diff options
Diffstat (limited to 'gdb/tracepoint.c')
| -rw-r--r-- | gdb/tracepoint.c | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c index 1b41806..0fb0e93 100644 --- a/gdb/tracepoint.c +++ b/gdb/tracepoint.c @@ -3671,7 +3671,7 @@ tfile_fetch_registers (struct target_ops *ops, { struct gdbarch *gdbarch = get_regcache_arch (regcache); char block_type; - int i, pos, offset, regn, regsize, gotten; + int i, pos, offset, regn, regsize, gotten, pc_regno; unsigned short mlen; char *regs; @@ -3746,6 +3746,44 @@ tfile_fetch_registers (struct target_ops *ops, break; } } + + /* We get here if no register data has been found. Although we + don't like making up numbers, GDB has all manner of troubles when + the target says some register is not available. Filling in with + zeroes is a reasonable fallback. */ + for (regn = 0; regn < gdbarch_num_regs (gdbarch); regn++) + regcache_raw_supply (regcache, regn, NULL); + + /* We can often usefully guess that the PC is going to be the same + as the address of the tracepoint. */ + pc_regno = gdbarch_pc_regnum (gdbarch); + if (pc_regno >= 0 && (regno == -1 || regno == pc_regno)) + { + struct breakpoint *tp = get_tracepoint (tracepoint_number); + + if (tp && tp->loc) + { + /* But don't try to guess if tracepoint is multi-location... */ + if (tp->loc->next) + { + warning ("Tracepoint %d has multiple locations, cannot infer $pc", + tp->number); + return; + } + /* ... or does while-stepping. */ + if (tp->step_count > 0) + { + warning ("Tracepoint %d does while-stepping, cannot infer $pc", + tp->number); + return; + } + + store_unsigned_integer (regs, register_size (gdbarch, pc_regno), + gdbarch_byte_order (gdbarch), + tp->loc->address); + regcache_raw_supply (regcache, pc_regno, regs); + } + } } static LONGEST |