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target/mips: Use semihosting/syscalls.h

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This separates guest file descriptors from host file descriptors,
and utilizes shared infrastructure for integration with gdbstub.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220628111701.677216-4-richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Richard Henderson 2022-06-28 16:46:56 +05:30 committed by Philippe Mathieu-Daudé
parent 3d748e41c7
commit 18639a28bb
1 changed files with 95 additions and 124 deletions
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219
target/mips/tcg/sysemu/mips-semi.c
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@ -20,9 +20,11 @@
#include "qemu/osdep.h"
#include "cpu.h"
#include "qemu/log.h"
#include "exec/gdbstub.h"
#include "semihosting/softmmu-uaccess.h"
#include "semihosting/semihost.h"
#include "semihosting/console.h"
#include "semihosting/syscalls.h"
#include "internal.h"
typedef enum UHIOp {
@ -121,101 +123,79 @@ static void report_fault(CPUMIPSState *env)
abort();
}
static int errno_mips(int host_errno)
static void uhi_cb(CPUState *cs, uint64_t ret, int err)
{
/* Errno values taken from asm-mips/errno.h */
switch (host_errno) {
case 0: return 0;
case ENAMETOOLONG: return 78;
#ifdef EOVERFLOW
case EOVERFLOW: return 79;
#endif
#ifdef ELOOP
case ELOOP: return 90;
#endif
default: return EINVAL;
}
}
CPUMIPSState *env = cs->env_ptr;
static int copy_stat_to_target(CPUMIPSState *env, const struct stat *src,
target_ulong vaddr)
{
hwaddr len = sizeof(struct UHIStat);
UHIStat *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
if (!dst) {
#define E(N) case E##N: err = UHI_E##N; break
switch (err) {
case 0:
break;
E(PERM);
E(NOENT);
E(INTR);
E(BADF);
E(BUSY);
E(EXIST);
E(NOTDIR);
E(ISDIR);
E(INVAL);
E(NFILE);
E(MFILE);
E(FBIG);
E(NOSPC);
E(SPIPE);
E(ROFS);
E(NAMETOOLONG);
default:
err = UHI_EINVAL;
break;
case EFAULT:
report_fault(env);
}
dst->uhi_st_dev = tswap16(src->st_dev);
dst->uhi_st_ino = tswap16(src->st_ino);
dst->uhi_st_mode = tswap32(src->st_mode);
dst->uhi_st_nlink = tswap16(src->st_nlink);
dst->uhi_st_uid = tswap16(src->st_uid);
dst->uhi_st_gid = tswap16(src->st_gid);
dst->uhi_st_rdev = tswap16(src->st_rdev);
dst->uhi_st_size = tswap64(src->st_size);
dst->uhi_st_atime = tswap64(src->st_atime);
dst->uhi_st_mtime = tswap64(src->st_mtime);
dst->uhi_st_ctime = tswap64(src->st_ctime);
#ifdef _WIN32
dst->uhi_st_blksize = 0;
dst->uhi_st_blocks = 0;
#else
dst->uhi_st_blksize = tswap64(src->st_blksize);
dst->uhi_st_blocks = tswap64(src->st_blocks);
#endif
unlock_user(dst, vaddr, len);
return 0;
#undef E
env->active_tc.gpr[2] = ret;
env->active_tc.gpr[3] = err;
}
static int get_open_flags(target_ulong target_flags)
static void uhi_fstat_cb(CPUState *cs, uint64_t ret, int err)
{
int open_flags = 0;
QEMU_BUILD_BUG_ON(sizeof(UHIStat) < sizeof(struct gdb_stat));
if (target_flags & UHIOpen_RDWR) {
open_flags |= O_RDWR;
} else if (target_flags & UHIOpen_WRONLY) {
open_flags |= O_WRONLY;
} else {
open_flags |= O_RDONLY;
if (!err) {
CPUMIPSState *env = cs->env_ptr;
target_ulong addr = env->active_tc.gpr[5];
UHIStat *dst = lock_user(VERIFY_WRITE, addr, sizeof(UHIStat), 1);
struct gdb_stat s;
if (!dst) {
report_fault(env);
}
memcpy(&s, dst, sizeof(struct gdb_stat));
memset(dst, 0, sizeof(UHIStat));
dst->uhi_st_dev = tswap16(be32_to_cpu(s.gdb_st_dev));
dst->uhi_st_ino = tswap16(be32_to_cpu(s.gdb_st_ino));
dst->uhi_st_mode = tswap32(be32_to_cpu(s.gdb_st_mode));
dst->uhi_st_nlink = tswap16(be32_to_cpu(s.gdb_st_nlink));
dst->uhi_st_uid = tswap16(be32_to_cpu(s.gdb_st_uid));
dst->uhi_st_gid = tswap16(be32_to_cpu(s.gdb_st_gid));
dst->uhi_st_rdev = tswap16(be32_to_cpu(s.gdb_st_rdev));
dst->uhi_st_size = tswap64(be64_to_cpu(s.gdb_st_size));
dst->uhi_st_atime = tswap64(be32_to_cpu(s.gdb_st_atime));
dst->uhi_st_mtime = tswap64(be32_to_cpu(s.gdb_st_mtime));
dst->uhi_st_ctime = tswap64(be32_to_cpu(s.gdb_st_ctime));
dst->uhi_st_blksize = tswap64(be64_to_cpu(s.gdb_st_blksize));
dst->uhi_st_blocks = tswap64(be64_to_cpu(s.gdb_st_blocks));
unlock_user(dst, addr, sizeof(UHIStat));
}
open_flags |= (target_flags & UHIOpen_APPEND) ? O_APPEND : 0;
open_flags |= (target_flags & UHIOpen_CREAT) ? O_CREAT : 0;
open_flags |= (target_flags & UHIOpen_TRUNC) ? O_TRUNC : 0;
open_flags |= (target_flags & UHIOpen_EXCL) ? O_EXCL : 0;
return open_flags;
}
static int write_to_file(CPUMIPSState *env, target_ulong fd,
target_ulong vaddr, target_ulong len)
{
int num_of_bytes;
void *dst = lock_user(VERIFY_READ, vaddr, len, 1);
if (!dst) {
report_fault(env);
}
num_of_bytes = write(fd, dst, len);
unlock_user(dst, vaddr, 0);
return num_of_bytes;
}
static int read_from_file(CPUMIPSState *env, target_ulong fd,
target_ulong vaddr, target_ulong len)
{
int num_of_bytes;
void *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
if (!dst) {
report_fault(env);
}
num_of_bytes = read(fd, dst, len);
unlock_user(dst, vaddr, len);
return num_of_bytes;
uhi_cb(cs, ret, err);
}
static int copy_argn_to_target(CPUMIPSState *env, int arg_num,
@ -260,68 +240,59 @@ static int copy_argn_to_target(CPUMIPSState *env, int arg_num,
void mips_semihosting(CPUMIPSState *env)
{
CPUState *cs = env_cpu(env);
target_ulong *gpr = env->active_tc.gpr;
const UHIOp op = gpr[25];
char *p, *p2;
switch (op) {
case UHI_exit:
qemu_log("UHI(%d): exit(%d)\n", op, (int)gpr[4]);
gdb_exit(gpr[4]);
exit(gpr[4]);
case UHI_open:
GET_TARGET_STRING(p, gpr[4]);
if (!strcmp("/dev/stdin", p)) {
gpr[2] = 0;
} else if (!strcmp("/dev/stdout", p)) {
gpr[2] = 1;
} else if (!strcmp("/dev/stderr", p)) {
gpr[2] = 2;
} else {
gpr[2] = open(p, get_open_flags(gpr[5]), gpr[6]);
gpr[3] = errno_mips(errno);
{
int ret = -1;
GET_TARGET_STRING(p, gpr[4]);
if (!strcmp("/dev/stdin", p)) {
ret = 0;
} else if (!strcmp("/dev/stdout", p)) {
ret = 1;
} else if (!strcmp("/dev/stderr", p)) {
ret = 2;
}
FREE_TARGET_STRING(p, gpr[4]);
/* FIXME: reusing a guest fd doesn't seem correct. */
if (ret >= 0) {
gpr[2] = ret;
break;
}
semihost_sys_open(cs, uhi_cb, gpr[4], 0, gpr[5], gpr[6]);
}
FREE_TARGET_STRING(p, gpr[4]);
break;
case UHI_close:
if (gpr[4] < 3) {
/* ignore closing stdin/stdout/stderr */
gpr[2] = 0;
return;
}
gpr[2] = close(gpr[4]);
gpr[3] = errno_mips(errno);
semihost_sys_close(cs, uhi_cb, gpr[4]);
break;
case UHI_read:
gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6]);
gpr[3] = errno_mips(errno);
semihost_sys_read(cs, uhi_cb, gpr[4], gpr[5], gpr[6]);
break;
case UHI_write:
gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6]);
gpr[3] = errno_mips(errno);
semihost_sys_write(cs, uhi_cb, gpr[4], gpr[5], gpr[6]);
break;
case UHI_lseek:
gpr[2] = lseek(gpr[4], gpr[5], gpr[6]);
gpr[3] = errno_mips(errno);
semihost_sys_lseek(cs, uhi_cb, gpr[4], gpr[5], gpr[6]);
break;
case UHI_unlink:
GET_TARGET_STRING(p, gpr[4]);
gpr[2] = remove(p);
gpr[3] = errno_mips(errno);
FREE_TARGET_STRING(p, gpr[4]);
semihost_sys_remove(cs, uhi_cb, gpr[4], 0);
break;
case UHI_fstat:
{
struct stat sbuf;
memset(&sbuf, 0, sizeof(sbuf));
gpr[2] = fstat(gpr[4], &sbuf);
gpr[3] = errno_mips(errno);
if (gpr[2]) {
return;
}
gpr[2] = copy_stat_to_target(env, &sbuf, gpr[5]);
gpr[3] = errno_mips(errno);
}
semihost_sys_fstat(cs, uhi_fstat_cb, gpr[4], gpr[5]);
break;
case UHI_argc:
gpr[2] = semihosting_get_argc();
break;