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| author | Fernando Nasser <fnasser@redhat.com> | 2001-12-17 17:03:58 +0000 |
|---|---|---|
| committer | Fernando Nasser <fnasser@redhat.com> | 2001-12-17 17:03:58 +0000 |
| commit | 9512d7fdf54f8cb550c2b35b9605e02bd7976d8a (patch) | |
| tree | 1a2e9cf056b349a311dccad9b2d3f32ac0b2db50 /gdb/arm-tdep.c | |
| parent | c5c586eddbacd46011dc1135dcd093652c804d82 (diff) | |
| download | gdb-9512d7fdf54f8cb550c2b35b9605e02bd7976d8a.zip gdb-9512d7fdf54f8cb550c2b35b9605e02bd7976d8a.tar.gz gdb-9512d7fdf54f8cb550c2b35b9605e02bd7976d8a.tar.bz2 | |
2001-12-17 Fernando Nasser <fnasser@redhat.com>
From Richard Earnshaw <rearnsha@arm.com>:
* arm-tdep.c (arm_software_single_step): New function. Implements
software single-stepping for ARM targets.
(arm_get_next_pc, thumb_get_next_pc, bitcount, shifted_reg_val): Only
needed for software single-stepping.
* config/arm/tm-arm.h: Activate SOFTWARE_SINGLE_STEP_P.
Diffstat (limited to 'gdb/arm-tdep.c')
| -rw-r--r-- | gdb/arm-tdep.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c index afcc7f0..bec9c80 100644 --- a/gdb/arm-tdep.c +++ b/gdb/arm-tdep.c @@ -1532,6 +1532,8 @@ condition_true (unsigned long cond, unsigned long status_reg) return 1; } +#if SOFTWARE_SINGLE_STEP_P +/* Support routines for single stepping. Calculate the next PC value. */ #define submask(x) ((1L << ((x) + 1)) - 1) #define bit(obj,st) (((obj) >> (st)) & 1) #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) @@ -1866,6 +1868,32 @@ arm_get_next_pc (CORE_ADDR pc) return nextpc; } +/* single_step() is called just before we want to resume the inferior, + if we want to single-step it but there is no hardware or kernel + single-step support. We find the target of the coming instruction + and breakpoint it. + + single_step is also called just after the inferior stops. If we had + set up a simulated single-step, we undo our damage. */ + +void +arm_software_single_step (ignore, insert_bpt) + int ignore; /* Signal, not needed */ + int insert_bpt; +{ + static int next_pc; /* State between setting and unsetting. */ + static char break_mem[BREAKPOINT_MAX]; /* Temporary storage for mem@bpt */ + + if (insert_bpt) + { + next_pc = arm_get_next_pc (read_register (PC_REGNUM)); + target_insert_breakpoint (next_pc, &break_mem); + } + else + target_remove_breakpoint (next_pc, &break_mem); +} +#endif /* SOFTWARE_SINGLE_STEP_P */ + #include "bfd-in2.h" #include "libcoff.h" |