diff options
| -rw-r--r-- | gdb/ChangeLog | 43 | ||||
| -rw-r--r-- | gdb/breakpoint.c | 112 | ||||
| -rw-r--r-- | gdb/eval.c | 79 | ||||
| -rw-r--r-- | gdb/i386-nat.c | 6 | ||||
| -rw-r--r-- | gdb/ia64-linux-nat.c | 6 | ||||
| -rw-r--r-- | gdb/inf-ttrace.c | 6 | ||||
| -rw-r--r-- | gdb/mips-linux-nat.c | 6 | ||||
| -rw-r--r-- | gdb/nto-procfs.c | 6 | ||||
| -rw-r--r-- | gdb/ppc-linux-nat.c | 234 | ||||
| -rw-r--r-- | gdb/procfs.c | 6 | ||||
| -rw-r--r-- | gdb/remote-m32r-sdi.c | 6 | ||||
| -rw-r--r-- | gdb/remote-mips.c | 6 | ||||
| -rw-r--r-- | gdb/remote.c | 6 | ||||
| -rw-r--r-- | gdb/s390-nat.c | 6 | ||||
| -rw-r--r-- | gdb/target.c | 53 | ||||
| -rw-r--r-- | gdb/target.h | 34 | ||||
| -rw-r--r-- | gdb/value.c | 14 | ||||
| -rw-r--r-- | gdb/value.h | 6 |
18 files changed, 503 insertions, 132 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 9408b1c..dd81237 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,46 @@ +2010-07-07 Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com> + Thiago Jung Bauermann <bauerman@br.ibm.com> + + Support for hw accelerated condition watchpoints in booke powerpc. + + * breakpoint.c (fetch_watchpoint_value): Rename to fetch_subexp_value + and move to eval.c. Change callers. + (insert_bp_location): Pass watchpoint condition in + target_insert_watchpoint. + (remove_breakpoint_1) Pass watchpoint condition in + target_remove_watchpoint. + (watchpoint_locations_match): Call + target_can_accel_watchpoint_condition. + * eval.c: Include wrapper.h. + (fetch_subexp_value): Moved from breakpoint.c. + * ppc-linux-nat.c (ppc_linux_region_ok_for_hw_watchpoint): + Formatting fix. + (can_use_watchpoint_cond_accel): New function. + (calculate_dvc): Likewise. + (num_memory_accesses): Likewise. + (check_condition): Likewise. + (ppc_linux_can_accel_watchpoint_condition): Likewise + (ppc_linux_insert_watchpoint): Call can_use_watchpoint_cond_accel, + check_condition and calculate_dvc. + (ppc_linux_remove_watchpoint): Likewise. + (_initialize_ppc_linux_nat): Set to_can_accel_watchpoint_condition to + ppc_linux_can_accel_watchpoint_condition + * target.c (debug_to_insert_watchpoint): Add argument for watchpoint + condition. + (debug_to_remove_watchpoint): Likewise. + (debug_to_can_accel_watchpoint_condition): New function. + (update_current_target): Set to_can_accel_watchpoint_condition. + (setup_target_debug): Set to_can_accel_watchpoint_condition. + * target.h: Add opaque declaration for struct expression. + (struct target_ops) <to_insert_watchpoint>, + <to_remove_watchpoint>: Add new arguments to pass the watchpoint + <to_can_accel_watchpoint_condition>: New member. + condition. Update all callers and implementations. + (target_can_accel_watchpoint_condition): New macro. + * value.c (free_value_chain): New function. + * value.h (fetch_subexp_value): New prototype. + (free_value_chain): Likewise. + 2010-07-07 Ulrich Weigand <uweigand@de.ibm.com> * linux-nat.c (linux_nat_do_thread_registers): Use section size diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c index 3c93c4b..4affe0a 100644 --- a/gdb/breakpoint.c +++ b/gdb/breakpoint.c @@ -1234,84 +1234,6 @@ is_watchpoint (const struct breakpoint *bpt) || bpt->type == bp_watchpoint); } -/* Find the current value of a watchpoint on EXP. Return the value in - *VALP and *RESULTP and the chain of intermediate and final values - in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does - not need them. - - If a memory error occurs while evaluating the expression, *RESULTP will - be set to NULL. *RESULTP may be a lazy value, if the result could - not be read from memory. It is used to determine whether a value - is user-specified (we should watch the whole value) or intermediate - (we should watch only the bit used to locate the final value). - - If the final value, or any intermediate value, could not be read - from memory, *VALP will be set to NULL. *VAL_CHAIN will still be - set to any referenced values. *VALP will never be a lazy value. - This is the value which we store in struct breakpoint. - - If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the - value chain. The caller must free the values individually. If - VAL_CHAIN is NULL, all generated values will be left on the value - chain. */ - -static void -fetch_watchpoint_value (struct expression *exp, struct value **valp, - struct value **resultp, struct value **val_chain) -{ - struct value *mark, *new_mark, *result; - volatile struct gdb_exception ex; - - *valp = NULL; - if (resultp) - *resultp = NULL; - if (val_chain) - *val_chain = NULL; - - /* Evaluate the expression. */ - mark = value_mark (); - result = NULL; - - TRY_CATCH (ex, RETURN_MASK_ALL) - { - result = evaluate_expression (exp); - } - if (ex.reason < 0) - { - /* Ignore memory errors, we want watchpoints pointing at - inaccessible memory to still be created; otherwise, throw the - error to some higher catcher. */ - switch (ex.error) - { - case MEMORY_ERROR: - break; - default: - throw_exception (ex); - break; - } - } - - new_mark = value_mark (); - if (mark == new_mark) - return; - if (resultp) - *resultp = result; - - /* Make sure it's not lazy, so that after the target stops again we - have a non-lazy previous value to compare with. */ - if (result != NULL - && (!value_lazy (result) || gdb_value_fetch_lazy (result))) - *valp = result; - - if (val_chain) - { - /* Return the chain of intermediate values. We use this to - decide which addresses to watch. */ - *val_chain = new_mark; - value_release_to_mark (mark); - } -} - /* Assuming that B is a watchpoint: returns true if the current thread and its running state are safe to evaluate or update watchpoint B. Watchpoints on local expressions need to be evaluated in the @@ -1469,10 +1391,11 @@ update_watchpoint (struct breakpoint *b, int reparse) } else if (within_current_scope && b->exp) { + int pc = 0; struct value *val_chain, *v, *result, *next; struct program_space *frame_pspace; - fetch_watchpoint_value (b->exp, &v, &result, &val_chain); + fetch_subexp_value (b->exp, &pc, &v, &result, &val_chain); /* Avoid setting b->val if it's already set. The meaning of b->val is 'the last value' user saw, and we should update @@ -1828,7 +1751,8 @@ Note: automatically using hardware breakpoints for read-only addresses.\n")); { val = target_insert_watchpoint (bpt->address, bpt->length, - bpt->watchpoint_type); + bpt->watchpoint_type, + bpt->owner->cond_exp); /* If trying to set a read-watchpoint, and it turns out it's not supported, try emulating one with an access watchpoint. */ @@ -1856,7 +1780,8 @@ Note: automatically using hardware breakpoints for read-only addresses.\n")); { val = target_insert_watchpoint (bpt->address, bpt->length, - hw_access); + hw_access, + bpt->owner->cond_exp); if (val == 0) bpt->watchpoint_type = hw_access; } @@ -2525,8 +2450,8 @@ remove_breakpoint_1 (struct bp_location *b, insertion_state_t is) else if (b->loc_type == bp_loc_hardware_watchpoint) { b->inserted = (is == mark_inserted); - val = target_remove_watchpoint (b->address, b->length, - b->watchpoint_type); + val = target_remove_watchpoint (b->address, b->length, + b->watchpoint_type, b->owner->cond_exp); /* Failure to remove any of the hardware watchpoints comes here. */ if ((is == mark_uninserted) && (b->inserted)) @@ -3679,10 +3604,11 @@ watchpoint_check (void *p) call free_all_values. We can't call free_all_values because we might be in the middle of evaluating a function call. */ + int pc = 0; struct value *mark = value_mark (); struct value *new_val; - fetch_watchpoint_value (b->exp, &new_val, NULL, NULL); + fetch_subexp_value (b->exp, &pc, &new_val, NULL, NULL); /* We use value_equal_contents instead of value_equal because the latter coerces an array to a pointer, thus comparing just the address of the @@ -5262,6 +5188,21 @@ watchpoint_locations_match (struct bp_location *loc1, struct bp_location *loc2) gdb_assert (loc1->owner != NULL); gdb_assert (loc2->owner != NULL); + /* If the target can evaluate the condition expression in hardware, then we + we need to insert both watchpoints even if they are at the same place. + Otherwise the watchpoint will only trigger when the condition of whichever + watchpoint was inserted evaluates to true, not giving a chance for GDB to + check the condition of the other watchpoint. */ + if ((loc1->owner->cond_exp + && target_can_accel_watchpoint_condition (loc1->address, loc1->length, + loc1->watchpoint_type, + loc1->owner->cond_exp)) + || (loc2->owner->cond_exp + && target_can_accel_watchpoint_condition (loc2->address, loc2->length, + loc2->watchpoint_type, + loc2->owner->cond_exp))) + return 0; + /* Note that this checks the owner's type, not the location's. In case the target does not support read watchpoints, but does support access watchpoints, we'll have bp_read_watchpoint @@ -8057,6 +7998,7 @@ watch_command_1 (char *arg, int accessflag, int from_tty) enum bptype bp_type; int mem_cnt = 0; int thread = -1; + int pc = 0; /* Make sure that we actually have parameters to parse. */ if (arg != NULL && arg[0] != '\0') @@ -8143,7 +8085,7 @@ watch_command_1 (char *arg, int accessflag, int from_tty) exp_valid_block = innermost_block; mark = value_mark (); - fetch_watchpoint_value (exp, &val, NULL, NULL); + fetch_subexp_value (exp, &pc, &val, NULL, NULL); if (val != NULL) release_value (val); @@ -43,6 +43,7 @@ #include "gdb_obstack.h" #include "objfiles.h" #include "python/python.h" +#include "wrapper.h" #include "gdb_assert.h" @@ -186,6 +187,84 @@ evaluate_subexpression_type (struct expression *exp, int subexp) return evaluate_subexp (NULL_TYPE, exp, &subexp, EVAL_AVOID_SIDE_EFFECTS); } +/* Find the current value of a watchpoint on EXP. Return the value in + *VALP and *RESULTP and the chain of intermediate and final values + in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does + not need them. + + If a memory error occurs while evaluating the expression, *RESULTP will + be set to NULL. *RESULTP may be a lazy value, if the result could + not be read from memory. It is used to determine whether a value + is user-specified (we should watch the whole value) or intermediate + (we should watch only the bit used to locate the final value). + + If the final value, or any intermediate value, could not be read + from memory, *VALP will be set to NULL. *VAL_CHAIN will still be + set to any referenced values. *VALP will never be a lazy value. + This is the value which we store in struct breakpoint. + + If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the + value chain. The caller must free the values individually. If + VAL_CHAIN is NULL, all generated values will be left on the value + chain. */ + +void +fetch_subexp_value (struct expression *exp, int *pc, struct value **valp, + struct value **resultp, struct value **val_chain) +{ + struct value *mark, *new_mark, *result; + volatile struct gdb_exception ex; + + *valp = NULL; + if (resultp) + *resultp = NULL; + if (val_chain) + *val_chain = NULL; + + /* Evaluate the expression. */ + mark = value_mark (); + result = NULL; + + TRY_CATCH (ex, RETURN_MASK_ALL) + { + result = evaluate_subexp (NULL_TYPE, exp, pc, EVAL_NORMAL); + } + if (ex.reason < 0) + { + /* Ignore memory errors, we want watchpoints pointing at + inaccessible memory to still be created; otherwise, throw the + error to some higher catcher. */ + switch (ex.error) + { + case MEMORY_ERROR: + break; + default: + throw_exception (ex); + break; + } + } + + new_mark = value_mark (); + if (mark == new_mark) + return; + if (resultp) + *resultp = result; + + /* Make sure it's not lazy, so that after the target stops again we + have a non-lazy previous value to compare with. */ + if (result != NULL + && (!value_lazy (result) || gdb_value_fetch_lazy (result))) + *valp = result; + + if (val_chain) + { + /* Return the chain of intermediate values. We use this to + decide which addresses to watch. */ + *val_chain = new_mark; + value_release_to_mark (mark); + } +} + /* Extract a field operation from an expression. If the subexpression of EXP starting at *SUBEXP is not a structure dereference operation, return NULL. Otherwise, return the name of the diff --git a/gdb/i386-nat.c b/gdb/i386-nat.c index 82c51d7..eaa3644 100644 --- a/gdb/i386-nat.c +++ b/gdb/i386-nat.c @@ -484,7 +484,8 @@ Invalid value %d of operation in i386_handle_nonaligned_watchpoint.\n"), of the type TYPE. Return 0 on success, -1 on failure. */ static int -i386_insert_watchpoint (CORE_ADDR addr, int len, int type) +i386_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int retval; @@ -511,7 +512,8 @@ i386_insert_watchpoint (CORE_ADDR addr, int len, int type) address ADDR, whose length is LEN bytes, and for accesses of the type TYPE. Return 0 on success, -1 on failure. */ static int -i386_remove_watchpoint (CORE_ADDR addr, int len, int type) +i386_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int retval; diff --git a/gdb/ia64-linux-nat.c b/gdb/ia64-linux-nat.c index e6a7077..d33e88e 100644 --- a/gdb/ia64-linux-nat.c +++ b/gdb/ia64-linux-nat.c @@ -530,7 +530,8 @@ is_power_of_2 (int val) } static int -ia64_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) +ia64_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw, + struct expression *cond) { struct lwp_info *lp; ptid_t ptid; @@ -584,7 +585,8 @@ ia64_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) } static int -ia64_linux_remove_watchpoint (CORE_ADDR addr, int len, int type) +ia64_linux_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int idx; long dbr_addr, dbr_mask; diff --git a/gdb/inf-ttrace.c b/gdb/inf-ttrace.c index 199ceb9..aa0462f 100644 --- a/gdb/inf-ttrace.c +++ b/gdb/inf-ttrace.c @@ -314,7 +314,8 @@ inf_ttrace_disable_page_protections (pid_t pid) type TYPE. */ static int -inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type) +inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { const int pagesize = inf_ttrace_page_dict.pagesize; pid_t pid = ptid_get_pid (inferior_ptid); @@ -337,7 +338,8 @@ inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type) type TYPE. */ static int -inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type) +inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { const int pagesize = inf_ttrace_page_dict.pagesize; pid_t pid = ptid_get_pid (inferior_ptid); diff --git a/gdb/mips-linux-nat.c b/gdb/mips-linux-nat.c index fe05192..e9e7c02 100644 --- a/gdb/mips-linux-nat.c +++ b/gdb/mips-linux-nat.c @@ -926,7 +926,8 @@ populate_regs_from_watches (struct pt_watch_regs *regs) watch. Return zero on success. */ static int -mips_linux_insert_watchpoint (CORE_ADDR addr, int len, int type) +mips_linux_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { struct pt_watch_regs regs; struct mips_watchpoint *new_watch; @@ -975,7 +976,8 @@ mips_linux_insert_watchpoint (CORE_ADDR addr, int len, int type) Return zero on success. */ static int -mips_linux_remove_watchpoint (CORE_ADDR addr, int len, int type) +mips_linux_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int retval; int deleted_one; diff --git a/gdb/nto-procfs.c b/gdb/nto-procfs.c index 2741ecf..a8cd1cd 100644 --- a/gdb/nto-procfs.c +++ b/gdb/nto-procfs.c @@ -1506,13 +1506,15 @@ procfs_can_use_hw_breakpoint (int type, int cnt, int othertype) } static int -procfs_remove_hw_watchpoint (CORE_ADDR addr, int len, int type) +procfs_remove_hw_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { return procfs_hw_watchpoint (addr, -1, type); } static int -procfs_insert_hw_watchpoint (CORE_ADDR addr, int len, int type) +procfs_insert_hw_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { return procfs_hw_watchpoint (addr, len, type); } diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c index f61ac5d..e8d96f6 100644 --- a/gdb/ppc-linux-nat.c +++ b/gdb/ppc-linux-nat.c @@ -1492,7 +1492,7 @@ ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) if (booke_debug_info.data_bp_alignment && (addr + len > (addr & ~(booke_debug_info.data_bp_alignment - 1)) + booke_debug_info.data_bp_alignment)) - return 0; + return 0; } /* addr+len must fall in the 8 byte watchable region for DABR-based processors (i.e., server processors). Without the new BookE ptrace @@ -1685,8 +1685,202 @@ get_trigger_type (int rw) return t; } +/* Check whether we have at least one free DVC register. */ +static int +can_use_watchpoint_cond_accel (void) +{ + struct thread_points *p; + int tid = TIDGET (inferior_ptid); + int cnt = booke_debug_info.num_condition_regs, i; + CORE_ADDR tmp_value; + + if (!have_ptrace_booke_interface () || cnt == 0) + return 0; + + p = booke_find_thread_points_by_tid (tid, 0); + + if (p) + { + for (i = 0; i < max_slots_number; i++) + if (p->hw_breaks[i].hw_break != NULL + && (p->hw_breaks[i].hw_break->condition_mode + != PPC_BREAKPOINT_CONDITION_NONE)) + cnt--; + + /* There are no available slots now. */ + if (cnt <= 0) + return 0; + } + + return 1; +} + +/* Calculate the enable bits and the contents of the Data Value Compare + debug register present in BookE processors. + + ADDR is the address to be watched, LEN is the length of watched data + and DATA_VALUE is the value which will trigger the watchpoint. + On exit, CONDITION_MODE will hold the enable bits for the DVC, and + CONDITION_VALUE will hold the value which should be put in the + DVC register. */ +static void +calculate_dvc (CORE_ADDR addr, int len, CORE_ADDR data_value, + uint32_t *condition_mode, uint64_t *condition_value) +{ + int i, num_byte_enable, align_offset, num_bytes_off_dvc, + rightmost_enabled_byte; + CORE_ADDR addr_end_data, addr_end_dvc; + + /* The DVC register compares bytes within fixed-length windows which + are word-aligned, with length equal to that of the DVC register. + We need to calculate where our watch region is relative to that + window and enable comparison of the bytes which fall within it. */ + + align_offset = addr % booke_debug_info.sizeof_condition; + addr_end_data = addr + len; + addr_end_dvc = (addr - align_offset + + booke_debug_info.sizeof_condition); + num_bytes_off_dvc = (addr_end_data > addr_end_dvc)? + addr_end_data - addr_end_dvc : 0; + num_byte_enable = len - num_bytes_off_dvc; + /* Here, bytes are numbered from right to left. */ + rightmost_enabled_byte = (addr_end_data < addr_end_dvc)? + addr_end_dvc - addr_end_data : 0; + + *condition_mode = PPC_BREAKPOINT_CONDITION_AND; + for (i = 0; i < num_byte_enable; i++) + *condition_mode |= PPC_BREAKPOINT_CONDITION_BE (i + rightmost_enabled_byte); + + /* Now we need to match the position within the DVC of the comparison + value with where the watch region is relative to the window + (i.e., the ALIGN_OFFSET). */ + + *condition_value = ((uint64_t) data_value >> num_bytes_off_dvc * 8 + << rightmost_enabled_byte * 8); +} + +/* Return the number of memory locations that need to be accessed to + evaluate the expression which generated the given value chain. + Returns -1 if there's any register access involved, or if there are + other kinds of values which are not acceptable in a condition + expression (e.g., lval_computed or lval_internalvar). */ +static int +num_memory_accesses (struct value *v) +{ + int found_memory_cnt = 0; + struct value *head = v; + + /* The idea here is that evaluating an expression generates a series + of values, one holding the value of every subexpression. (The + expression a*b+c has five subexpressions: a, b, a*b, c, and + a*b+c.) GDB's values hold almost enough information to establish + the criteria given above --- they identify memory lvalues, + register lvalues, computed values, etcetera. So we can evaluate + the expression, and then scan the chain of values that leaves + behind to determine the memory locations involved in the evaluation + of an expression. + + However, I don't think that the values returned by inferior + function calls are special in any way. So this function may not + notice that an expression contains an inferior function call. + FIXME. */ + + for (; v; v = value_next (v)) + { + /* Constants and values from the history are fine. */ + if (VALUE_LVAL (v) == not_lval || deprecated_value_modifiable (v) == 0) + continue; + else if (VALUE_LVAL (v) == lval_memory) + { + /* A lazy memory lvalue is one that GDB never needed to fetch; + we either just used its address (e.g., `a' in `a.b') or + we never needed it at all (e.g., `a' in `a,b'). */ + if (!value_lazy (v)) + found_memory_cnt++; + } + /* Other kinds of values are not fine. */ + else + return -1; + } + + return found_memory_cnt; +} + +/* Verifies whether the expression COND can be implemented using the + DVC (Data Value Compare) register in BookE processors. The expression + must test the watch value for equality with a constant expression. + If the function returns 1, DATA_VALUE will contain the constant against + which the watch value should be compared. */ +static int +check_condition (CORE_ADDR watch_addr, struct expression *cond, + CORE_ADDR *data_value) +{ + int pc = 1, num_accesses_left, num_accesses_right; + struct value *left_val, *right_val, *left_chain, *right_chain; + + if (cond->elts[0].opcode != BINOP_EQUAL) + return 0; + + fetch_subexp_value (cond, &pc, &left_val, NULL, &left_chain); + num_accesses_left = num_memory_accesses (left_chain); + + if (left_val == NULL || num_accesses_left < 0) + { + free_value_chain (left_chain); + + return 0; + } + + fetch_subexp_value (cond, &pc, &right_val, NULL, &right_chain); + num_accesses_right = num_memory_accesses (right_chain); + + if (right_val == NULL || num_accesses_right < 0) + { + free_value_chain (left_chain); + free_value_chain (right_chain); + + return 0; + } + + if (num_accesses_left == 1 && num_accesses_right == 0 + && VALUE_LVAL (left_val) == lval_memory + && value_address (left_val) == watch_addr) + *data_value = value_as_long (right_val); + else if (num_accesses_left == 0 && num_accesses_right == 1 + && VALUE_LVAL (right_val) == lval_memory + && value_address (right_val) == watch_addr) + *data_value = value_as_long (left_val); + else + { + free_value_chain (left_chain); + free_value_chain (right_chain); + + return 0; + } + + free_value_chain (left_chain); + free_value_chain (right_chain); + + return 1; +} + +/* Return non-zero if the target is capable of using hardware to evaluate + the condition expression, thus only triggering the watchpoint when it is + true. */ +static int +ppc_linux_can_accel_watchpoint_condition (CORE_ADDR addr, int len, int rw, + struct expression *cond) +{ + CORE_ADDR data_value; + + return (have_ptrace_booke_interface () + && booke_debug_info.num_condition_regs > 0 + && check_condition (addr, cond, &data_value)); +} + static int -ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) +ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw, + struct expression *cond) { struct lwp_info *lp; ptid_t ptid; @@ -1695,14 +1889,23 @@ ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) if (have_ptrace_booke_interface ()) { struct ppc_hw_breakpoint p; + CORE_ADDR data_value; + + if (cond && can_use_watchpoint_cond_accel () + && check_condition (addr, cond, &data_value)) + calculate_dvc (addr, len, data_value, &p.condition_mode, + &p.condition_value); + else + { + p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p.condition_value = 0; + } p.version = PPC_DEBUG_CURRENT_VERSION; p.trigger_type = get_trigger_type (rw); p.addr_mode = PPC_BREAKPOINT_MODE_EXACT; - p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; p.addr = (uint64_t) addr; p.addr2 = 0; - p.condition_value = 0; ALL_LWPS (lp, ptid) booke_insert_point (&p, TIDGET (ptid)); @@ -1749,7 +1952,8 @@ ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) saved_dabr_value = dabr_value; ALL_LWPS (lp, ptid) - if (ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, saved_dabr_value) < 0) + if (ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, + saved_dabr_value) < 0) return -1; ret = 0; @@ -1759,7 +1963,8 @@ ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) } static int -ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw) +ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw, + struct expression *cond) { struct lwp_info *lp; ptid_t ptid; @@ -1768,14 +1973,23 @@ ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw) if (have_ptrace_booke_interface ()) { struct ppc_hw_breakpoint p; + CORE_ADDR data_value; + + if (cond && booke_debug_info.num_condition_regs > 0 + && check_condition (addr, cond, &data_value)) + calculate_dvc (addr, len, data_value, &p.condition_mode, + &p.condition_value); + else + { + p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p.condition_value = 0; + } p.version = PPC_DEBUG_CURRENT_VERSION; p.trigger_type = get_trigger_type (rw); p.addr_mode = PPC_BREAKPOINT_MODE_EXACT; - p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; p.addr = (uint64_t) addr; p.addr2 = 0; - p.condition_value = 0; ALL_LWPS (lp, ptid) booke_remove_point (&p, TIDGET (ptid)); @@ -1786,7 +2000,8 @@ ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw) { saved_dabr_value = 0; ALL_LWPS (lp, ptid) - if (ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, saved_dabr_value) < 0) + if (ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, + saved_dabr_value) < 0) return -1; ret = 0; @@ -2137,6 +2352,7 @@ _initialize_ppc_linux_nat (void) t->to_stopped_by_watchpoint = ppc_linux_stopped_by_watchpoint; t->to_stopped_data_address = ppc_linux_stopped_data_address; t->to_watchpoint_addr_within_range = ppc_linux_watchpoint_addr_within_range; + t->to_can_accel_watchpoint_condition = ppc_linux_can_accel_watchpoint_condition; t->to_read_description = ppc_linux_read_description; t->to_auxv_parse = ppc_linux_auxv_parse; diff --git a/gdb/procfs.c b/gdb/procfs.c index 97a87e3..de8e26d 100644 --- a/gdb/procfs.c +++ b/gdb/procfs.c @@ -5161,7 +5161,8 @@ procfs_stopped_data_address (struct target_ops *targ, CORE_ADDR *addr) } static int -procfs_insert_watchpoint (CORE_ADDR addr, int len, int type) +procfs_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { if (!target_have_steppable_watchpoint && !gdbarch_have_nonsteppable_watchpoint (target_gdbarch)) @@ -5182,7 +5183,8 @@ procfs_insert_watchpoint (CORE_ADDR addr, int len, int type) } static int -procfs_remove_watchpoint (CORE_ADDR addr, int len, int type) +procfs_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { return procfs_set_watchpoint (inferior_ptid, addr, 0, 0, 0); } diff --git a/gdb/remote-m32r-sdi.c b/gdb/remote-m32r-sdi.c index ad21774..ca450d5 100644 --- a/gdb/remote-m32r-sdi.c +++ b/gdb/remote-m32r-sdi.c @@ -1421,7 +1421,8 @@ m32r_can_use_hw_watchpoint (int type, int cnt, int othertype) watchpoint. */ static int -m32r_insert_watchpoint (CORE_ADDR addr, int len, int type) +m32r_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int i; @@ -1445,7 +1446,8 @@ m32r_insert_watchpoint (CORE_ADDR addr, int len, int type) } static int -m32r_remove_watchpoint (CORE_ADDR addr, int len, int type) +m32r_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int i; diff --git a/gdb/remote-mips.c b/gdb/remote-mips.c index 28d2ecb..ec2e5eb 100644 --- a/gdb/remote-mips.c +++ b/gdb/remote-mips.c @@ -2401,7 +2401,8 @@ calculate_mask (CORE_ADDR addr, int len) watchpoint. */ int -mips_insert_watchpoint (CORE_ADDR addr, int len, int type) +mips_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { if (mips_set_breakpoint (addr, len, type)) return -1; @@ -2412,7 +2413,8 @@ mips_insert_watchpoint (CORE_ADDR addr, int len, int type) /* Remove a watchpoint. */ int -mips_remove_watchpoint (CORE_ADDR addr, int len, int type) +mips_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { if (mips_clear_breakpoint (addr, len, type)) return -1; diff --git a/gdb/remote.c b/gdb/remote.c index 385d62a..71eee5d 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -7646,7 +7646,8 @@ watchpoint_to_Z_packet (int type) } static int -remote_insert_watchpoint (CORE_ADDR addr, int len, int type) +remote_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { struct remote_state *rs = get_remote_state (); char *p; @@ -7679,7 +7680,8 @@ remote_insert_watchpoint (CORE_ADDR addr, int len, int type) static int -remote_remove_watchpoint (CORE_ADDR addr, int len, int type) +remote_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { struct remote_state *rs = get_remote_state (); char *p; diff --git a/gdb/s390-nat.c b/gdb/s390-nat.c index 3af42ff..b412fda 100644 --- a/gdb/s390-nat.c +++ b/gdb/s390-nat.c @@ -335,7 +335,8 @@ s390_fix_watch_points (ptid_t ptid) } static int -s390_insert_watchpoint (CORE_ADDR addr, int len, int type) +s390_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { struct lwp_info *lp; ptid_t ptid; @@ -356,7 +357,8 @@ s390_insert_watchpoint (CORE_ADDR addr, int len, int type) } static int -s390_remove_watchpoint (CORE_ADDR addr, int len, int type) +s390_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { struct lwp_info *lp; ptid_t ptid; diff --git a/gdb/target.c b/gdb/target.c index 7c9793d..862df4e 100644 --- a/gdb/target.c +++ b/gdb/target.c @@ -117,9 +117,11 @@ static int debug_to_insert_hw_breakpoint (struct gdbarch *, static int debug_to_remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *); -static int debug_to_insert_watchpoint (CORE_ADDR, int, int); +static int debug_to_insert_watchpoint (CORE_ADDR, int, int, + struct expression *); -static int debug_to_remove_watchpoint (CORE_ADDR, int, int); +static int debug_to_remove_watchpoint (CORE_ADDR, int, int, + struct expression *); static int debug_to_stopped_by_watchpoint (void); @@ -130,6 +132,9 @@ static int debug_to_watchpoint_addr_within_range (struct target_ops *, static int debug_to_region_ok_for_hw_watchpoint (CORE_ADDR, int); +static int debug_to_can_accel_watchpoint_condition (CORE_ADDR, int, int, + struct expression *); + static void debug_to_terminal_init (void); static void debug_to_terminal_inferior (void); @@ -607,6 +612,7 @@ update_current_target (void) INHERIT (to_stopped_by_watchpoint, t); INHERIT (to_watchpoint_addr_within_range, t); INHERIT (to_region_ok_for_hw_watchpoint, t); + INHERIT (to_can_accel_watchpoint_condition, t); INHERIT (to_terminal_init, t); INHERIT (to_terminal_inferior, t); INHERIT (to_terminal_ours_for_output, t); @@ -728,10 +734,10 @@ update_current_target (void) (int (*) (struct gdbarch *, struct bp_target_info *)) return_minus_one); de_fault (to_insert_watchpoint, - (int (*) (CORE_ADDR, int, int)) + (int (*) (CORE_ADDR, int, int, struct expression *)) return_minus_one); de_fault (to_remove_watchpoint, - (int (*) (CORE_ADDR, int, int)) + (int (*) (CORE_ADDR, int, int, struct expression *)) return_minus_one); de_fault (to_stopped_by_watchpoint, (int (*) (void)) @@ -743,6 +749,9 @@ update_current_target (void) default_watchpoint_addr_within_range); de_fault (to_region_ok_for_hw_watchpoint, default_region_ok_for_hw_watchpoint); + de_fault (to_can_accel_watchpoint_condition, + (int (*) (CORE_ADDR, int, int, struct expression *)) + return_zero); de_fault (to_terminal_init, (void (*) (void)) target_ignore); @@ -3314,6 +3323,21 @@ debug_to_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) } static int +debug_to_can_accel_watchpoint_condition (CORE_ADDR addr, int len, int rw, + struct expression *cond) +{ + int retval; + + retval = debug_target.to_can_accel_watchpoint_condition (addr, len, rw, cond); + + fprintf_unfiltered (gdb_stdlog, + "target_can_accel_watchpoint_condition (0x%lx, %d, %d, 0x%lx) = %ld\n", + (unsigned long) addr, len, rw, (unsigned long) cond, + (unsigned long) retval); + return retval; +} + +static int debug_to_stopped_by_watchpoint (void) { int retval; @@ -3388,28 +3412,32 @@ debug_to_remove_hw_breakpoint (struct gdbarch *gdbarch, } static int -debug_to_insert_watchpoint (CORE_ADDR addr, int len, int type) +debug_to_insert_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int retval; - retval = debug_target.to_insert_watchpoint (addr, len, type); + retval = debug_target.to_insert_watchpoint (addr, len, type, cond); fprintf_unfiltered (gdb_stdlog, - "target_insert_watchpoint (0x%lx, %d, %d) = %ld\n", - (unsigned long) addr, len, type, (unsigned long) retval); + "target_insert_watchpoint (0x%lx, %d, %d, 0x%ld) = %ld\n", + (unsigned long) addr, len, type, (unsigned long) cond, + (unsigned long) retval); return retval; } static int -debug_to_remove_watchpoint (CORE_ADDR addr, int len, int type) +debug_to_remove_watchpoint (CORE_ADDR addr, int len, int type, + struct expression *cond) { int retval; - retval = debug_target.to_remove_watchpoint (addr, len, type); + retval = debug_target.to_remove_watchpoint (addr, len, type, cond); fprintf_unfiltered (gdb_stdlog, - "target_remove_watchpoint (0x%lx, %d, %d) = %ld\n", - (unsigned long) addr, len, type, (unsigned long) retval); + "target_remove_watchpoint (0x%lx, %d, %d, 0x%ld) = %ld\n", + (unsigned long) addr, len, type, (unsigned long) cond, + (unsigned long) retval); return retval; } @@ -3664,6 +3692,7 @@ setup_target_debug (void) current_target.to_stopped_data_address = debug_to_stopped_data_address; current_target.to_watchpoint_addr_within_range = debug_to_watchpoint_addr_within_range; current_target.to_region_ok_for_hw_watchpoint = debug_to_region_ok_for_hw_watchpoint; + current_target.to_can_accel_watchpoint_condition = debug_to_can_accel_watchpoint_condition; current_target.to_terminal_init = debug_to_terminal_init; current_target.to_terminal_inferior = debug_to_terminal_inferior; current_target.to_terminal_ours_for_output = debug_to_terminal_ours_for_output; diff --git a/gdb/target.h b/gdb/target.h index 3c8a616..3c8c017 100644 --- a/gdb/target.h +++ b/gdb/target.h @@ -37,6 +37,8 @@ struct uploaded_tsv; struct uploaded_tp; struct static_tracepoint_marker; +struct expression; + /* This include file defines the interface between the main part of the debugger, and the part which is target-specific, or specific to the communications interface between us and the @@ -426,8 +428,12 @@ struct target_ops int (*to_can_use_hw_breakpoint) (int, int, int); int (*to_insert_hw_breakpoint) (struct gdbarch *, struct bp_target_info *); int (*to_remove_hw_breakpoint) (struct gdbarch *, struct bp_target_info *); - int (*to_remove_watchpoint) (CORE_ADDR, int, int); - int (*to_insert_watchpoint) (CORE_ADDR, int, int); + + /* Documentation of what the two routines below are expected to do is + provided with the corresponding target_* macros. */ + int (*to_remove_watchpoint) (CORE_ADDR, int, int, struct expression *); + int (*to_insert_watchpoint) (CORE_ADDR, int, int, struct expression *); + int (*to_stopped_by_watchpoint) (void); int to_have_steppable_watchpoint; int to_have_continuable_watchpoint; @@ -435,6 +441,8 @@ struct target_ops int (*to_watchpoint_addr_within_range) (struct target_ops *, CORE_ADDR, CORE_ADDR, int); int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int); + int (*to_can_accel_watchpoint_condition) (CORE_ADDR, int, int, + struct expression *); void (*to_terminal_init) (void); void (*to_terminal_inferior) (void); void (*to_terminal_ours_for_output) (void); @@ -1298,14 +1306,15 @@ extern char *normal_pid_to_str (ptid_t ptid); /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes. TYPE is 0 for write, 1 for read, and 2 for read/write accesses. + COND is the expression for its condition, or NULL if there's none. Returns 0 for success, 1 if the watchpoint type is not supported, -1 for failure. */ -#define target_insert_watchpoint(addr, len, type) \ - (*current_target.to_insert_watchpoint) (addr, len, type) +#define target_insert_watchpoint(addr, len, type, cond) \ + (*current_target.to_insert_watchpoint) (addr, len, type, cond) -#define target_remove_watchpoint(addr, len, type) \ - (*current_target.to_remove_watchpoint) (addr, len, type) +#define target_remove_watchpoint(addr, len, type, cond) \ + (*current_target.to_remove_watchpoint) (addr, len, type, cond) #define target_insert_hw_breakpoint(gdbarch, bp_tgt) \ (*current_target.to_insert_hw_breakpoint) (gdbarch, bp_tgt) @@ -1322,6 +1331,19 @@ extern char *normal_pid_to_str (ptid_t ptid); #define target_watchpoint_addr_within_range(target, addr, start, length) \ (*target.to_watchpoint_addr_within_range) (target, addr, start, length) +/* Return non-zero if the target is capable of using hardware to evaluate + the condition expression. In this case, if the condition is false when + the watched memory location changes, execution may continue without the + debugger being notified. + + Due to limitations in the hardware implementation, it may be capable of + avoiding triggering the watchpoint in some cases where the condition + expression is false, but may report some false positives as well. + For this reason, GDB will still evaluate the condition expression when + the watchpoint triggers. */ +#define target_can_accel_watchpoint_condition(addr, len, type, cond) \ + (*current_target.to_can_accel_watchpoint_condition) (addr, len, type, cond) + /* Target can execute in reverse? */ #define target_can_execute_reverse \ (current_target.to_can_execute_reverse ? \ diff --git a/gdb/value.c b/gdb/value.c index edcd4d0..d552402 100644 --- a/gdb/value.c +++ b/gdb/value.c @@ -722,6 +722,20 @@ free_all_values (void) all_values = 0; } +/* Frees all the elements in a chain of values. */ + +void +free_value_chain (struct value *v) +{ + struct value *next; + + for (; v; v = next) + { + next = value_next (v); + value_free (v); + } +} + /* Remove VAL from the chain all_values so it will not be freed automatically. */ diff --git a/gdb/value.h b/gdb/value.h index 0634bb9..12cbc0a 100644 --- a/gdb/value.h +++ b/gdb/value.h @@ -538,6 +538,10 @@ extern struct value *evaluate_subexp (struct type *expect_type, extern struct value *evaluate_subexpression_type (struct expression *exp, int subexp); +extern void fetch_subexp_value (struct expression *exp, int *pc, + struct value **valp, struct value **resultp, + struct value **val_chain); + extern char *extract_field_op (struct expression *exp, int *subexp); extern struct value *evaluate_subexp_with_coercion (struct expression *, @@ -635,6 +639,8 @@ extern void value_free (struct value *val); extern void free_all_values (void); +extern void free_value_chain (struct value *v); + extern void release_value (struct value *val); extern int record_latest_value (struct value *val); |