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semihosting: create SemihostingConfig structure and semihost.h 

Remove semihosting_enabled and semihosting_target and replace them with
SemihostingConfig structure containing equivalent fields. The structure
is defined in vl.c where it is actually set.

Also introduce separate header file include/exec/semihost.h allowing to
access semihosting config related stuff from target specific semihosting
code.

Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1434643256-16858-2-git-send-email-leon.alrae@imgtec.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Leon Alrae 2015-06-19 14:17:45 +01:00 committed by Peter Maydell
parent b58850e79d
commit cfe67cef48
9 changed files with 87 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gdbstub.c
View File

@ -40,6 +40,7 @@
#include "cpu.h"
#include "qemu/sockets.h"
#include "sysemu/kvm.h"
#include "exec/semihost.h"
#ifdef CONFIG_USER_ONLY
#define GDB_ATTACHED "0"
@ -323,8 +324,6 @@ static GDBState *gdbserver_state;
bool gdb_has_xml;
int semihosting_target = SEMIHOSTING_TARGET_AUTO;
#ifdef CONFIG_USER_ONLY
/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
@ -362,10 +361,11 @@ static enum {
/* Decide if either remote gdb syscalls or native file IO should be used. */
int use_gdb_syscalls(void)
{
if (semihosting_target == SEMIHOSTING_TARGET_NATIVE) {
SemihostingTarget target = semihosting_get_target();
if (target == SEMIHOSTING_TARGET_NATIVE) {
/* -semihosting-config target=native */
return false;
} else if (semihosting_target == SEMIHOSTING_TARGET_GDB) {
} else if (target == SEMIHOSTING_TARGET_GDB) {
/* -semihosting-config target=gdb */
return true;
}

6
include/exec/gdbstub.h
View File

@ -95,10 +95,4 @@ extern bool gdb_has_xml;
/* in gdbstub-xml.c, generated by scripts/feature_to_c.sh */
extern const char *const xml_builtin[][2];
/* Command line option defining whether semihosting should go via gdb or not */
extern int semihosting_target;
#define SEMIHOSTING_TARGET_AUTO 0
#define SEMIHOSTING_TARGET_NATIVE 1
#define SEMIHOSTING_TARGET_GDB 2
#endif

44
include/exec/semihost.h Normal file
View File

@ -0,0 +1,44 @@
/*
* Semihosting support
*
* Copyright (c) 2015 Imagination Technologies
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SEMIHOST_H
#define SEMIHOST_H
typedef enum SemihostingTarget {
SEMIHOSTING_TARGET_AUTO = 0,
SEMIHOSTING_TARGET_NATIVE,
SEMIHOSTING_TARGET_GDB
} SemihostingTarget;
#ifdef CONFIG_USER_ONLY
static inline bool semihosting_enabled(void)
{
return true;
}
static inline SemihostingTarget semihosting_get_target(void)
{
return SEMIHOSTING_TARGET_AUTO;
}
#else
bool semihosting_enabled(void);
SemihostingTarget semihosting_get_target(void);
#endif
#endif

1
include/sysemu/sysemu.h
View File

@ -126,7 +126,6 @@ extern int cursor_hide;
extern int graphic_rotate;
extern int no_quit;
extern int no_shutdown;
extern int semihosting_enabled;
extern int old_param;
extern int boot_menu;
extern bool boot_strict;

7
target-arm/helper.c
View File

@ -10,6 +10,7 @@
#include "exec/cpu_ldst.h"
#include "arm_ldst.h"
#include <zlib.h> /* For crc32 */
#include "exec/semihost.h"
#ifndef CONFIG_USER_ONLY
static inline bool get_phys_addr(CPUARMState *env, target_ulong address,
@ -4554,7 +4555,7 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_MEM);
return;
case EXCP_BKPT:
if (semihosting_enabled) {
if (semihosting_enabled()) {
int nr;
nr = arm_lduw_code(env, env->regs[15], env->bswap_code) & 0xff;
if (nr == 0xab) {
@ -4866,7 +4867,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
offset = 4;
break;
case EXCP_SWI:
if (semihosting_enabled) {
if (semihosting_enabled()) {
/* Check for semihosting interrupt. */
if (env->thumb) {
mask = arm_lduw_code(env, env->regs[15] - 2, env->bswap_code)
@ -4893,7 +4894,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
break;
case EXCP_BKPT:
/* See if this is a semihosting syscall. */
if (env->thumb && semihosting_enabled) {
if (env->thumb && semihosting_enabled()) {
mask = arm_lduw_code(env, env->regs[15], env->bswap_code) & 0xff;
if (mask == 0xab
&& (env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR) {

3
target-lm32/helper.c
View File

@ -20,6 +20,7 @@
#include "cpu.h"
#include "qemu/host-utils.h"
#include "sysemu/sysemu.h"
#include "exec/semihost.h"
int lm32_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
int mmu_idx)
@ -162,7 +163,7 @@ void lm32_cpu_do_interrupt(CPUState *cs)
switch (cs->exception_index) {
case EXCP_SYSTEMCALL:
if (unlikely(semihosting_enabled)) {
if (unlikely(semihosting_enabled())) {
/* do_semicall() returns true if call was handled. Otherwise
* do the normal exception handling. */
if (lm32_cpu_do_semihosting(cs)) {

5
target-m68k/op_helper.c
View File

@ -19,6 +19,7 @@
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
#include "exec/semihost.h"
#if defined(CONFIG_USER_ONLY)
@ -33,8 +34,6 @@ static inline void do_interrupt_m68k_hardirq(CPUM68KState *env)
#else
extern int semihosting_enabled;
/* Try to fill the TLB and return an exception if error. If retaddr is
NULL, it means that the function was called in C code (i.e. not
from generated code or from helper.c) */
@ -85,7 +84,7 @@ static void do_interrupt_all(CPUM68KState *env, int is_hw)
do_rte(env);
return;
case EXCP_HALT_INSN:
if (semihosting_enabled
if (semihosting_enabled()
&& (env->sr & SR_S) != 0
&& (env->pc & 3) == 0
&& cpu_lduw_code(env, env->pc - 4) == 0x4e71

3
target-xtensa/translate.c
View File

@ -37,6 +37,7 @@
#include "qemu/log.h"
#include "sysemu/sysemu.h"
#include "exec/cpu_ldst.h"
#include "exec/semihost.h"
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
@ -1216,7 +1217,7 @@ static void disas_xtensa_insn(CPUXtensaState *env, DisasContext *dc)
break;
case 1: /*SIMCALL*/
if (semihosting_enabled) {
if (semihosting_enabled()) {
if (gen_check_privilege(dc)) {
gen_helper_simcall(cpu_env);
}

38
vl.c
View File

@ -119,6 +119,7 @@ int main(int argc, char **argv)
#include "qapi/opts-visitor.h"
#include "qom/object_interfaces.h"
#include "qapi-event.h"
#include "exec/semihost.h"
#define MAX_VIRTIO_CONSOLES 1
#define MAX_SCLP_CONSOLES 1
@ -169,7 +170,6 @@ int graphic_rotate = 0;
const char *watchdog;
QEMUOptionRom option_rom[MAX_OPTION_ROMS];
int nb_option_roms;
int semihosting_enabled = 0;
int old_param = 0;
const char *qemu_name;
int alt_grab = 0;
@ -1245,6 +1245,26 @@ static void configure_msg(QemuOpts *opts)
enable_timestamp_msg = qemu_opt_get_bool(opts, "timestamp", true);
}
/***********************************************************/
/* Semihosting */
typedef struct SemihostingConfig {
bool enabled;
SemihostingTarget target;
} SemihostingConfig;
static SemihostingConfig semihosting;
bool semihosting_enabled(void)
{
return semihosting.enabled;
}
SemihostingTarget semihosting_get_target(void)
{
return semihosting.target;
}
/***********************************************************/
/* USB devices */
@ -3622,24 +3642,24 @@ int main(int argc, char **argv, char **envp)
nb_option_roms++;
break;
case QEMU_OPTION_semihosting:
semihosting_enabled = 1;
semihosting_target = SEMIHOSTING_TARGET_AUTO;
semihosting.enabled = true;
semihosting.target = SEMIHOSTING_TARGET_AUTO;
break;
case QEMU_OPTION_semihosting_config:
semihosting_enabled = 1;
semihosting.enabled = true;
opts = qemu_opts_parse(qemu_find_opts("semihosting-config"),
optarg, 0);
if (opts != NULL) {
semihosting_enabled = qemu_opt_get_bool(opts, "enable",
semihosting.enabled = qemu_opt_get_bool(opts, "enable",
true);
const char *target = qemu_opt_get(opts, "target");
if (target != NULL) {
if (strcmp("native", target) == 0) {
semihosting_target = SEMIHOSTING_TARGET_NATIVE;
semihosting.target = SEMIHOSTING_TARGET_NATIVE;
} else if (strcmp("gdb", target) == 0) {
semihosting_target = SEMIHOSTING_TARGET_GDB;
semihosting.target = SEMIHOSTING_TARGET_GDB;
} else if (strcmp("auto", target) == 0) {
semihosting_target = SEMIHOSTING_TARGET_AUTO;
semihosting.target = SEMIHOSTING_TARGET_AUTO;
} else {
fprintf(stderr, "Unsupported semihosting-config"
" %s\n",
@ -3647,7 +3667,7 @@ int main(int argc, char **argv, char **envp)
exit(1);
}
} else {
semihosting_target = SEMIHOSTING_TARGET_AUTO;
semihosting.target = SEMIHOSTING_TARGET_AUTO;
}
} else {
fprintf(stderr, "Unsupported semihosting-config %s\n",