gwj / at91sam9263 · Commits

Commit 7d03f82f81e0e6c106ca0d2445a0fc49dc9ddc7b

Authored by edgar_igl
1 parent 6191b059

Add support for the 'k' (kill) and 'D' (detach) packets (Jason Wessel). 

Implement the 'k' gdbserial packet which kills the qemu instance via
the debugger stub.

Implement the 'D' detach packet for the gdb stub such that you can
disconnect gdb with the "detach" command.  This required implementing
a cpu_breakpoint_remove_all() and a cpu_watchpoint_remove_all()
function to cleanup all the breakpoints and watchpoints prior to
leaving the gdb stub else simulation can stop with no debugger
attached.

On a '?' packet remove all the breakpoints and watchpoints.  This is
considered more of a safety net in case you force killed gdb or it
crashed and you are reconnecting.  The identical behavior exists for
kgdb in the linux kernel.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4478 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 3 changed files with 40 additions and 0 deletions
cpu-all.h
  View file @7d03f82
... ... @@ -760,8 +760,10 @@ void cpu_reset_interrupt(CPUState *env, int mask);
760 760  
761 761 int cpu_watchpoint_insert(CPUState *env, target_ulong addr);
762 762 int cpu_watchpoint_remove(CPUState *env, target_ulong addr);
  763 +void cpu_watchpoint_remove_all(CPUState *env);
763 764 int cpu_breakpoint_insert(CPUState *env, target_ulong pc);
764 765 int cpu_breakpoint_remove(CPUState *env, target_ulong pc);
  766 +void cpu_breakpoint_remove_all(CPUState *env);
765 767  
766 768 #define SSTEP_ENABLE 0x1 /* Enable simulated HW single stepping */
767 769 #define SSTEP_NOIRQ 0x2 /* Do not use IRQ while single stepping */
... ...
... ... @@ -1139,6 +1139,16 @@ int cpu_watchpoint_remove(CPUState *env, target_ulong addr)
1139 1139 return -1;
1140 1140 }
1141 1141  
  1142 +/* Remove all watchpoints. */
  1143 +void cpu_watchpoint_remove_all(CPUState *env) {
  1144 + int i;
  1145 +
  1146 + for (i = 0; i < env->nb_watchpoints; i++) {
  1147 + tlb_flush_page(env, env->watchpoint[i].vaddr);
  1148 + }
  1149 + env->nb_watchpoints = 0;
  1150 +}
  1151 +
1142 1152 /* add a breakpoint. EXCP_DEBUG is returned by the CPU loop if a
1143 1153 breakpoint is reached */
1144 1154 int cpu_breakpoint_insert(CPUState *env, target_ulong pc)
... ... @@ -1162,6 +1172,17 @@ int cpu_breakpoint_insert(CPUState *env, target_ulong pc)
1162 1172 #endif
1163 1173 }
1164 1174  
  1175 +/* remove all breakpoints */
  1176 +void cpu_breakpoint_remove_all(CPUState *env) {
  1177 +#if defined(TARGET_HAS_ICE)
  1178 + int i;
  1179 + for(i = 0; i < env->nb_breakpoints; i++) {
  1180 + breakpoint_invalidate(env, env->breakpoints[i]);
  1181 + }
  1182 + env->nb_breakpoints = 0;
  1183 +#endif
  1184 +}
  1185 +
1165 1186 /* remove a breakpoint */
1166 1187 int cpu_breakpoint_remove(CPUState *env, target_ulong pc)
1167 1188 {
... ...
gdbstub.c
  View file @7d03f82
... ... @@ -962,6 +962,12 @@ static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
962 962 /* TODO: Make this return the correct value for user-mode. */
963 963 snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
964 964 put_packet(s, buf);
  965 + /* Remove all the breakpoints when this query is issued,
  966 + * because gdb is doing and initial connect and the state
  967 + * should be cleaned up.
  968 + */
  969 + cpu_breakpoint_remove_all(env);
  970 + cpu_watchpoint_remove_all(env);
965 971 break;
966 972 case 'c':
967 973 if (*p != '\0') {
... ... @@ -985,6 +991,17 @@ static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
985 991 }
986 992 gdb_continue(s);
987 993 return RS_IDLE;
  994 + case 'k':
  995 + /* Kill the target */
  996 + fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");
  997 + exit(0);
  998 + case 'D':
  999 + /* Detach packet */
  1000 + cpu_breakpoint_remove_all(env);
  1001 + cpu_watchpoint_remove_all(env);
  1002 + gdb_continue(s);
  1003 + put_packet(s, "OK");
  1004 + break;
988 1005 case 's':
989 1006 if (*p != '\0') {
990 1007 addr = strtoull(p, (char **)&p, 16);
... ...