Messages in this thread Patch in this message | | | From | David Howells <> | Subject | [PATCH] FRV debugging fixes | Date | Tue, 14 Dec 2004 16:11:39 +0000 |
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The attached patch fixes three debugging problems in the frv arch:
(1) Single-stepping in userspace steps through into the kernel-mode interrupt handler when a hardware interrupt happens, and sometimes it gets past where the debug-mode handler would normally catch it. This patch extends the range of detected PC values.
(2) When setting up the kernel-mode exception frame from the debug-mode handler for a userspace debugging event, we weren't setting the LR register to generate a return to the exception handler epilogue.
(3) sys_ptrace() now needs to "put" the inferior task_struct not "free" it as was done in 2.4.
Signed-Off-By: David Howells <dhowells@redhat.com> --- warthog>diffstat frv-debug-2610rc3.diff break.S | 7 +++++++ ptrace.c | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-)
diff -uNr linux-2.6.10-rc3-mm1-mmcleanup/arch/frv/kernel/break.S linux-2.6.10-rc3-mm1-misc/arch/frv/kernel/break.S --- linux-2.6.10-rc3-mm1-mmcleanup/arch/frv/kernel/break.S 2004-12-13 17:33:50.000000000 +0000 +++ linux-2.6.10-rc3-mm1-misc/arch/frv/kernel/break.S 2004-12-13 19:28:04.000000000 +0000 @@ -202,6 +202,10 @@ setlo %lo(__entry_kernel_external_interrupt),gr3 subcc gr2,gr3,gr0,icc0 beq icc0,#2,__break_step_kernel_external_interrupt + sethi.p %hi(__entry_uspace_external_interrupt),gr3 + setlo %lo(__entry_uspace_external_interrupt),gr3 + subcc gr2,gr3,gr0,icc0 + beq icc0,#2,__break_step_uspace_external_interrupt LEDS 0x2007,gr2 @@ -483,6 +487,9 @@ movgs gr2,bpsr # return through remainder of the exception prologue + # - need to load gr23 with return handler address + sethi.p %hi(__entry_return_from_user_exception),gr23 + setlo %lo(__entry_return_from_user_exception),gr23 sethi.p %hi(__entry_common),gr3 setlo %lo(__entry_common),gr3 movgs gr3,bpcsr diff -uNr linux-2.6.10-rc3-mm1-mmcleanup/arch/frv/kernel/ptrace.c linux-2.6.10-rc3-mm1-misc/arch/frv/kernel/ptrace.c --- linux-2.6.10-rc3-mm1-mmcleanup/arch/frv/kernel/ptrace.c 2004-12-13 17:33:50.000000000 +0000 +++ linux-2.6.10-rc3-mm1-misc/arch/frv/kernel/ptrace.c 2004-12-13 19:28:11.000000000 +0000 @@ -358,7 +358,7 @@ break; } out_tsk: - free_task_struct(child); + put_task_struct(child); out: unlock_kernel(); return ret; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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