From: Maciej W. Rozycki Date: Fri, 3 Oct 2014 11:44:58 +0000 (+0100) Subject: Avoid software breakpoint's instruction shadow inconsistency X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0d5ed1535229b7069757e04766f70a02fa60821c;p=binutils-gdb.git Avoid software breakpoint's instruction shadow inconsistency This change: commit b775012e845380ed4c7421a1b87caf7bfae39f5f Author: Luis Machado Date: Fri Feb 24 15:10:59 2012 +0000 2012-02-24 Luis Machado * remote.c (remote_supports_cond_breakpoints): New forward declaration. [...] changed the way breakpoints are inserted and removed such that `insert_bp_location' can now be called with the breakpoint being handled already in place, while previously the call was only ever made for breakpoints that have not been put in place. This in turn caused an issue for software breakpoints and targets for which a breakpoint's `placed_address' may not be the same as the original requested address. The issue is `insert_bp_location' overwrites the previously adjusted value in `placed_address' with the original address, that is only replaced back with the correct adjusted address later on when `gdbarch_breakpoint_from_pc' is called. Meanwhile there's a window where the value in `placed_address' does not correspond to data stored in `shadow_contents', leading to incorrect instruction bytes being supplied when `one_breakpoint_xfer_memory' is called to supply the instruction overlaid by the breakpoint. And this is exactly what happens on the MIPS target with software breakpoints placed in microMIPS code. In this case not only `placed_address' is not the original address because of the ISA bit, but `mips_breakpoint_from_pc' has to read the original instruction to determine which one of the two software breakpoint instruction encodings to choose as well. The 16-bit encoding is used to replace 16-bit instructions and similarly the 32-bit one is used with 32-bit instructions, to satisfy branch delay slot size requirements. The mismatch between `placed_address' and the address data in `shadow_contents' has been obtained from leads to the wrong encoding being used in some cases, which in the case of a 32-bit software breakpoint instruction replacing a 16-bit instruction causes corruption to the adjacent following instruction and leads the debug session astray if execution reaches there e.g. with a jump. To address this problem I made the change below, that adds a `reqstd_address' field to `struct bp_target_info' and leaves `placed_address' unchanged once it has been set. This ensures data in `shadow_contents' is always consistent with `placed_address'. This approach also has this good side effect that all the places that examine the breakpoint's address see a consistent value, either `reqstd_address' or `placed_address', as required. Currently some places see either the original or the adjusted address in `placed_address', depending on whether they have been called before `gdbarch_remote_breakpoint_from_pc' or afterwards. This is in particular true for subsequent calls to `gdbarch_remote_breakpoint_from_pc' itself, e.g. from `one_breakpoint_xfer_memory'. This is also important for places like `find_single_step_breakpoint' where a breakpoint's address is compared to the raw value of $pc. * breakpoint.h (bp_target_info): Add `reqstd_address' member, update comments. * breakpoint.c (one_breakpoint_xfer_memory): Use `reqstd_address' for the breakpoint's address. Don't preinitialize `placed_size'. (insert_bp_location): Set `reqstd_address' rather than `placed_address'. (bp_target_info_copy_insertion_state): Also copy `placed_address'. (bkpt_insert_location): Use `reqstd_address' for the breakpoint's address. (bkpt_remove_location): Likewise. (deprecated_insert_raw_breakpoint): Likewise. (deprecated_remove_raw_breakpoint): Likewise. (find_single_step_breakpoint): Likewise. * mem-break.c (default_memory_insert_breakpoint): Use `reqstd_address' for the breakpoint's address. Don't set `placed_address' or `placed_size' if breakpoint contents couldn't have been determined. * remote.c (remote_insert_breakpoint): Use `reqstd_address' for the breakpoint's address. (remote_insert_hw_breakpoint): Likewise. Don't set `placed_address' or `placed_size' if breakpoint couldn't have been set. * aarch64-linux-nat.c (aarch64_linux_insert_hw_breakpoint): Use `reqstd_address' for the breakpoint's address. * arm-linux-nat.c (arm_linux_hw_breakpoint_initialize): Likewise. * ia64-tdep.c (ia64_memory_insert_breakpoint): Likewise. * m32r-tdep.c (m32r_memory_insert_breakpoint): Likewise. * microblaze-linux-tdep.c (microblaze_linux_memory_remove_breakpoint): Likewise. * monitor.c (monitor_insert_breakpoint): Likewise. * nto-procfs.c (procfs_insert_breakpoint): Likewise. (procfs_insert_hw_breakpoint): Likewise. * ppc-linux-nat.c (ppc_linux_insert_hw_breakpoint): Likewise. * ppc-linux-tdep.c (ppc_linux_memory_remove_breakpoint): Likewise. * remote-m32r-sdi.c (m32r_insert_breakpoint): Likewise. * remote-mips.c (mips_insert_breakpoint): Likewise. * x86-nat.c (x86_insert_hw_breakpoint): Likewise. --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index e4004fe4a64..757cc690f22 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,43 @@ +2014-10-03 Maciej W. Rozycki + + * breakpoint.h (bp_target_info): Add `reqstd_address' member, + update comments. + * breakpoint.c (one_breakpoint_xfer_memory): Use `reqstd_address' + for the breakpoint's address. Don't preinitialize `placed_size'. + (insert_bp_location): Set `reqstd_address' rather than + `placed_address'. + (bp_target_info_copy_insertion_state): Also copy `placed_address'. + (bkpt_insert_location): Use `reqstd_address' for the breakpoint's + address. + (bkpt_remove_location): Likewise. + (deprecated_insert_raw_breakpoint): Likewise. + (deprecated_remove_raw_breakpoint): Likewise. + (find_single_step_breakpoint): Likewise. + * mem-break.c (default_memory_insert_breakpoint): Use + `reqstd_address' for the breakpoint's address. Don't set + `placed_address' or `placed_size' if breakpoint contents couldn't + have been determined. + * remote.c (remote_insert_breakpoint): Use `reqstd_address' for + the breakpoint's address. + (remote_insert_hw_breakpoint): Likewise. Don't set + `placed_address' or `placed_size' if breakpoint couldn't have been + set. + * aarch64-linux-nat.c (aarch64_linux_insert_hw_breakpoint): Use + `reqstd_address' for the breakpoint's address. + * arm-linux-nat.c (arm_linux_hw_breakpoint_initialize): Likewise. + * ia64-tdep.c (ia64_memory_insert_breakpoint): Likewise. + * m32r-tdep.c (m32r_memory_insert_breakpoint): Likewise. + * microblaze-linux-tdep.c + (microblaze_linux_memory_remove_breakpoint): Likewise. + * monitor.c (monitor_insert_breakpoint): Likewise. + * nto-procfs.c (procfs_insert_breakpoint): Likewise. + (procfs_insert_hw_breakpoint): Likewise. + * ppc-linux-nat.c (ppc_linux_insert_hw_breakpoint): Likewise. + * ppc-linux-tdep.c (ppc_linux_memory_remove_breakpoint): Likewise. + * remote-m32r-sdi.c (m32r_insert_breakpoint): Likewise. + * remote-mips.c (mips_insert_breakpoint): Likewise. + * x86-nat.c (x86_insert_hw_breakpoint): Likewise. + 2014-10-03 Luis Machado * valops.c (value_assign): Check for bit field assignments diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c index 1c1832f0b6f..48a6378dcc5 100644 --- a/gdb/aarch64-linux-nat.c +++ b/gdb/aarch64-linux-nat.c @@ -1183,7 +1183,7 @@ aarch64_handle_breakpoint (int type, CORE_ADDR addr, int len, int is_insert) return aarch64_dr_state_remove_one_point (state, type, addr, len); } -/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address. +/* Insert a hardware-assisted breakpoint at BP_TGT->reqstd_address. Return 0 on success, -1 on failure. */ static int @@ -1192,7 +1192,7 @@ aarch64_linux_insert_hw_breakpoint (struct target_ops *self, struct bp_target_info *bp_tgt) { int ret; - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; const int len = 4; const int type = hw_execute; diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c index 96c67a87dd0..b9b99966bb4 100644 --- a/gdb/arm-linux-nat.c +++ b/gdb/arm-linux-nat.c @@ -975,7 +975,7 @@ arm_linux_hw_breakpoint_initialize (struct gdbarch *gdbarch, struct arm_linux_hw_breakpoint *p) { unsigned mask; - CORE_ADDR address = bp_tgt->placed_address; + CORE_ADDR address = bp_tgt->placed_address = bp_tgt->reqstd_address; /* We have to create a mask for the control register which says which bits of the word pointed to by address to break on. */ diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c index 7da88b0a498..e2170b4e803 100644 --- a/gdb/breakpoint.c +++ b/gdb/breakpoint.c @@ -1544,8 +1544,8 @@ one_breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf, else { const unsigned char *bp; - CORE_ADDR placed_address = target_info->placed_address; - int placed_size = target_info->placed_size; + CORE_ADDR addr = target_info->reqstd_address; + int placed_size; /* Update the shadow with what we want to write to memory. */ memcpy (target_info->shadow_contents + bptoffset, @@ -1553,7 +1553,7 @@ one_breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf, /* Determine appropriate breakpoint contents and size for this address. */ - bp = gdbarch_breakpoint_from_pc (gdbarch, &placed_address, &placed_size); + bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &placed_size); /* Update the final write buffer with this inserted breakpoint's INSN. */ @@ -2601,7 +2601,7 @@ insert_bp_location (struct bp_location *bl, we have a breakpoint inserted at that address and thus read the breakpoint instead of returning the data saved in the breakpoint location's shadow contents. */ - bl->target_info.placed_address = bl->address; + bl->target_info.reqstd_address = bl->address; bl->target_info.placed_address_space = bl->pspace->aspace; bl->target_info.length = bl->length; @@ -2642,7 +2642,7 @@ insert_bp_location (struct bp_location *bl, program, but it's not going to work anyway with current gdb. */ struct mem_region *mr - = lookup_mem_region (bl->target_info.placed_address); + = lookup_mem_region (bl->target_info.reqstd_address); if (mr) { @@ -2722,7 +2722,7 @@ insert_bp_location (struct bp_location *bl, bl->section); /* Set a software (trap) breakpoint at the LMA. */ bl->overlay_target_info = bl->target_info; - bl->overlay_target_info.placed_address = addr; + bl->overlay_target_info.reqstd_address = addr; /* No overlay handling: just set the breakpoint. */ TRY_CATCH (e, RETURN_MASK_ALL) @@ -13301,6 +13301,7 @@ bp_target_info_copy_insertion_state (struct bp_target_info *dest, { dest->shadow_len = src->shadow_len; memcpy (dest->shadow_contents, src->shadow_contents, src->shadow_len); + dest->placed_address = src->placed_address; dest->placed_size = src->placed_size; } @@ -13319,7 +13320,7 @@ bkpt_insert_location (struct bp_location *bl) /* There is no need to insert a breakpoint if an unconditional raw/sss breakpoint is already inserted at that location. */ sss_slot = find_single_step_breakpoint (bp_tgt->placed_address_space, - bp_tgt->placed_address); + bp_tgt->reqstd_address); if (sss_slot >= 0) { struct bp_target_info *sss_bp_tgt = single_step_breakpoints[sss_slot]; @@ -13341,7 +13342,7 @@ bkpt_remove_location (struct bp_location *bl) { struct bp_target_info *bp_tgt = &bl->target_info; struct address_space *aspace = bp_tgt->placed_address_space; - CORE_ADDR address = bp_tgt->placed_address; + CORE_ADDR address = bp_tgt->reqstd_address; /* Only remove the breakpoint if there is no raw/sss breakpoint still inserted at this location. Otherwise, we would be @@ -15364,7 +15365,7 @@ deprecated_insert_raw_breakpoint (struct gdbarch *gdbarch, bp_tgt = XCNEW (struct bp_target_info); bp_tgt->placed_address_space = aspace; - bp_tgt->placed_address = pc; + bp_tgt->reqstd_address = pc; /* If an unconditional non-raw breakpoint is already inserted at that location, there's no need to insert another. However, with @@ -15401,7 +15402,7 @@ deprecated_remove_raw_breakpoint (struct gdbarch *gdbarch, void *bp) { struct bp_target_info *bp_tgt = bp; struct address_space *aspace = bp_tgt->placed_address_space; - CORE_ADDR address = bp_tgt->placed_address; + CORE_ADDR address = bp_tgt->reqstd_address; struct bp_location *bl; int ret; @@ -15543,7 +15544,7 @@ find_single_step_breakpoint (struct address_space *aspace, struct bp_target_info *bp_tgt = single_step_breakpoints[i]; if (bp_tgt && breakpoint_address_match (bp_tgt->placed_address_space, - bp_tgt->placed_address, + bp_tgt->reqstd_address, aspace, pc)) return i; } diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h index d65405f8559..b611057a15d 100644 --- a/gdb/breakpoint.h +++ b/gdb/breakpoint.h @@ -235,13 +235,16 @@ struct bp_target_info /* Address space at which the breakpoint was placed. */ struct address_space *placed_address_space; - /* Address at which the breakpoint was placed. This is normally the - same as ADDRESS from the bp_location, except when adjustment - happens in gdbarch_breakpoint_from_pc. The most common form of - adjustment is stripping an alternate ISA marker from the PC which - is used to determine the type of breakpoint to insert. */ + /* Address at which the breakpoint was placed. This is normally + the same as REQUESTED_ADDRESS, except when adjustment happens in + gdbarch_breakpoint_from_pc. The most common form of adjustment + is stripping an alternate ISA marker from the PC which is used + to determine the type of breakpoint to insert. */ CORE_ADDR placed_address; + /* Address at which the breakpoint was requested. */ + CORE_ADDR reqstd_address; + /* If this is a ranged breakpoint, then this field contains the length of the range that will be watched for execution. */ int length; diff --git a/gdb/ia64-tdep.c b/gdb/ia64-tdep.c index 776a8beebcd..85f2b9af25d 100644 --- a/gdb/ia64-tdep.c +++ b/gdb/ia64-tdep.c @@ -637,7 +637,7 @@ static int ia64_memory_insert_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; gdb_byte bundle[BUNDLE_LEN]; int slotnum = (int) (addr & 0x0f) / SLOT_MULTIPLIER, shadow_slotnum; long long instr_breakpoint; diff --git a/gdb/m32r-tdep.c b/gdb/m32r-tdep.c index 067ff99c746..5b6af4b8e8b 100644 --- a/gdb/m32r-tdep.c +++ b/gdb/m32r-tdep.c @@ -79,7 +79,7 @@ static int m32r_memory_insert_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; int val; gdb_byte buf[4]; gdb_byte contents_cache[4]; diff --git a/gdb/mem-break.c b/gdb/mem-break.c index 095b81f1370..f772f56b0c1 100644 --- a/gdb/mem-break.c +++ b/gdb/mem-break.c @@ -37,27 +37,29 @@ int default_memory_insert_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - int val; + CORE_ADDR addr = bp_tgt->reqstd_address; const unsigned char *bp; gdb_byte *readbuf; + int bplen; + int val; /* Determine appropriate breakpoint contents and size for this address. */ - bp = gdbarch_breakpoint_from_pc - (gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size); + bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); if (bp == NULL) error (_("Software breakpoints not implemented for this target.")); + bp_tgt->placed_address = addr; + bp_tgt->placed_size = bplen; + /* Save the memory contents in the shadow_contents buffer and then write the breakpoint instruction. */ - bp_tgt->shadow_len = bp_tgt->placed_size; - readbuf = alloca (bp_tgt->placed_size); - val = target_read_memory (bp_tgt->placed_address, readbuf, - bp_tgt->placed_size); + bp_tgt->shadow_len = bplen; + readbuf = alloca (bplen); + val = target_read_memory (addr, readbuf, bplen); if (val == 0) { - memcpy (bp_tgt->shadow_contents, readbuf, bp_tgt->placed_size); - val = target_write_raw_memory (bp_tgt->placed_address, bp, - bp_tgt->placed_size); + memcpy (bp_tgt->shadow_contents, readbuf, bplen); + val = target_write_raw_memory (addr, bp, bplen); } return val; diff --git a/gdb/microblaze-linux-tdep.c b/gdb/microblaze-linux-tdep.c index 8d360eb7e40..d5334cb5270 100644 --- a/gdb/microblaze-linux-tdep.c +++ b/gdb/microblaze-linux-tdep.c @@ -41,7 +41,7 @@ static int microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->reqstd_address; const gdb_byte *bp; int val; int bplen; diff --git a/gdb/monitor.c b/gdb/monitor.c index b880ff2ead9..f7e331b73cc 100644 --- a/gdb/monitor.c +++ b/gdb/monitor.c @@ -2103,7 +2103,7 @@ static int monitor_insert_breakpoint (struct target_ops *ops, struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; int i; int bplen; diff --git a/gdb/nto-procfs.c b/gdb/nto-procfs.c index 7903210d12f..7a96cc9d9ea 100644 --- a/gdb/nto-procfs.c +++ b/gdb/nto-procfs.c @@ -928,6 +928,7 @@ static int procfs_insert_breakpoint (struct target_ops *ops, struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { + bp_tgt->placed_address = bp_tgt->reqstd_address; return procfs_breakpoint (bp_tgt->placed_address, _DEBUG_BREAK_EXEC, 0); } @@ -942,6 +943,7 @@ static int procfs_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { + bp_tgt->placed_address = bp_tgt->reqstd_address; return procfs_breakpoint (bp_tgt->placed_address, _DEBUG_BREAK_EXEC | _DEBUG_BREAK_HW, 0); } diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c index 0d0393615a1..496c4e7a91d 100644 --- a/gdb/ppc-linux-nat.c +++ b/gdb/ppc-linux-nat.c @@ -1690,7 +1690,7 @@ ppc_linux_insert_hw_breakpoint (struct target_ops *self, p.version = PPC_DEBUG_CURRENT_VERSION; p.trigger_type = PPC_BREAKPOINT_TRIGGER_EXECUTE; p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; - p.addr = (uint64_t) bp_tgt->placed_address; + p.addr = (uint64_t) (bp_tgt->placed_address = bp_tgt->reqstd_address); p.condition_value = 0; if (bp_tgt->length) diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c index 4d7d051d0c5..d232f7f3790 100644 --- a/gdb/ppc-linux-tdep.c +++ b/gdb/ppc-linux-tdep.c @@ -211,7 +211,7 @@ static int ppc_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->reqstd_address; const unsigned char *bp; int val; int bplen; diff --git a/gdb/remote-m32r-sdi.c b/gdb/remote-m32r-sdi.c index 3d6b0c679fd..d1d07c2d64d 100644 --- a/gdb/remote-m32r-sdi.c +++ b/gdb/remote-m32r-sdi.c @@ -1172,7 +1172,7 @@ m32r_insert_breakpoint (struct target_ops *ops, struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; int ib_breakpoints; unsigned char buf[13]; int i, c; diff --git a/gdb/remote-mips.c b/gdb/remote-mips.c index 19ac30f978a..9e4039d9193 100644 --- a/gdb/remote-mips.c +++ b/gdb/remote-mips.c @@ -2375,8 +2375,11 @@ mips_insert_breakpoint (struct target_ops *ops, struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { if (monitor_supports_breakpoints) - return mips_set_breakpoint (bp_tgt->placed_address, MIPS_INSN32_SIZE, - BREAK_FETCH); + { + bp_tgt->placed_address = bp_tgt->reqstd_address; + return mips_set_breakpoint (bp_tgt->placed_address, MIPS_INSN32_SIZE, + BREAK_FETCH); + } else return memory_insert_breakpoint (ops, gdbarch, bp_tgt); } diff --git a/gdb/remote.c b/gdb/remote.c index 41ea0129e33..3d55e41d9fc 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -8076,7 +8076,7 @@ remote_insert_breakpoint (struct target_ops *ops, if (packet_support (PACKET_Z0) != PACKET_DISABLE) { - CORE_ADDR addr = bp_tgt->placed_address; + CORE_ADDR addr = bp_tgt->reqstd_address; struct remote_state *rs; char *p, *endbuf; int bpsize; @@ -8348,16 +8348,16 @@ static int remote_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) { - CORE_ADDR addr; + CORE_ADDR addr = bp_tgt->reqstd_address; struct remote_state *rs; char *p, *endbuf; char *message; + int bpsize; /* The length field should be set to the size of a breakpoint instruction, even though we aren't inserting one ourselves. */ - gdbarch_remote_breakpoint_from_pc - (gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size); + gdbarch_remote_breakpoint_from_pc (gdbarch, &addr, &bpsize); if (packet_support (PACKET_Z1) == PACKET_DISABLE) return -1; @@ -8375,9 +8375,9 @@ remote_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch, *(p++) = '1'; *(p++) = ','; - addr = remote_address_masked (bp_tgt->placed_address); + addr = remote_address_masked (addr); p += hexnumstr (p, (ULONGEST) addr); - xsnprintf (p, endbuf - p, ",%x", bp_tgt->placed_size); + xsnprintf (p, endbuf - p, ",%x", bpsize); if (remote_supports_cond_breakpoints (self)) remote_add_target_side_condition (gdbarch, bp_tgt, p, endbuf); @@ -8401,6 +8401,8 @@ remote_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch, case PACKET_UNKNOWN: return -1; case PACKET_OK: + bp_tgt->placed_address = addr; + bp_tgt->placed_size = bpsize; return 0; } internal_error (__FILE__, __LINE__, diff --git a/gdb/x86-nat.c b/gdb/x86-nat.c index a016e6037fd..00274d31af3 100644 --- a/gdb/x86-nat.c +++ b/gdb/x86-nat.c @@ -211,7 +211,7 @@ x86_stopped_by_watchpoint (struct target_ops *ops) return x86_dr_stopped_by_watchpoint (state); } -/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address. +/* Insert a hardware-assisted breakpoint at BP_TGT->reqstd_address. Return 0 on success, EBUSY on failure. */ static int @@ -221,6 +221,7 @@ x86_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch, struct x86_debug_reg_state *state = x86_debug_reg_state (ptid_get_pid (inferior_ptid)); + bp_tgt->placed_address = bp_tgt->reqstd_address; return x86_dr_insert_watchpoint (state, hw_execute, bp_tgt->placed_address, 1) ? EBUSY : 0; }