diff options
| -rw-r--r-- | gdbstub.c | 42 |
1 files changed, 27 insertions, 15 deletions
@@ -284,7 +284,6 @@ enum RSState { RS_GETLINE, RS_CHKSUM1, RS_CHKSUM2, - RS_SYSCALL, }; typedef struct GDBState { CPUArchState *c_cpu; /* current CPU for step/continue ops */ @@ -304,6 +303,8 @@ typedef struct GDBState { CharDriverState *chr; CharDriverState *mon_chr; #endif + char syscall_buf[256]; + gdb_syscall_complete_cb current_syscall_cb; } GDBState; /* By default use no IRQs and no timers while single stepping so as to @@ -346,8 +347,6 @@ static int get_char(GDBState *s) } #endif -static gdb_syscall_complete_cb gdb_current_syscall_cb; - static enum { GDB_SYS_UNKNOWN, GDB_SYS_ENABLED, @@ -2097,8 +2096,10 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) if (*p == ',') p++; type = *p; - if (gdb_current_syscall_cb) - gdb_current_syscall_cb(s->c_cpu, ret, err); + if (s->current_syscall_cb) { + s->current_syscall_cb(s->c_cpu, ret, err); + s->current_syscall_cb = NULL; + } if (type == 'C') { put_packet(s, "T02"); } else { @@ -2398,7 +2399,12 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state) const char *type; int ret; - if (running || s->state == RS_INACTIVE || s->state == RS_SYSCALL) { + if (running || s->state == RS_INACTIVE) { + return; + } + /* Is there a GDB syscall waiting to be sent? */ + if (s->current_syscall_cb) { + put_packet(s, s->syscall_buf); return; } switch (state) { @@ -2468,8 +2474,8 @@ send_packet: void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) { va_list va; - char buf[256]; char *p; + char *p_end; target_ulong addr; uint64_t i64; GDBState *s; @@ -2477,14 +2483,13 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) s = gdbserver_state; if (!s) return; - gdb_current_syscall_cb = cb; - s->state = RS_SYSCALL; + s->current_syscall_cb = cb; #ifndef CONFIG_USER_ONLY vm_stop(RUN_STATE_DEBUG); #endif - s->state = RS_IDLE; va_start(va, fmt); - p = buf; + p = s->syscall_buf; + p_end = &s->syscall_buf[sizeof(s->syscall_buf)]; *(p++) = 'F'; while (*fmt) { if (*fmt == '%') { @@ -2492,17 +2497,17 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) switch (*fmt++) { case 'x': addr = va_arg(va, target_ulong); - p += snprintf(p, &buf[sizeof(buf)] - p, TARGET_FMT_lx, addr); + p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); break; case 'l': if (*(fmt++) != 'x') goto bad_format; i64 = va_arg(va, uint64_t); - p += snprintf(p, &buf[sizeof(buf)] - p, "%" PRIx64, i64); + p += snprintf(p, p_end - p, "%" PRIx64, i64); break; case 's': addr = va_arg(va, target_ulong); - p += snprintf(p, &buf[sizeof(buf)] - p, TARGET_FMT_lx "/%x", + p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x", addr, va_arg(va, int)); break; default: @@ -2517,10 +2522,16 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) } *p = 0; va_end(va); - put_packet(s, buf); #ifdef CONFIG_USER_ONLY + put_packet(s, s->syscall_buf); gdb_handlesig(s->c_cpu, 0); #else + /* In this case wait to send the syscall packet until notification that + the CPU has stopped. This must be done because if the packet is sent + now the reply from the syscall request could be received while the CPU + is still in the running state, which can cause packets to be dropped + and state transition 'T' packets to be sent while the syscall is still + being processed. */ cpu_exit(s->c_cpu); #endif } @@ -2919,6 +2930,7 @@ int gdbserver_start(const char *device) s->chr = chr; s->state = chr ? RS_IDLE : RS_INACTIVE; s->mon_chr = mon_chr; + s->current_syscall_cb = NULL; return 0; } |