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authorWu Zhou <woodzltc@cn.ibm.com>2006-02-08 05:41:06 +0000
committerWu Zhou <woodzltc@cn.ibm.com>2006-02-08 05:41:06 +0000
commite0d24f8d6e485843de9fac1ba21412491e07be7b (patch)
treed7c85f32289f7427f9d05d1bc0edd424c028d3cf /gdb/ppc-linux-nat.c
parent0d2a63896314177cbf183995e4a4907a4723688b (diff)
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* ppc-linux-nat.c (PTRACE_GET_DEBUGREG, PTRACE_SET_DEBUGREG,
PTRACE_GETSIGINFO): Define. (last_stopped_data_address): New. (ppc_linux_check_watch_resources): New function. (ppc_linux_region_ok_for_hw_watchpoint): New function. (ppc_linux_insert_watchpoint): New function. (ppc_linux_remove_watchpoint): New function. (ppc_linux_stopped_data_address): New function. (ppc_linux_stopped_by_watchpoint): New function. (_initialize_ppc_linux_nat): Set the above hardware watchpoint related target vectors. * rs6000-tdep.c (rs6000_gdbarch_init): Set PPC architectures to have nonsteppable watchpoint. * target.c (default_region_ok_for_hw_watchpoint, debug_to_region_ok_for_hw_watchpoint): New prototypes. (update_current_target): Inherit to_region_ok_for_hw_watchpoint and set default to_region_ok_for_hw_watchpoint. (default_region_ok_for_hw_watchpoint): New function. (debug_to_region_ok_for_hw_watchpoint): New function. (setup_target_debug): Set to_region_ok_for_hw_watchpoint of debug_target. * target.h (struct target_ops): Add a new target vector to_region_ok_for_hw_watchpoint. (TARGET_REGION_OK_FOR_HW_WATCHPOINT): Define this if it is not defined anyplace else.
Diffstat (limited to 'gdb/ppc-linux-nat.c')
-rw-r--r--gdb/ppc-linux-nat.c138
1 files changed, 137 insertions, 1 deletions
diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c
index c8c9376..b52eca2 100644
--- a/gdb/ppc-linux-nat.c
+++ b/gdb/ppc-linux-nat.c
@@ -81,6 +81,16 @@
#define PTRACE_SETEVRREGS 21
#endif
+/* Similarly for the hardware watchpoint support. */
+#ifndef PTRACE_GET_DEBUGREG
+#define PTRACE_GET_DEBUGREG 25
+#endif
+#ifndef PTRACE_SET_DEBUGREG
+#define PTRACE_SET_DEBUGREG 26
+#endif
+#ifndef PTRACE_GETSIGINFO
+#define PTRACE_GETSIGINFO 0x4202
+#endif
/* This oddity is because the Linux kernel defines elf_vrregset_t as
an array of 33 16 bytes long elements. I.e. it leaves out vrsave.
@@ -146,6 +156,7 @@ struct gdb_evrregset_t
error. */
int have_ptrace_getvrregs = 1;
+static CORE_ADDR last_stopped_data_address = 0;
/* Non-zero if our kernel may support the PTRACE_GETEVRREGS and
PTRACE_SETEVRREGS requests, for reading and writing the SPE
@@ -153,7 +164,6 @@ int have_ptrace_getvrregs = 1;
error. */
int have_ptrace_getsetevrregs = 1;
-
int
kernel_u_size (void)
{
@@ -777,6 +787,124 @@ store_ppc_registers (int tid)
store_spe_register (tid, -1);
}
+static int
+ppc_linux_check_watch_resources (int type, int cnt, int ot)
+{
+ int tid;
+ ptid_t ptid = inferior_ptid;
+
+ /* DABR (data address breakpoint register) is optional for PPC variants.
+ Some variants have one DABR, others have none. So CNT can't be larger
+ than 1. */
+ if (cnt > 1)
+ return 0;
+
+ /* We need to know whether ptrace supports PTRACE_SET_DEBUGREG and whether
+ the target has DABR. If either answer is no, the ptrace call will
+ return -1. Fail in that case. */
+ tid = TIDGET (ptid);
+ if (tid == 0)
+ tid = PIDGET (ptid);
+
+ if (ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0) == -1)
+ return 0;
+ return 1;
+}
+
+static int
+ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
+{
+ /* Handle sub-8-byte quantities. */
+ if (len <= 0)
+ return 0;
+
+ /* addr+len must fall in the 8 byte watchable region. */
+ if ((addr + len) > (addr & ~7) + 8)
+ return 0;
+
+ return 1;
+}
+
+/* Set a watchpoint of type TYPE at address ADDR. */
+static long
+ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw)
+{
+ int tid;
+ long dabr_value;
+ ptid_t ptid = inferior_ptid;
+
+ dabr_value = addr & ~7;
+ switch (rw)
+ {
+ case hw_read:
+ /* Set read and translate bits. */
+ dabr_value |= 5;
+ break;
+ case hw_write:
+ /* Set write and translate bits. */
+ dabr_value |= 6;
+ break;
+ case hw_access:
+ /* Set read, write and translate bits. */
+ dabr_value |= 7;
+ break;
+ }
+
+ tid = TIDGET (ptid);
+ if (tid == 0)
+ tid = PIDGET (ptid);
+
+ return ptrace (PTRACE_SET_DEBUGREG, tid, 0, dabr_value);
+}
+
+static long
+ppc_linux_remove_watchpoint (CORE_ADDR addr, int len)
+{
+ int tid;
+ ptid_t ptid = inferior_ptid;
+
+ tid = TIDGET (ptid);
+ if (tid == 0)
+ tid = PIDGET (ptid);
+
+ return ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0);
+}
+
+static int
+ppc_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
+{
+ if (last_stopped_data_address)
+ {
+ *addr_p = last_stopped_data_address;
+ last_stopped_data_address = 0;
+ return 1;
+ }
+ return 0;
+}
+
+static int
+ppc_linux_stopped_by_watchpoint (void)
+{
+ int tid;
+ struct siginfo siginfo;
+ ptid_t ptid = inferior_ptid;
+ CORE_ADDR *addr_p;
+
+ tid = TIDGET(ptid);
+ if (tid == 0)
+ tid = PIDGET (ptid);
+
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, tid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+
+ if (errno != 0 || siginfo.si_signo != SIGTRAP ||
+ (siginfo.si_code & 0xffff) != 0x0004)
+ return 0;
+
+ last_stopped_data_address = (CORE_ADDR) siginfo.si_addr;
+ return 1;
+}
+
static void
ppc_linux_store_inferior_registers (int regno)
{
@@ -900,6 +1028,14 @@ _initialize_ppc_linux_nat (void)
t->to_fetch_registers = ppc_linux_fetch_inferior_registers;
t->to_store_registers = ppc_linux_store_inferior_registers;
+ /* Add our watchpoint methods. */
+ t->to_can_use_hw_breakpoint = ppc_linux_check_watch_resources;
+ t->to_region_ok_for_hw_watchpoint = ppc_linux_region_ok_for_hw_watchpoint;
+ t->to_insert_watchpoint = ppc_linux_insert_watchpoint;
+ t->to_remove_watchpoint = ppc_linux_remove_watchpoint;
+ t->to_stopped_by_watchpoint = ppc_linux_stopped_by_watchpoint;
+ t->to_stopped_data_address = ppc_linux_stopped_data_address;
+
/* Register the target. */
add_target (t);
}