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bsd-user/bsd-file.h: Add implementations for read, pread, readv and preadv 

Implement do_bsd_{read,pread,readv,preadv}. Connect them to the system
call table.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-31 16:10:10 -07:00
parent db69788703
commit 80da1b0088
2 changed files with 107 additions and 0 deletions
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79
bsd-user/bsd-file.h
View File

@ -27,4 +27,83 @@ extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
int copy);
ssize_t safe_read(int fd, void *buf, size_t nbytes);
ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
/* read(2) */
static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long ret;
void *p;
p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
if (p == NULL) {
return -TARGET_EFAULT;
}
ret = get_errno(safe_read(arg1, p, arg3));
unlock_user(p, arg2, ret);
return ret;
}
/* pread(2) */
static abi_long do_bsd_pread(void *cpu_env, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
abi_long ret;
void *p;
p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
if (p == NULL) {
return -TARGET_EFAULT;
}
if (regpairs_aligned(cpu_env) != 0) {
arg4 = arg5;
arg5 = arg6;
}
ret = get_errno(safe_pread(arg1, p, arg3, target_arg64(arg4, arg5)));
unlock_user(p, arg2, ret);
return ret;
}
/* readv(2) */
static abi_long do_bsd_readv(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long ret;
struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
if (vec != NULL) {
ret = get_errno(safe_readv(arg1, vec, arg3));
unlock_iovec(vec, arg2, arg3, 1);
} else {
ret = -host_to_target_errno(errno);
}
return ret;
}
/* preadv(2) */
static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
abi_long ret;
struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 1);
if (vec != NULL) {
if (regpairs_aligned(cpu_env) != 0) {
arg4 = arg5;
arg5 = arg6;
}
ret = get_errno(safe_preadv(arg1, vec, arg3, target_arg64(arg4, arg5)));
unlock_iovec(vec, arg2, arg3, 0);
} else {
ret = -host_to_target_errno(errno);
}
return ret;
}
#endif /* BSD_FILE_H */

28
bsd-user/freebsd/os-syscall.c
View File

@ -42,6 +42,14 @@
#include "bsd-file.h"
/* I/O */
safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes);
safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t,
offset);
safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt);
safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt,
off_t, offset);
void target_set_brk(abi_ulong new_brk)
{
}
@ -200,6 +208,26 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
abi_long ret;
switch (num) {
/*
* File system calls.
*/
case TARGET_FREEBSD_NR_read: /* read(2) */
ret = do_bsd_read(arg1, arg2, arg3);
break;
case TARGET_FREEBSD_NR_pread: /* pread(2) */
ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
break;
case TARGET_FREEBSD_NR_readv: /* readv(2) */
ret = do_bsd_readv(arg1, arg2, arg3);
break;
case TARGET_FREEBSD_NR_preadv: /* preadv(2) */
ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
break;
default:
qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
ret = -TARGET_ENOSYS;