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a38bb0792c
The usual semihosting behaviour is to process the system calls locally and
return; unfortuantelly the initial implementation dinamically changed the
target to GDB during debug sessions, which, for the usual arm-none-eabi-gdb,
is not implemented. The result was that during debug sessions the semihosting
calls were discarded.
This patch adds a configuration variable and an option to set it on the
command line:
-semihosting-config [enable=on|off,]target=native|gdb|auto
This option enables semihosting and defines where the semihosting calls will
be addressed, to QEMU ('native') or to GDB ('gdb'). The default is auto, which
means 'gdb' during debug sessions and 'native' otherwise.
Signed-off-by: Liviu Ionescu <ilg@livius.net>
Message-id: 1416341957-9796-1-git-send-email-ilg@livius.net
[PMM: moved declaration and definition of semihosting_target to
gdbstub.h and gdbstub.c to fix build failure on linux-user]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
#ifndef GDBSTUB_H
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#define GDBSTUB_H
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#define DEFAULT_GDBSTUB_PORT "1234"
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/* GDB breakpoint/watchpoint types */
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#define GDB_BREAKPOINT_SW 0
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#define GDB_BREAKPOINT_HW 1
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#define GDB_WATCHPOINT_WRITE 2
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#define GDB_WATCHPOINT_READ 3
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#define GDB_WATCHPOINT_ACCESS 4
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#ifdef NEED_CPU_H
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typedef void (*gdb_syscall_complete_cb)(CPUState *cpu,
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target_ulong ret, target_ulong err);
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void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...);
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int use_gdb_syscalls(void);
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void gdb_set_stop_cpu(CPUState *cpu);
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void gdb_exit(CPUArchState *, int);
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#ifdef CONFIG_USER_ONLY
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int gdb_queuesig (void);
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int gdb_handlesig(CPUState *, int);
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void gdb_signalled(CPUArchState *, int);
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void gdbserver_fork(CPUArchState *);
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#endif
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/* Get or set a register. Returns the size of the register. */
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typedef int (*gdb_reg_cb)(CPUArchState *env, uint8_t *buf, int reg);
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void gdb_register_coprocessor(CPUState *cpu,
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gdb_reg_cb get_reg, gdb_reg_cb set_reg,
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int num_regs, const char *xml, int g_pos);
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static inline int cpu_index(CPUState *cpu)
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{
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#if defined(CONFIG_USER_ONLY)
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return cpu->host_tid;
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#else
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return cpu->cpu_index + 1;
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#endif
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}
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/* The GDB remote protocol transfers values in target byte order. This means
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* we can use the raw memory access routines to access the value buffer.
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* Conveniently, these also handle the case where the buffer is mis-aligned.
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*/
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static inline int gdb_get_reg8(uint8_t *mem_buf, uint8_t val)
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{
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stb_p(mem_buf, val);
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return 1;
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}
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static inline int gdb_get_reg16(uint8_t *mem_buf, uint16_t val)
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{
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stw_p(mem_buf, val);
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return 2;
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}
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static inline int gdb_get_reg32(uint8_t *mem_buf, uint32_t val)
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{
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stl_p(mem_buf, val);
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return 4;
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}
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static inline int gdb_get_reg64(uint8_t *mem_buf, uint64_t val)
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{
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stq_p(mem_buf, val);
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return 8;
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}
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#if TARGET_LONG_BITS == 64
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#define gdb_get_regl(buf, val) gdb_get_reg64(buf, val)
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#define ldtul_p(addr) ldq_p(addr)
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#else
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#define gdb_get_regl(buf, val) gdb_get_reg32(buf, val)
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#define ldtul_p(addr) ldl_p(addr)
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#endif
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#endif
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#ifdef CONFIG_USER_ONLY
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int gdbserver_start(int);
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#else
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int gdbserver_start(const char *port);
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#endif
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/**
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* gdb_has_xml:
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* This is an ugly hack to cope with both new and old gdb.
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* If gdb sends qXfer:features:read then assume we're talking to a newish
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* gdb that understands target descriptions.
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*/
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extern bool gdb_has_xml;
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/* in gdbstub-xml.c, generated by scripts/feature_to_c.sh */
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extern const char *const xml_builtin[][2];
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/* Command line option defining whether semihosting should go via gdb or not */
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extern int semihosting_target;
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#define SEMIHOSTING_TARGET_AUTO 0
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#define SEMIHOSTING_TARGET_NATIVE 1
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#define SEMIHOSTING_TARGET_GDB 2
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#endif
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