diff options
Diffstat (limited to 'gdb/config/pa/tm-hppao.h')
| -rw-r--r-- | gdb/config/pa/tm-hppao.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/gdb/config/pa/tm-hppao.h b/gdb/config/pa/tm-hppao.h index aab7274..7df4247 100644 --- a/gdb/config/pa/tm-hppao.h +++ b/gdb/config/pa/tm-hppao.h @@ -69,5 +69,28 @@ /* OSF1 does not need the pc space queue restored. */ #define NO_PC_SPACE_QUEUE_RESTORE +/* The mach kernel uses the recovery counter to implement single + stepping. While this greatly simplifies the kernel support + necessary for single stepping, it unfortunately does the wrong + thing in the presense of a nullified instruction (gives control + back two insns after the nullifed insn). This is an artifact + of the HP architecture (recovery counter doesn't tick for + nullified insns). + + Do our best to avoid losing in such situations. */ +#define INSTRUCTION_NULLIFIED \ +(({ \ + int ipsw = (int)read_register(IPSW_REGNUM); \ + if (ipsw & PSW_N) \ + { \ + int pcoqt = (int)read_register(PCOQ_TAIL_REGNUM); \ + write_register(PCOQ_HEAD_REGNUM, pcoqt); \ + write_register(PCOQ_TAIL_REGNUM, pcoqt + 0x4); \ + write_register(IPSW_REGNUM, ipsw & ~(PSW_N | PSW_B | PSW_X)); \ + stop_pc = pcoqt; \ + } \ + }), 0) + /* It's mostly just the common stuff. */ + #include "pa/tm-hppa.h" |