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-rw-r--r--semihosting/arm-compat-semi.c51
-rw-r--r--semihosting/syscalls.c81
2 files changed, 94 insertions, 38 deletions
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index d591fcd..a117d18 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -224,16 +224,6 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
#else
syscall_err = err;
#endif
- } else {
- /* Fixup syscalls that use nonstardard return conventions. */
- target_ulong reg0 = common_semi_arg(cs, 0);
- switch (reg0) {
- case TARGET_SYS_SEEK:
- ret = 0;
- break;
- default:
- break;
- }
}
common_semi_set_ret(cs, ret);
}
@@ -258,6 +248,18 @@ static void common_semi_rw_cb(CPUState *cs, target_ulong ret, target_ulong err)
}
/*
+ * SYS_SEEK returns 0 on success, not the resulting offset.
+ */
+static void common_semi_seek_cb(CPUState *cs, target_ulong ret,
+ target_ulong err)
+{
+ if (!err) {
+ ret = 0;
+ }
+ common_semi_cb(cs, ret, err);
+}
+
+/*
* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
* is defined by GDB's remote protocol and is not target-specific.)
@@ -290,7 +292,6 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
* via common_semi_cb.
*/
typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
-typedef void sys_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset);
typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
static void host_isattyfn(CPUState *cs, GuestFD *gf)
@@ -298,12 +299,6 @@ static void host_isattyfn(CPUState *cs, GuestFD *gf)
common_semi_cb(cs, isatty(gf->hostfd), 0);
}
-static void host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- off_t ret = lseek(gf->hostfd, offset, SEEK_SET);
- common_semi_cb(cs, ret, ret == -1 ? errno : 0);
-}
-
static void host_flenfn(CPUState *cs, GuestFD *gf)
{
struct stat buf;
@@ -320,11 +315,6 @@ static void gdb_isattyfn(CPUState *cs, GuestFD *gf)
gdb_do_syscall(common_semi_cb, "isatty,%x", gf->hostfd);
}
-static void gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- gdb_do_syscall(common_semi_cb, "lseek,%x,%x,0", gf->hostfd, offset);
-}
-
static void gdb_flenfn(CPUState *cs, GuestFD *gf)
{
gdb_do_syscall(common_semi_flen_cb, "fstat,%x,%x",
@@ -353,12 +343,6 @@ static void staticfile_isattyfn(CPUState *cs, GuestFD *gf)
common_semi_cb(cs, 0, 0);
}
-static void staticfile_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- gf->staticfile.off = offset;
- common_semi_cb(cs, 0, 0);
-}
-
static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, gf->staticfile.len, 0);
@@ -366,24 +350,20 @@ static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
typedef struct GuestFDFunctions {
sys_isattyfn *isattyfn;
- sys_seekfn *seekfn;
sys_flenfn *flenfn;
} GuestFDFunctions;
static const GuestFDFunctions guestfd_fns[] = {
[GuestFDHost] = {
.isattyfn = host_isattyfn,
- .seekfn = host_seekfn,
.flenfn = host_flenfn,
},
[GuestFDGDB] = {
.isattyfn = gdb_isattyfn,
- .seekfn = gdb_seekfn,
.flenfn = gdb_flenfn,
},
[GuestFDStatic] = {
.isattyfn = staticfile_isattyfn,
- .seekfn = staticfile_seekfn,
.flenfn = staticfile_flenfn,
},
};
@@ -520,12 +500,7 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].seekfn(cs, gf, arg1);
+ semihost_sys_lseek(cs, common_semi_seek_cb, arg0, arg1, GDB_SEEK_SET);
break;
case TARGET_SYS_FLEN:
diff --git a/semihosting/syscalls.c b/semihosting/syscalls.c
index eefbae7..9e3eb46 100644
--- a/semihosting/syscalls.c
+++ b/semihosting/syscalls.c
@@ -114,6 +114,13 @@ static void gdb_write(CPUState *cs, gdb_syscall_complete_cb complete,
(target_ulong)gf->hostfd, buf, len);
}
+static void gdb_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, int64_t off, int gdb_whence)
+{
+ gdb_do_syscall(complete, "lseek,%x,%lx,%x",
+ (target_ulong)gf->hostfd, off, (target_ulong)gdb_whence);
+}
+
/*
* Host semihosting syscall implementations.
*/
@@ -216,6 +223,29 @@ static void host_write(CPUState *cs, gdb_syscall_complete_cb complete,
unlock_user(ptr, buf, 0);
}
+static void host_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, int64_t off, int whence)
+{
+ /* So far, all hosts use the same values. */
+ QEMU_BUILD_BUG_ON(GDB_SEEK_SET != SEEK_SET);
+ QEMU_BUILD_BUG_ON(GDB_SEEK_CUR != SEEK_CUR);
+ QEMU_BUILD_BUG_ON(GDB_SEEK_END != SEEK_END);
+
+ off_t ret = off;
+ int err = 0;
+
+ if (ret == off) {
+ ret = lseek(gf->hostfd, ret, whence);
+ if (ret == -1) {
+ err = errno;
+ }
+ } else {
+ ret = -1;
+ err = EINVAL;
+ }
+ complete(cs, ret, err);
+}
+
/*
* Static file semihosting syscall implementations.
*/
@@ -241,6 +271,33 @@ static void staticfile_read(CPUState *cs, gdb_syscall_complete_cb complete,
unlock_user(ptr, buf, len);
}
+static void staticfile_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, int64_t off, int gdb_whence)
+{
+ int64_t ret;
+
+ switch (gdb_whence) {
+ case GDB_SEEK_SET:
+ ret = off;
+ break;
+ case GDB_SEEK_CUR:
+ ret = gf->staticfile.off + off;
+ break;
+ case GDB_SEEK_END:
+ ret = gf->staticfile.len + off;
+ break;
+ default:
+ ret = -1;
+ break;
+ }
+ if (ret >= 0 && ret <= gf->staticfile.len) {
+ gf->staticfile.off = ret;
+ complete(cs, ret, 0);
+ } else {
+ complete(cs, -1, EINVAL);
+ }
+}
+
/*
* Syscall entry points.
*/
@@ -356,3 +413,27 @@ void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
complete(cs, -1, EBADF);
}
}
+
+void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, int64_t off, int gdb_whence)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ complete(cs, -1, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_lseek(cs, complete, gf, off, gdb_whence);
+ return;
+ case GuestFDHost:
+ host_lseek(cs, complete, gf, off, gdb_whence);
+ break;
+ case GuestFDStatic:
+ staticfile_lseek(cs, complete, gf, off, gdb_whence);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}