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* [PATCH] rethook: add riscv rethook implementation.
@ 2022-09-22  4:04 Binglei Wang
  2022-09-22  8:40 ` kernel test robot
                   ` (2 more replies)
  0 siblings, 3 replies; 11+ messages in thread
From: Binglei Wang @ 2022-09-22  4:04 UTC (permalink / raw)
  To: paul.walmsley, palmer, aou, naveen.n.rao, anil.s.keshavamurthy,
	davem, hiramat
  Cc: linux-riscv, linux-kernel, Binglei Wang

From: Binglei Wang <l3b2w1@gmail.com>

Implement the kretprobes on riscv arch by using rethook machenism
which abstracts general kretprobe info into a struct rethook_node
to be embedded in the struct kretprobe_instance.

Signed-off-by: Binglei Wang <l3b2w1@gmail.com>
---
 arch/riscv/Kconfig                            |  1 +
 arch/riscv/kernel/probes/Makefile             |  1 +
 arch/riscv/kernel/probes/kprobes.c            |  8 --
 arch/riscv/kernel/probes/kprobes_trampoline.S | 73 +----------------
 arch/riscv/kernel/probes/kprobes_trampoline.h | 79 +++++++++++++++++++
 arch/riscv/kernel/probes/rethook.c            | 26 ++++++
 arch/riscv/kernel/probes/rethook_trampoline.S | 22 ++++++
 include/linux/kprobes.h                       | 18 ++++-
 8 files changed, 146 insertions(+), 82 deletions(-)
 create mode 100644 arch/riscv/kernel/probes/kprobes_trampoline.h
 create mode 100644 arch/riscv/kernel/probes/rethook.c
 create mode 100644 arch/riscv/kernel/probes/rethook_trampoline.S

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index ed66c31e4..c5cae0825 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -97,6 +97,7 @@ config RISCV
 	select HAVE_KPROBES if !XIP_KERNEL
 	select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
 	select HAVE_KRETPROBES if !XIP_KERNEL
+	select HAVE_RETHOOK if !XIP_KERNEL
 	select HAVE_MOVE_PMD
 	select HAVE_MOVE_PUD
 	select HAVE_PCI
diff --git a/arch/riscv/kernel/probes/Makefile b/arch/riscv/kernel/probes/Makefile
index 7f0840dcc..ee345e7e9 100644
--- a/arch/riscv/kernel/probes/Makefile
+++ b/arch/riscv/kernel/probes/Makefile
@@ -3,4 +3,5 @@ obj-$(CONFIG_KPROBES)		+= kprobes.o decode-insn.o simulate-insn.o
 obj-$(CONFIG_KPROBES)		+= kprobes_trampoline.o
 obj-$(CONFIG_KPROBES_ON_FTRACE)	+= ftrace.o
 obj-$(CONFIG_UPROBES)		+= uprobes.o decode-insn.o simulate-insn.o
+obj-$(CONFIG_RETHOOK) 		+= rethook.o rethook_trampoline.o
 CFLAGS_REMOVE_simulate-insn.o = $(CC_FLAGS_FTRACE)
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
index e6e950b7c..04911cc42 100644
--- a/arch/riscv/kernel/probes/kprobes.c
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -350,14 +350,6 @@ void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
 	return (void *)kretprobe_trampoline_handler(regs, NULL);
 }
 
-void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
-				      struct pt_regs *regs)
-{
-	ri->ret_addr = (kprobe_opcode_t *)regs->ra;
-	ri->fp = NULL;
-	regs->ra = (unsigned long) &__kretprobe_trampoline;
-}
-
 int __kprobes arch_trampoline_kprobe(struct kprobe *p)
 {
 	return 0;
diff --git a/arch/riscv/kernel/probes/kprobes_trampoline.S b/arch/riscv/kernel/probes/kprobes_trampoline.S
index 7bdb09ded..54937f342 100644
--- a/arch/riscv/kernel/probes/kprobes_trampoline.S
+++ b/arch/riscv/kernel/probes/kprobes_trampoline.S
@@ -2,78 +2,7 @@
 /*
  * Author: Patrick Stählin <me@packi.ch>
  */
-#include <linux/linkage.h>
-
-#include <asm/asm.h>
-#include <asm/asm-offsets.h>
-
-	.text
-	.altmacro
-
-	.macro save_all_base_regs
-	REG_S x1,  PT_RA(sp)
-	REG_S x3,  PT_GP(sp)
-	REG_S x4,  PT_TP(sp)
-	REG_S x5,  PT_T0(sp)
-	REG_S x6,  PT_T1(sp)
-	REG_S x7,  PT_T2(sp)
-	REG_S x8,  PT_S0(sp)
-	REG_S x9,  PT_S1(sp)
-	REG_S x10, PT_A0(sp)
-	REG_S x11, PT_A1(sp)
-	REG_S x12, PT_A2(sp)
-	REG_S x13, PT_A3(sp)
-	REG_S x14, PT_A4(sp)
-	REG_S x15, PT_A5(sp)
-	REG_S x16, PT_A6(sp)
-	REG_S x17, PT_A7(sp)
-	REG_S x18, PT_S2(sp)
-	REG_S x19, PT_S3(sp)
-	REG_S x20, PT_S4(sp)
-	REG_S x21, PT_S5(sp)
-	REG_S x22, PT_S6(sp)
-	REG_S x23, PT_S7(sp)
-	REG_S x24, PT_S8(sp)
-	REG_S x25, PT_S9(sp)
-	REG_S x26, PT_S10(sp)
-	REG_S x27, PT_S11(sp)
-	REG_S x28, PT_T3(sp)
-	REG_S x29, PT_T4(sp)
-	REG_S x30, PT_T5(sp)
-	REG_S x31, PT_T6(sp)
-	.endm
-
-	.macro restore_all_base_regs
-	REG_L x3,  PT_GP(sp)
-	REG_L x4,  PT_TP(sp)
-	REG_L x5,  PT_T0(sp)
-	REG_L x6,  PT_T1(sp)
-	REG_L x7,  PT_T2(sp)
-	REG_L x8,  PT_S0(sp)
-	REG_L x9,  PT_S1(sp)
-	REG_L x10, PT_A0(sp)
-	REG_L x11, PT_A1(sp)
-	REG_L x12, PT_A2(sp)
-	REG_L x13, PT_A3(sp)
-	REG_L x14, PT_A4(sp)
-	REG_L x15, PT_A5(sp)
-	REG_L x16, PT_A6(sp)
-	REG_L x17, PT_A7(sp)
-	REG_L x18, PT_S2(sp)
-	REG_L x19, PT_S3(sp)
-	REG_L x20, PT_S4(sp)
-	REG_L x21, PT_S5(sp)
-	REG_L x22, PT_S6(sp)
-	REG_L x23, PT_S7(sp)
-	REG_L x24, PT_S8(sp)
-	REG_L x25, PT_S9(sp)
-	REG_L x26, PT_S10(sp)
-	REG_L x27, PT_S11(sp)
-	REG_L x28, PT_T3(sp)
-	REG_L x29, PT_T4(sp)
-	REG_L x30, PT_T5(sp)
-	REG_L x31, PT_T6(sp)
-	.endm
+#include "kprobes_trampoline.h"
 
 ENTRY(__kretprobe_trampoline)
 	addi sp, sp, -(PT_SIZE_ON_STACK)
diff --git a/arch/riscv/kernel/probes/kprobes_trampoline.h b/arch/riscv/kernel/probes/kprobes_trampoline.h
new file mode 100644
index 000000000..48895a5e3
--- /dev/null
+++ b/arch/riscv/kernel/probes/kprobes_trampoline.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+#ifndef _KPROBES_TRAMPOLINE_H
+#define _KPROBES_TRAMPOLINE_H
+/*
+ * Author: Patrick Stählin <me@packi.ch>
+ */
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+
+	.text
+	.altmacro
+
+	.macro save_all_base_regs
+	REG_S x1,  PT_RA(sp)
+	REG_S x3,  PT_GP(sp)
+	REG_S x4,  PT_TP(sp)
+	REG_S x5,  PT_T0(sp)
+	REG_S x6,  PT_T1(sp)
+	REG_S x7,  PT_T2(sp)
+	REG_S x8,  PT_S0(sp)
+	REG_S x9,  PT_S1(sp)
+	REG_S x10, PT_A0(sp)
+	REG_S x11, PT_A1(sp)
+	REG_S x12, PT_A2(sp)
+	REG_S x13, PT_A3(sp)
+	REG_S x14, PT_A4(sp)
+	REG_S x15, PT_A5(sp)
+	REG_S x16, PT_A6(sp)
+	REG_S x17, PT_A7(sp)
+	REG_S x18, PT_S2(sp)
+	REG_S x19, PT_S3(sp)
+	REG_S x20, PT_S4(sp)
+	REG_S x21, PT_S5(sp)
+	REG_S x22, PT_S6(sp)
+	REG_S x23, PT_S7(sp)
+	REG_S x24, PT_S8(sp)
+	REG_S x25, PT_S9(sp)
+	REG_S x26, PT_S10(sp)
+	REG_S x27, PT_S11(sp)
+	REG_S x28, PT_T3(sp)
+	REG_S x29, PT_T4(sp)
+	REG_S x30, PT_T5(sp)
+	REG_S x31, PT_T6(sp)
+	.endm
+
+	.macro restore_all_base_regs
+	REG_L x3,  PT_GP(sp)
+	REG_L x4,  PT_TP(sp)
+	REG_L x5,  PT_T0(sp)
+	REG_L x6,  PT_T1(sp)
+	REG_L x7,  PT_T2(sp)
+	REG_L x8,  PT_S0(sp)
+	REG_L x9,  PT_S1(sp)
+	REG_L x10, PT_A0(sp)
+	REG_L x11, PT_A1(sp)
+	REG_L x12, PT_A2(sp)
+	REG_L x13, PT_A3(sp)
+	REG_L x14, PT_A4(sp)
+	REG_L x15, PT_A5(sp)
+	REG_L x16, PT_A6(sp)
+	REG_L x17, PT_A7(sp)
+	REG_L x18, PT_S2(sp)
+	REG_L x19, PT_S3(sp)
+	REG_L x20, PT_S4(sp)
+	REG_L x21, PT_S5(sp)
+	REG_L x22, PT_S6(sp)
+	REG_L x23, PT_S7(sp)
+	REG_L x24, PT_S8(sp)
+	REG_L x25, PT_S9(sp)
+	REG_L x26, PT_S10(sp)
+	REG_L x27, PT_S11(sp)
+	REG_L x28, PT_T3(sp)
+	REG_L x29, PT_T4(sp)
+	REG_L x30, PT_T5(sp)
+	REG_L x31, PT_T6(sp)
+	.endm
+#endif
diff --git a/arch/riscv/kernel/probes/rethook.c b/arch/riscv/kernel/probes/rethook.c
new file mode 100644
index 000000000..4a41d5eb6
--- /dev/null
+++ b/arch/riscv/kernel/probes/rethook.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic return hook for riscv.
+ */
+
+#include <linux/kprobes.h>
+#include <linux/rethook.h>
+
+/* This is called from arch_rethook_trampoline() */
+unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
+{
+	return rethook_trampoline_handler(regs, regs->s0);
+}
+NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
+
+
+void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
+{
+	rhn->ret_addr = regs->ra;
+	rhn->frame = regs->s0;
+
+	/* replace return addr with trampoline */
+	regs->ra = (u64)arch_rethook_trampoline;
+}
+NOKPROBE_SYMBOL(arch_rethook_prepare);
+
diff --git a/arch/riscv/kernel/probes/rethook_trampoline.S b/arch/riscv/kernel/probes/rethook_trampoline.S
new file mode 100644
index 000000000..e81c3d4e0
--- /dev/null
+++ b/arch/riscv/kernel/probes/rethook_trampoline.S
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Author: Patrick Stählin <me@packi.ch>
+ */
+#include "kprobes_trampoline.h"
+
+ENTRY(arch_rethook_trampoline)
+	addi sp, sp, -(PT_SIZE_ON_STACK)
+	save_all_base_regs
+
+	move a0, sp /* pt_regs */
+
+	call arch_rethook_trampoline_callback
+
+	/* use the result as the return-address */
+	move ra, a0
+
+	restore_all_base_regs
+	addi sp, sp, PT_SIZE_ON_STACK
+
+	ret
+ENDPROC(arch_rethook_trampoline)
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 55041d2f8..a21562c11 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -210,9 +210,23 @@ static nokprobe_inline unsigned long get_kretprobe_retaddr(struct kretprobe_inst
 {
 	return ri->node.ret_addr;
 }
+
+static nokprobe_inline
+unsigned long kretprobe_trampoline_handler(struct pt_regs *regs,
+					   void *frame_pointer)
+{
+	return 0;
+}
+
 #else
-extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
-				   struct pt_regs *regs);
+static nokprobe_inline void arch_prepare_kretprobe(struct kretprobe_instance *ri,
+				      struct pt_regs *regs)
+{
+	ri->ret_addr = (kprobe_opcode_t *)regs->ra;
+	ri->fp = NULL;
+	regs->ra = (unsigned long) &__kretprobe_trampoline;
+}
+
 void arch_kretprobe_fixup_return(struct pt_regs *regs,
 				 kprobe_opcode_t *correct_ret_addr);
 
-- 
2.27.0


^ permalink raw reply related	[flat|nested] 11+ messages in thread
* Re: [PATCH] rethook: add riscv rethook implementation.
@ 2022-09-22  6:32 Wangbinglei
  0 siblings, 0 replies; 11+ messages in thread
From: Wangbinglei @ 2022-09-22  6:32 UTC (permalink / raw)
  To: Conor Dooley
  Cc: paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org, l3b2w1@gmail.com

Thanks for your tips, I resended modified patch using another mail addr(l3b2w1@gmail.com).

-----邮件原件-----
发件人: Conor Dooley [mailto:conor.dooley@microchip.com]
发送时间: 2022年9月20日 18:32
收件人: wangbinglei (RD) <wang.binglei@h3c.com>
抄送: paul.walmsley@sifive.com; palmer@dabbelt.com; aou@eecs.berkeley.edu; linux-riscv@lists.infradead.org; linux-kernel@vger.kernel.org; l3b2w1@gmail.com
主题: Re: [PATCH] rethook: add riscv rethook implementation.

On Tue, Sep 20, 2022 at 05:36:30PM +0800, Binglei Wang wrote:
> From: "wang.binglei" <wang.binglei@h3c.com>
>
> Most of the code copied from
> arch/riscv/kernel/probes/kprobes_trampoline.S

Hey Wang Binglei,

Please use the commit log to explain the reasons behind the change you
are making:
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes

>
> Signed-off-by: wang.binglei <wang.binglei@h3c.com>

Unfortunately I don't know much about Asian naming, but I assume that
the . is not part of your name?

> diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
> index e6e950b7c..2c1847921 100644
> --- a/arch/riscv/kernel/probes/kprobes.c
> +++ b/arch/riscv/kernel/probes/kprobes.c
> @@ -345,6 +345,7 @@ int __init arch_populate_kprobe_blacklist(void)
>         return ret;
>  }
>
> +#ifndef CONFIG_KRETPROBE_ON_RETHOOK

This seems quite unusual, other archs don't seem to have ifdef-ery
using CONFIG_KRETPROBE_ON_RETHOOK in their arch code so why should
RISC-V?

>  void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
>  {
>         return (void *)kretprobe_trampoline_handler(regs, NULL);
> @@ -357,6 +358,12 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
>         ri->fp = NULL;
>         regs->ra = (unsigned long) &__kretprobe_trampoline;
>  }
> +#else
> +void __kprobes *trampoline_probe_handler(struct pt_regs *regs)
> +{
> +       return NULL;
> +}
> +#endif


> diff --git a/arch/riscv/kernel/probes/rethook_trampoline.S b/arch/riscv/kernel/probes/rethook_trampoline.S
> new file mode 100644
> index 000000000..aa79630ac
> --- /dev/null
> +++ b/arch/riscv/kernel/probes/rethook_trampoline.S
> @@ -0,0 +1,94 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * rethook trampoline.
> + * Copied from arch/riscv/kernel/probes/kprobes_trampoline.S

Is this a 1:1 copy? If so, could the code be shared?

> This e-mail and its attachments contain confidential information from New H3C, which is
> intended only for the person or entity whose address is listed above. Any use of the
> information contained herein in any way (including, but not limited to, total or partial
> disclosure, reproduction, or dissemination) by persons other than the intended
> recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender
> by phone or email immediately and delete it!

Uh-oh! You'll have to work with your IT to get this removed before your
patches can be accepted:
https://lore.kernel.org/all/YgEnxmD9ZE4jVhP5@kroah.com/

The patch does not apply to -next for me either..

Thanks,
Conor.

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^ permalink raw reply	[flat|nested] 11+ messages in thread
* [PATCH] rethook: add riscv rethook implementation.
@ 2022-09-20  9:36 Binglei Wang
  2022-09-20 10:32 ` Conor Dooley
  0 siblings, 1 reply; 11+ messages in thread
From: Binglei Wang @ 2022-09-20  9:36 UTC (permalink / raw)
  To: paul.walmsley
  Cc: palmer, aou, linux-riscv, linux-kernel, l3b2w1, wang.binglei

From: "wang.binglei" <wang.binglei@h3c.com>

Most of the code copied from
arch/riscv/kernel/probes/kprobes_trampoline.S

Signed-off-by: wang.binglei <wang.binglei@h3c.com>
---
 arch/riscv/Kconfig                            |  1 +
 arch/riscv/kernel/probes/Makefile             |  1 +
 arch/riscv/kernel/probes/kprobes.c            |  7 ++
 arch/riscv/kernel/probes/rethook.c            | 24 +++++
 arch/riscv/kernel/probes/rethook_trampoline.S | 94 +++++++++++++++++++
 5 files changed, 127 insertions(+)
 create mode 100644 arch/riscv/kernel/probes/rethook.c
 create mode 100644 arch/riscv/kernel/probes/rethook_trampoline.S

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index ed66c31e4..c5cae0825 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -97,6 +97,7 @@ config RISCV
        select HAVE_KPROBES if !XIP_KERNEL
        select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
        select HAVE_KRETPROBES if !XIP_KERNEL
+       select HAVE_RETHOOK if !XIP_KERNEL
        select HAVE_MOVE_PMD
        select HAVE_MOVE_PUD
        select HAVE_PCI
diff --git a/arch/riscv/kernel/probes/Makefile b/arch/riscv/kernel/probes/Makefile
index 7f0840dcc..ee345e7e9 100644
--- a/arch/riscv/kernel/probes/Makefile
+++ b/arch/riscv/kernel/probes/Makefile
@@ -3,4 +3,5 @@ obj-$(CONFIG_KPROBES)           += kprobes.o decode-insn.o simulate-insn.o
 obj-$(CONFIG_KPROBES)          += kprobes_trampoline.o
 obj-$(CONFIG_KPROBES_ON_FTRACE)        += ftrace.o
 obj-$(CONFIG_UPROBES)          += uprobes.o decode-insn.o simulate-insn.o
+obj-$(CONFIG_RETHOOK)          += rethook.o rethook_trampoline.o
 CFLAGS_REMOVE_simulate-insn.o = $(CC_FLAGS_FTRACE)
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
index e6e950b7c..2c1847921 100644
--- a/arch/riscv/kernel/probes/kprobes.c
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -345,6 +345,7 @@ int __init arch_populate_kprobe_blacklist(void)
        return ret;
 }

+#ifndef CONFIG_KRETPROBE_ON_RETHOOK
 void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
 {
        return (void *)kretprobe_trampoline_handler(regs, NULL);
@@ -357,6 +358,12 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
        ri->fp = NULL;
        regs->ra = (unsigned long) &__kretprobe_trampoline;
 }
+#else
+void __kprobes *trampoline_probe_handler(struct pt_regs *regs)
+{
+       return NULL;
+}
+#endif

 int __kprobes arch_trampoline_kprobe(struct kprobe *p)
 {
diff --git a/arch/riscv/kernel/probes/rethook.c b/arch/riscv/kernel/probes/rethook.c
new file mode 100644
index 000000000..47853bc36
--- /dev/null
+++ b/arch/riscv/kernel/probes/rethook.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic return hook for riscv.
+ */
+
+#include <linux/kprobes.h>
+#include <linux/rethook.h>
+
+/* This is called from arch_rethook_trampoline() */
+unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
+{
+       return rethook_trampoline_handler(regs, regs->s0);
+}
+NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
+
+void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
+{
+       rhn->ret_addr = regs->ra;
+       rhn->frame = regs->s0;
+
+       /* replace return addr with trampoline */
+       regs->ra = (u64)arch_rethook_trampoline;
+}
+NOKPROBE_SYMBOL(arch_rethook_prepare);
diff --git a/arch/riscv/kernel/probes/rethook_trampoline.S b/arch/riscv/kernel/probes/rethook_trampoline.S
new file mode 100644
index 000000000..aa79630ac
--- /dev/null
+++ b/arch/riscv/kernel/probes/rethook_trampoline.S
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * rethook trampoline.
+ * Copied from arch/riscv/kernel/probes/kprobes_trampoline.S
+ */
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+
+       .text
+       .altmacro
+
+       .macro save_all_base_regs
+       REG_S x1,  PT_RA(sp)
+       REG_S x3,  PT_GP(sp)
+       REG_S x4,  PT_TP(sp)
+       REG_S x5,  PT_T0(sp)
+       REG_S x6,  PT_T1(sp)
+       REG_S x7,  PT_T2(sp)
+       REG_S x8,  PT_S0(sp)
+       REG_S x9,  PT_S1(sp)
+       REG_S x10, PT_A0(sp)
+       REG_S x11, PT_A1(sp)
+       REG_S x12, PT_A2(sp)
+       REG_S x13, PT_A3(sp)
+       REG_S x14, PT_A4(sp)
+       REG_S x15, PT_A5(sp)
+       REG_S x16, PT_A6(sp)
+       REG_S x17, PT_A7(sp)
+       REG_S x18, PT_S2(sp)
+       REG_S x19, PT_S3(sp)
+       REG_S x20, PT_S4(sp)
+       REG_S x21, PT_S5(sp)
+       REG_S x22, PT_S6(sp)
+       REG_S x23, PT_S7(sp)
+       REG_S x24, PT_S8(sp)
+       REG_S x25, PT_S9(sp)
+       REG_S x26, PT_S10(sp)
+       REG_S x27, PT_S11(sp)
+       REG_S x28, PT_T3(sp)
+       REG_S x29, PT_T4(sp)
+       REG_S x30, PT_T5(sp)
+       REG_S x31, PT_T6(sp)
+       .endm
+
+       .macro restore_all_base_regs
+       REG_L x3,  PT_GP(sp)
+       REG_L x4,  PT_TP(sp)
+       REG_L x5,  PT_T0(sp)
+       REG_L x6,  PT_T1(sp)
+       REG_L x7,  PT_T2(sp)
+       REG_L x8,  PT_S0(sp)
+       REG_L x9,  PT_S1(sp)
+       REG_L x10, PT_A0(sp)
+       REG_L x11, PT_A1(sp)
+       REG_L x12, PT_A2(sp)
+       REG_L x13, PT_A3(sp)
+       REG_L x14, PT_A4(sp)
+       REG_L x15, PT_A5(sp)
+       REG_L x16, PT_A6(sp)
+       REG_L x17, PT_A7(sp)
+       REG_L x18, PT_S2(sp)
+       REG_L x19, PT_S3(sp)
+       REG_L x20, PT_S4(sp)
+       REG_L x21, PT_S5(sp)
+       REG_L x22, PT_S6(sp)
+       REG_L x23, PT_S7(sp)
+       REG_L x24, PT_S8(sp)
+       REG_L x25, PT_S9(sp)
+       REG_L x26, PT_S10(sp)
+       REG_L x27, PT_S11(sp)
+       REG_L x28, PT_T3(sp)
+       REG_L x29, PT_T4(sp)
+       REG_L x30, PT_T5(sp)
+       REG_L x31, PT_T6(sp)
+       .endm
+
+ENTRY(arch_rethook_trampoline)
+       addi sp, sp, -(PT_SIZE_ON_STACK)
+       save_all_base_regs
+
+       move a0, sp /* pt_regs */
+
+       call arch_rethook_trampoline_callback
+
+       /* use the result as the return-address */
+       move ra, a0
+
+       restore_all_base_regs
+       addi sp, sp, PT_SIZE_ON_STACK
+
+       ret
+ENDPROC(arch_rethook_trampoline)
--
2.17.1

-------------------------------------------------------------------------------------------------------------------------------------
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end of thread, other threads:[~2022-09-24  8:54 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-09-22  4:04 [PATCH] rethook: add riscv rethook implementation Binglei Wang
2022-09-22  8:40 ` kernel test robot
2022-09-22 10:23 ` kernel test robot
2022-09-22 11:19 ` Binglei Wang
2022-09-22 11:28   ` Conor Dooley
2022-09-22 13:44     ` [PATCH v4] " l3b2w1
2022-09-23 17:26       ` Conor Dooley
2022-09-24  8:54       ` Masami Hiramatsu
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2022-09-22  6:32 [PATCH] " Wangbinglei
2022-09-20  9:36 Binglei Wang
2022-09-20 10:32 ` Conor Dooley

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