From: Stafford Horne <shorne@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Openrisc <openrisc@lists.librecores.org>,
Stafford Horne <shorne@gmail.com>,
Andrey Bacherov <bandvig@mail.ru>,
Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Randy Dunlap <rdunlap@infradead.org>,
Petr Mladek <pmladek@suse.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Chris Down <chris@chrisdown.name>,
Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH v2 04/13] openrisc: Add syscall details to emergency syscall debugging
Date: Tue, 17 May 2022 09:55:01 +0900 [thread overview]
Message-ID: <20220517005510.3500105-5-shorne@gmail.com> (raw)
In-Reply-To: <20220517005510.3500105-1-shorne@gmail.com>
When bringing linux on the or1k Marocchino we ran into issues starting
init. This patch adds the syscall number and return address to
assist tracing syscalls even before strace is able to be used.
By default this is all disabled but a developer could adjust the ifdef
to enable debugging.
Cc: Andrey Bacherov <bandvig@mail.ru>
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
arch/openrisc/kernel/entry.S | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S
index 3ca1b1f490b9..54a87bba35ca 100644
--- a/arch/openrisc/kernel/entry.S
+++ b/arch/openrisc/kernel/entry.S
@@ -601,7 +601,7 @@ UNHANDLED_EXCEPTION(_vector_0xb00,0xb00)
*/
_string_syscall_return:
- .string "syscall return %ld \n\r\0"
+ .string "syscall r9:0x%08x -> syscall(%ld) return %ld\0"
.align 4
ENTRY(_sys_call_handler)
@@ -679,15 +679,25 @@ _syscall_return:
_syscall_debug:
l.movhi r3,hi(_string_syscall_return)
l.ori r3,r3,lo(_string_syscall_return)
- l.ori r27,r0,1
+ l.ori r27,r0,2
l.sw -4(r1),r27
l.sw -8(r1),r11
- l.addi r1,r1,-8
+ l.lwz r29,PT_ORIG_GPR11(r1)
+ l.sw -12(r1),r29
+ l.lwz r29,PT_GPR9(r1)
+ l.sw -16(r1),r29
l.movhi r27,hi(_printk)
l.ori r27,r27,lo(_printk)
l.jalr r27
- l.nop
- l.addi r1,r1,8
+ l.addi r1,r1,-16
+ l.addi r1,r1,16
+#endif
+#if 0
+_syscall_show_regs:
+ l.movhi r27,hi(show_registers)
+ l.ori r27,r27,lo(show_registers)
+ l.jalr r27
+ l.or r3,r1,r1
#endif
_syscall_check_trace_leave:
--
2.31.1
next prev parent reply other threads:[~2022-05-17 0:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-17 0:54 [PATCH v2 00/13] OpenRISC misc cleanups for 5.19 Stafford Horne
2022-05-17 0:54 ` [PATCH v2 01/13] openrisc: Add gcc machine instruction flag configuration Stafford Horne
2022-05-17 21:27 ` Stafford Horne
2022-05-17 0:54 ` [PATCH v2 02/13] openrisc: Cleanup emergency print handling Stafford Horne
2022-05-17 0:55 ` [PATCH v2 03/13] openrisc: Add support for liteuart emergency printing Stafford Horne
2022-05-17 0:55 ` Stafford Horne [this message]
2022-05-17 0:55 ` [PATCH v2 05/13] openrisc: Pretty print show_registers memory dumps Stafford Horne
2022-05-17 0:55 ` [PATCH v2 06/13] openrisc: Update litex defconfig to support glibc userland Stafford Horne
2022-05-17 0:55 ` [PATCH v2 07/13] openrisc/traps: Declare file scope symbols as static Stafford Horne
2022-05-17 0:55 ` [PATCH v2 08/13] openrisc/traps: Remove die_if_kernel function Stafford Horne
2022-05-17 0:55 ` [PATCH v2 09/13] openrisc/traps: Declare unhandled_exception for asmlinkage Stafford Horne
2022-05-17 0:55 ` [PATCH v2 10/13] openrisc/time: Fix symbol scope warnings Stafford Horne
2022-05-17 0:55 ` [PATCH v2 11/13] openrisc/delay: Add include to fix symbol not declared warning Stafford Horne
2022-05-17 0:55 ` [PATCH v2 12/13] openrisc/fault: Fix symbol scope warnings Stafford Horne
2022-05-17 0:55 ` [PATCH v2 13/13] openrisc: Remove unused IMMU tlb workardound Stafford Horne
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