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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>, Jessica Yu <jeyu@kernel.org>,
	Marc Zyngier <maz@kernel.org>, Chris Down <chris@chrisdown.name>,
	Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH 04/13] openrisc: Add syscall details to emergency syscall debugging
Date: Sun, 15 May 2022 21:41:49 +0900	[thread overview]
Message-ID: <20220515124158.3167452-5-shorne@gmail.com> (raw)
In-Reply-To: <20220515124158.3167452-1-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


  parent reply	other threads:[~2022-05-15 12:42 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-15 12:41 [PATCH 00/13] OpenIRSC misc cleanups for 5.19 Stafford Horne
2022-05-15 12:41 ` [PATCH 01/13] openrisc: Add gcc machine instruction flag configuration Stafford Horne
2022-05-15 12:41 ` [PATCH 02/13] openrisc: Cleanup emergency print handling Stafford Horne
2022-05-15 16:03   ` Samuel Holland
2022-05-15 21:36     ` Stafford Horne
2022-05-15 12:41 ` [PATCH 03/13] openrisc: Add support for liteuart emergency printing Stafford Horne
2022-05-15 12:41 ` Stafford Horne [this message]
2022-05-15 12:41 ` [PATCH 05/13] openrisc: Pretty print show_registers memory dumps Stafford Horne
2022-05-15 12:41 ` [PATCH 06/13] openrisc: Update litex defconfig to support glibc userland Stafford Horne
2022-05-15 12:41 ` [PATCH 07/13] openrisc/traps: Declare file scope symbols as static Stafford Horne
2022-05-15 12:41 ` [PATCH 08/13] openrisc/traps: Remove die_if_kernel function Stafford Horne
2022-05-15 12:41 ` [PATCH 09/13] openrisc/traps: Declare unhandled_exception for asmlinkage Stafford Horne
2022-05-15 12:41 ` [PATCH 10/13] openrisc/time: Fix symbol scope warnings Stafford Horne
2022-05-15 12:41 ` [PATCH 11/13] openrisc/delay: Add include to fix symbol not declared warning Stafford Horne
2022-05-15 12:41 ` [PATCH 12/13] openrisc/fault: Fix symbol scope warnings Stafford Horne
2022-05-15 12:41 ` [PATCH 13/13] openrisc: Remove unused IMMU tlb workardound Stafford Horne

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