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return zero in arm_linux_can_use_hw_breakpoint if HW point isn't supported

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This patch is to cherry-pick part of Pedro's patch here
https://sourceware.org/ml/gdb-patches/2015-04/msg00527.html in which
zero is returned if the HW point isn't supported.

In arm-linux native gdb testing on a board doesn't support HW breakpoint,
without this patch, the output in gdb.base/breakpoint-in-ro-region.exp is like:

(gdb) hbreak *0x83bc^M
Hardware breakpoints used exceeds limit.^M
(gdb) PASS: gdb.base/breakpoint-in-ro-region.exp: probe hbreak support (support)

with this patch, the output becomes:

(gdb) hbreak *0x83bc^M
No hardware breakpoint support in the target.^M
(gdb) PASS: gdb.base/breakpoint-in-ro-region.exp: probe hbreak support (no support)

As a result, the following fails are fixed.

-FAIL: gdb.base/breakpoint-in-ro-region.exp: always-inserted off: auto-hw on: step in ro region (cannot insert hw break)
-FAIL: gdb.base/breakpoint-in-ro-region.exp: always-inserted off: auto-hw on: thread advanced
-FAIL: gdb.base/breakpoint-in-ro-region.exp: always-inserted on: auto-hw on: step in ro region (cannot insert hw break)
-FAIL: gdb.base/breakpoint-in-ro-region.exp: always-inserted on: auto-hw on: thread advanced

gdb:

2015-04-17  Pedro Alves  <palves@redhat.com>

	* arm-linux-nat.c (arm_linux_can_use_hw_breakpoint): Return zero
	if HW point of TYPE isn't supported.
This commit is contained in:
Yao Qi 2015-04-17 13:52:44 +01:00
parent 059790a0c8
commit dbbf180a81
2 changed files with 15 additions and 2 deletions
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5
gdb/ChangeLog
View file

@ -1,3 +1,8 @@
2015-04-17 Pedro Alves <palves@redhat.com>
* arm-linux-nat.c (arm_linux_can_use_hw_breakpoint): Return zero
if HW point of TYPE isn't supported.
2015-04-17 Yao Qi <yao.qi@linaro.org>
Pedro Alves <palves@redhat.com>

12
gdb/arm-linux-nat.c
View file

@ -771,12 +771,20 @@ arm_linux_can_use_hw_breakpoint (struct target_ops *self,
if (type == bp_hardware_watchpoint || type == bp_read_watchpoint
|| type == bp_access_watchpoint || type == bp_watchpoint)
{
if (cnt + ot > arm_linux_get_hw_watchpoint_count ())
int count = arm_linux_get_hw_watchpoint_count ();
if (count == 0)
return 0;
else if (cnt + ot > count)
return -1;
}
else if (type == bp_hardware_breakpoint)
{
if (cnt > arm_linux_get_hw_breakpoint_count ())
int count = arm_linux_get_hw_breakpoint_count ();
if (count == 0)
return 0;
else if (cnt > count)
return -1;
}
else