From: Antoine Tremblay <antoine.tremblay@ericsson.com>
To: <gdb-patches@sourceware.org>
Cc: Antoine Tremblay <antoine.tremblay@ericsson.com>
Subject: [PATCH v7 1/8] Replace breakpoint_reinsert_addr by get_next_pcs operation in GDBServer.
Date: Tue, 08 Dec 2015 14:07:00 -0000 [thread overview]
Message-ID: <1449583641-18156-2-git-send-email-antoine.tremblay@ericsson.com> (raw)
In-Reply-To: <1449583641-18156-1-git-send-email-antoine.tremblay@ericsson.com>
This patch in preparation for software single step support on ARM. It refactors
breakpoint_reinsert_addr into get_next_pcs so that multiple location can be
returned.
When software single stepping there can be multiple possible next addresses
because we're stepping over a conditional branch instruction, for example.
The operation get_next_pcs handles that by returning a vector of all the
possible next addresses.
Software breakpoints are installed at each location returned.
No regressions, tested on ubuntu 14.04 ARMv7 and x86.
With gdbserver-{native,extended} / { -marm -mthumb }
gdb/gdbserver/ChangeLog:
* linux-aarch64-low.c (the_low_targets): Rename
breakpoint_reinsert_addr to get_next_pcs.
* linux-arm-low.c (the_low_targets): Likewise.
* linux-bfin-low.c (the_low_targets): Likewise.
* linux-cris-low.c (the_low_targets): Likewise.
* linux-crisv32-low.c (the_low_targets): Likewise.
* linux-low.c (can_software_single_step): Likewise.
(install_software_single_step_breakpoints): New function.
(start_step_over): Use install_software_single_step_breakpoints.
* linux-low.h: New CORE_ADDR vector.
(struct linux_target_ops) Rename breakpoint_reinsert_addr to
get_next_pcs.
* linux-mips-low.c (the_low_targets): Likewise.
* linux-nios2-low.c (the_low_targets): Likewise.
* linux-sparc-low.c (the_low_targets): Likewise.
---
gdb/gdbserver/linux-aarch64-low.c | 2 +-
gdb/gdbserver/linux-arm-low.c | 2 +-
gdb/gdbserver/linux-bfin-low.c | 2 +-
gdb/gdbserver/linux-cris-low.c | 2 +-
gdb/gdbserver/linux-crisv32-low.c | 2 +-
gdb/gdbserver/linux-low.c | 27 +++++++++++++++++++++++----
gdb/gdbserver/linux-low.h | 5 ++++-
gdb/gdbserver/linux-mips-low.c | 2 +-
gdb/gdbserver/linux-nios2-low.c | 2 +-
gdb/gdbserver/linux-sparc-low.c | 2 +-
10 files changed, 35 insertions(+), 13 deletions(-)
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index 17798ff..3b8a9ad 100644
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -2963,7 +2963,7 @@ struct linux_target_ops the_low_target =
aarch64_set_pc,
NULL, /* breakpoint_kind_from_pc */
aarch64_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0, /* decr_pc_after_break */
aarch64_breakpoint_at,
aarch64_supports_z_point_type,
diff --git a/gdb/gdbserver/linux-arm-low.c b/gdb/gdbserver/linux-arm-low.c
index 7703008..f7de2b1 100644
--- a/gdb/gdbserver/linux-arm-low.c
+++ b/gdb/gdbserver/linux-arm-low.c
@@ -1030,7 +1030,7 @@ struct linux_target_ops the_low_target = {
arm_set_pc,
arm_breakpoint_kind_from_pc,
arm_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0,
arm_breakpoint_at,
arm_supports_z_point_type,
diff --git a/gdb/gdbserver/linux-bfin-low.c b/gdb/gdbserver/linux-bfin-low.c
index 912d253..1de2f78 100644
--- a/gdb/gdbserver/linux-bfin-low.c
+++ b/gdb/gdbserver/linux-bfin-low.c
@@ -141,7 +141,7 @@ struct linux_target_ops the_low_target = {
bfin_set_pc,
NULL, /* breakpoint_kind_from_pc */
bfin_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
2,
bfin_breakpoint_at,
NULL, /* supports_z_point_type */
diff --git a/gdb/gdbserver/linux-cris-low.c b/gdb/gdbserver/linux-cris-low.c
index 9f4519c..6902a45 100644
--- a/gdb/gdbserver/linux-cris-low.c
+++ b/gdb/gdbserver/linux-cris-low.c
@@ -139,7 +139,7 @@ struct linux_target_ops the_low_target = {
cris_set_pc,
NULL, /* breakpoint_kind_from_pc */
cris_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0,
cris_breakpoint_at,
};
diff --git a/gdb/gdbserver/linux-crisv32-low.c b/gdb/gdbserver/linux-crisv32-low.c
index 2404d0e..28c1981 100644
--- a/gdb/gdbserver/linux-crisv32-low.c
+++ b/gdb/gdbserver/linux-crisv32-low.c
@@ -422,7 +422,7 @@ struct linux_target_ops the_low_target = {
cris_set_pc,
NULL, /* breakpoint_kind_from_pc */
cris_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0,
cris_breakpoint_at,
cris_supports_z_point_type,
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index ec5337a..8a3c438 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -281,12 +281,12 @@ can_hardware_single_step (void)
}
/* True if the low target can software single-step. Such targets
- implement the BREAKPOINT_REINSERT_ADDR callback. */
+ implement the GET_NEXT_PCS callback. */
static int
can_software_single_step (void)
{
- return (the_low_target.breakpoint_reinsert_addr != NULL);
+ return (the_low_target.get_next_pcs != NULL);
}
/* True if the low target supports memory breakpoints. If so, we'll
@@ -3957,6 +3957,26 @@ enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info)
lwp->pending_signals = p_sig;
}
+/* Install breakpoints for software single stepping. */
+
+static void
+install_software_single_step_breakpoints (struct lwp_info *lwp)
+{
+ int i;
+ CORE_ADDR pc;
+ struct regcache *regcache = get_thread_regcache (current_thread, 1);
+ VEC (CORE_ADDR) *next_pcs = NULL;
+ struct cleanup *old_chain = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
+
+ pc = get_pc (lwp);
+ next_pcs = (*the_low_target.get_next_pcs) (pc, regcache);
+
+ for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i)
+ set_reinsert_breakpoint (pc);
+
+ do_cleanups (old_chain);
+}
+
/* Resume execution of LWP. If STEP is nonzero, single-step it. If
SIGNAL is nonzero, give it that signal. */
@@ -4522,8 +4542,7 @@ start_step_over (struct lwp_info *lwp)
}
else if (can_software_single_step ())
{
- CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) ();
- set_reinsert_breakpoint (raddr);
+ install_software_single_step_breakpoints (lwp);
step = 0;
}
else
diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h
index c211a37..cd455a8 100644
--- a/gdb/gdbserver/linux-low.h
+++ b/gdb/gdbserver/linux-low.h
@@ -124,6 +124,8 @@ struct process_info_private
struct lwp_info;
+DEF_VEC_I (CORE_ADDR);
+
struct linux_target_ops
{
/* Architecture-specific setup. */
@@ -153,7 +155,8 @@ struct linux_target_ops
/* See target.h for details. */
const gdb_byte *(*sw_breakpoint_from_kind) (int kind, int *size);
- CORE_ADDR (*breakpoint_reinsert_addr) (void);
+ /* Find the next possible PCs after the current instruction executes. */
+ VEC (CORE_ADDR) *(*get_next_pcs) (CORE_ADDR pc, struct regcache *regcache);
int decr_pc_after_break;
int (*breakpoint_at) (CORE_ADDR pc);
diff --git a/gdb/gdbserver/linux-mips-low.c b/gdb/gdbserver/linux-mips-low.c
index b8f8805..9da4610 100644
--- a/gdb/gdbserver/linux-mips-low.c
+++ b/gdb/gdbserver/linux-mips-low.c
@@ -880,7 +880,7 @@ struct linux_target_ops the_low_target = {
mips_set_pc,
NULL, /* breakpoint_kind_from_pc */
mips_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0,
mips_breakpoint_at,
mips_supports_z_point_type,
diff --git a/gdb/gdbserver/linux-nios2-low.c b/gdb/gdbserver/linux-nios2-low.c
index 9380c3b..1accc03 100644
--- a/gdb/gdbserver/linux-nios2-low.c
+++ b/gdb/gdbserver/linux-nios2-low.c
@@ -267,7 +267,7 @@ struct linux_target_ops the_low_target =
nios2_set_pc,
NULL, /* breakpoint_kind_from_pc */
nios2_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0,
nios2_breakpoint_at,
};
diff --git a/gdb/gdbserver/linux-sparc-low.c b/gdb/gdbserver/linux-sparc-low.c
index 54a849c..bfdd8c1 100644
--- a/gdb/gdbserver/linux-sparc-low.c
+++ b/gdb/gdbserver/linux-sparc-low.c
@@ -320,7 +320,7 @@ struct linux_target_ops the_low_target = {
NULL,
NULL, /* breakpoint_kind_from_pc */
sparc_sw_breakpoint_from_kind,
- NULL, /* breakpoint_reinsert_addr */
+ NULL, /* get_next_pcs */
0,
sparc_breakpoint_at,
NULL, /* supports_z_point_type */
--
2.6.3
next prev parent reply other threads:[~2015-12-08 14:07 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-08 14:07 [PATCH v7 0/8] Support software single step and conditional breakpoints on ARM " Antoine Tremblay
2015-12-08 14:07 ` [PATCH v7 4/8] Refactor arm_software_single_step to use regcache Antoine Tremblay
2015-12-11 11:37 ` Yao Qi
2015-12-11 12:41 ` Antoine Tremblay
2015-12-08 14:07 ` [PATCH v7 3/8] Use xml-syscall to compare syscall numbers in arm_linux_sigreturn_return-addr Antoine Tremblay
2015-12-11 11:29 ` Yao Qi
2015-12-11 11:59 ` Pedro Alves
2015-12-11 12:02 ` Yao Qi
2015-12-11 12:05 ` Pedro Alves
2015-12-11 12:31 ` Antoine Tremblay
2015-12-11 12:47 ` Pedro Alves
2015-12-11 13:04 ` Antoine Tremblay
2015-12-11 13:20 ` Pedro Alves
2015-12-11 13:25 ` Antoine Tremblay
2015-12-15 12:46 ` Antoine Tremblay
2015-12-16 15:59 ` Pedro Alves
2015-12-16 16:36 ` Yao Qi
2015-12-16 16:37 ` Antoine Tremblay
2015-12-11 12:29 ` Antoine Tremblay
2015-12-16 15:59 ` Pedro Alves
2015-12-16 16:05 ` Antoine Tremblay
2015-12-16 16:24 ` [PATCH v7.1 " Antoine Tremblay
2015-12-17 10:09 ` Yao Qi
2015-12-17 10:17 ` Pedro Alves
2015-12-17 12:51 ` Antoine Tremblay
2015-12-17 13:25 ` Yao Qi
2015-12-17 13:36 ` Antoine Tremblay
2015-12-08 14:07 ` [PATCH v7 5/8] Share regcache function regcache_raw_read_unsigned Antoine Tremblay
2015-12-08 14:07 ` Antoine Tremblay [this message]
2015-12-08 14:07 ` [PATCH v7 2/8] Share some ARM target dependent code from GDB with GDBServer Antoine Tremblay
2015-12-08 14:08 ` [PATCH v7 8/8] Enable conditional breakpoints for targets that support software single step in GDBServer Antoine Tremblay
2015-12-08 14:08 ` [PATCH v7 7/8] Enable software single stepping for while-stepping actions " Antoine Tremblay
2015-12-08 14:08 ` [PATCH v7 6/8] Support software single step on ARM " Antoine Tremblay
2015-12-09 20:09 ` [PATCH v7.1] " Antoine Tremblay
2015-12-11 13:28 ` Yao Qi
2015-12-11 13:36 ` Antoine Tremblay
2015-12-11 13:41 ` Antoine Tremblay
2015-12-11 14:45 ` Yao Qi
2015-12-11 14:43 ` Yao Qi
2015-12-11 15:06 ` Antoine Tremblay
2015-12-11 15:26 ` Antoine Tremblay
2015-12-11 15:38 ` Yao Qi
2015-12-11 16:11 ` Antoine Tremblay
2015-12-11 16:26 ` [PATCH v7.2] " Antoine Tremblay
2015-12-11 17:28 ` Yao Qi
2015-12-11 17:52 ` Antoine Tremblay
2015-12-10 15:59 ` [PATCH v7 0/8] Support software single step and conditional breakpoints " Yao Qi
2015-12-10 16:02 ` Antoine Tremblay
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