diff options
Diffstat (limited to 'gdb/gdbserver/i386-low.c')
| -rw-r--r-- | gdb/gdbserver/i386-low.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/gdb/gdbserver/i386-low.c b/gdb/gdbserver/i386-low.c index 304d6f3..d122ff7 100644 --- a/gdb/gdbserver/i386-low.c +++ b/gdb/gdbserver/i386-low.c @@ -21,6 +21,17 @@ #include "target.h" #include "i386-low.h" +/* Support for hardware watchpoints and breakpoints using the i386 + debug registers. + + This provides several functions for inserting and removing + hardware-assisted breakpoints and watchpoints, testing if one or + more of the watchpoints triggered and at what address, checking + whether a given region can be watched, etc. + + The functions below implement debug registers sharing by reference + counts, and allow to watch regions up to 16 bytes long. */ + /* Support for 8-byte wide hw watchpoints. */ #ifndef TARGET_HAS_DR_LEN_8 /* NOTE: sizeof (long) == 4 on win64. */ @@ -156,8 +167,7 @@ i386_low_init_dregs (struct i386_debug_reg_state *state) state->dr_status_mirror = 0; } -/* Print the values of the mirrored debug registers. This is enabled via - the "set debug-hw-points 1" monitor command. */ +/* Print the values of the mirrored debug registers. */ static void i386_show_dr (struct i386_debug_reg_state *state, @@ -427,7 +437,7 @@ i386_update_inferior_debug_regs (struct i386_debug_reg_state *inf_state, /* Insert a watchpoint to watch a memory region which starts at address ADDR and whose length is LEN bytes. Watch memory accesses - of the type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */ + of the type TYPE. Return 0 on success, -1 on failure. */ int i386_low_insert_watchpoint (struct i386_debug_reg_state *state, @@ -523,8 +533,8 @@ i386_low_region_ok_for_watchpoint (struct i386_debug_reg_state *state, } /* If the inferior has some break/watchpoint that triggered, set the - address associated with that break/watchpoint and return true. - Otherwise, return false. */ + address associated with that break/watchpoint and return non-zero. + Otherwise, return zero. */ int i386_low_stopped_data_address (struct i386_debug_reg_state *state, @@ -603,8 +613,8 @@ i386_low_stopped_data_address (struct i386_debug_reg_state *state, return rc; } -/* Return true if the inferior has some watchpoint that triggered. - Otherwise return false. */ +/* Return non-zero if the inferior has some watchpoint that triggered. + Otherwise return zero. */ int i386_low_stopped_by_watchpoint (struct i386_debug_reg_state *state) |