diff options
Diffstat (limited to 'gdb/rs6000-tdep.c')
| -rw-r--r-- | gdb/rs6000-tdep.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c index 43880fa..ce98dc2 100644 --- a/gdb/rs6000-tdep.c +++ b/gdb/rs6000-tdep.c @@ -6247,6 +6247,69 @@ UNKNOWN_OP: return 0; } +/* Used for matching tw, twi, td and tdi instructions for POWER. */ + +static constexpr uint32_t TX_INSN_MASK = 0xFC0007FF; +static constexpr uint32_t TW_INSN = 0x7C000008; +static constexpr uint32_t TD_INSN = 0x7C000088; + +static constexpr uint32_t TXI_INSN_MASK = 0xFC000000; +static constexpr uint32_t TWI_INSN = 0x0C000000; +static constexpr uint32_t TDI_INSN = 0x08000000; + +static inline bool +is_tw_insn (uint32_t insn) +{ + return (insn & TX_INSN_MASK) == TW_INSN; +} + +static inline bool +is_twi_insn (uint32_t insn) +{ + return (insn & TXI_INSN_MASK) == TWI_INSN; +} + +static inline bool +is_td_insn (uint32_t insn) +{ + return (insn & TX_INSN_MASK) == TD_INSN; +} + +static inline bool +is_tdi_insn (uint32_t insn) +{ + return (insn & TXI_INSN_MASK) == TDI_INSN; +} + +/* Implementation of gdbarch_program_breakpoint_here_p for POWER. */ + +static bool +rs6000_program_breakpoint_here_p (gdbarch *gdbarch, CORE_ADDR address) +{ + gdb_byte target_mem[PPC_INSN_SIZE]; + + /* Enable the automatic memory restoration from breakpoints while + we read the memory. Otherwise we may find temporary breakpoints, ones + inserted by GDB, and flag them as permanent breakpoints. */ + scoped_restore restore_memory + = make_scoped_restore_show_memory_breakpoints (0); + + if (target_read_memory (address, target_mem, PPC_INSN_SIZE) == 0) + { + uint32_t insn = (uint32_t) extract_unsigned_integer + (target_mem, PPC_INSN_SIZE, gdbarch_byte_order_for_code (gdbarch)); + + /* Check if INSN is a TW, TWI, TD or TDI instruction. There + are multiple choices of such instructions with different registers + and / or immediate values but they all cause a break. */ + if (is_tw_insn (insn) || is_twi_insn (insn) || is_td_insn (insn) + || is_tdi_insn (insn)) + return true; + } + + return false; +} + /* Initialize the current architecture based on INFO. If possible, re-use an architecture from ARCHES, which is a list of architectures already created during this debugging session. @@ -7109,6 +7172,8 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) rs6000_breakpoint::kind_from_pc); set_gdbarch_sw_breakpoint_from_kind (gdbarch, rs6000_breakpoint::bp_from_kind); + set_gdbarch_program_breakpoint_here_p (gdbarch, + rs6000_program_breakpoint_here_p); /* The value of symbols of type N_SO and N_FUN maybe null when it shouldn't be. */ |