEMU (9000/778/B160L)\n\n");
}
return 0;
}
#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_S390X)
/*
* Emulate what a Linux kernel running in qemu-system-s390x -M accel=tcg would
* show in /proc/cpuinfo.
*
* Skip the following in order to match the missing support in op_ecag():
* - show_cacheinfo().
* - show_cpu_topology().
* - show_cpu_mhz().
*
* Use fixed values for certain fields:
* - bogomips per cpu - from a qemu-system-s390x run.
* - max thread id = 0, since SMT / SIGP_SET_MULTI_THREADING is not supported.
*
* Keep the code structure close to arch/s390/kernel/processor.c.
*/
static void show_facilities(int fd)
{
size_t sizeof_stfl_bytes = 2048;
g_autofree uint8_t *stfl_bytes = g_new0(uint8_t, sizeof_stfl_bytes);
unsigned int bit;
dprintf(fd, "facilities :");
s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
for (bit = 0; bit < sizeof_stfl_bytes * 8; bit++) {
if (test_be_bit(bit, stfl_bytes)) {
dprintf(fd, " %d", bit);
}
}
dprintf(fd, "\n");
}
static int cpu_ident(unsigned long n)
{
return deposit32(0, CPU_ID_BITS - CPU_PHYS_ADDR_BITS, CPU_PHYS_ADDR_BITS,
n);
}
static void show_cpu_summary(CPUArchState *cpu_env, int fd)
{
S390CPUModel *model = env_archcpu(cpu_env)->model;
int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
uint32_t elf_hwcap = get_elf_hwcap();
const char *hwcap_str;
int i;
dprintf(fd, "vendor_id : IBM/S390\n"
"# processors : %i\n"
"bogomips per cpu: 13370.00\n",
num_cpus);
dprintf(fd, "max thread id : 0\n");
dprintf(fd, "features\t: ");
for (i = 0; i < sizeof(elf_hwcap) * 8; i++) {
if (!(elf_hwcap & (1 << i))) {
continue;
}
hwcap_str = elf_hwcap_str(i);
if (hwcap_str) {
dprintf(fd, "%s ", hwcap_str);
}
}
dprintf(fd, "\n");
show_facilities(fd);
for (i = 0; i < num_cpus; i++) {
dprintf(fd, "processor %d: "
"version = %02X, "
"identification = %06X, "
"machine = %04X\n",
i, model->cpu_ver, cpu_ident(i), model->def->type);
}
}
static void show_cpu_ids(CPUArchState *cpu_env, int fd, unsigned long n)
{
S390CPUModel *model = env_archcpu(cpu_env)->model;
dprintf(fd, "version : %02X\n", model->cpu_ver);
dprintf(fd, "identification : %06X\n", cpu_ident(n));
dprintf(fd, "machine : %04X\n", model->def->type);
}
static void show_cpuinfo(CPUArchState *cpu_env, int fd, unsigned long n)
{
dprintf(fd, "\ncpu number : %ld\n", n);
show_cpu_ids(cpu_env, fd, n);
}
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
int i;
show_cpu_summary(cpu_env, fd);
for (i = 0; i < num_cpus; i++) {
show_cpuinfo(cpu_env, fd, i);
}
return 0;
}
#endif
#if defined(TARGET_M68K)
static int open_hardware(CPUArchState *cpu_env, int fd)
{
dprintf(fd, "Model:\t\tqemu-m68k\n");
return 0;
}
#endif
int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *fname,
int flags, mode_t mode, bool safe)
{
@ -8578,11 +8323,10 @@ int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *fname,
#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
{ "/proc/net/route", open_net_route, is_proc },
#endif
#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || \
defined(TARGET_RISCV) || defined(TARGET_S390X)
#if defined(HAVE_ARCH_PROC_CPUINFO)
{ "/proc/cpuinfo", open_cpuinfo, is_proc },
#endif
#if defined(TARGET_M68K)
#if defined(HAVE_ARCH_PROC_HARDWARE)
{ "/proc/hardware", open_hardware, is_proc },
#endif
{ NULL, NULL, NULL }
@ -11129,11 +10873,11 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
#endif
#ifdef TARGET_NR_shmat
case TARGET_NR_shmat:
return do_shmat(cpu_env, arg1, arg2, arg3);
return target_shmat(cpu_env, arg1, arg2, arg3);
#endif
#ifdef TARGET_NR_shmdt
case TARGET_NR_shmdt:
return do_shmdt(arg1);
return target_shmdt(arg1);
#endif
case TARGET_NR_fsync:
return get_errno(fsync(arg1));