[PATCH 2/6] syscall.h: add syscall_set_arguments() on remaining HAVE_ARCH_TRACEHOOK arches

Dmitry V. Levin
2025-01-07T23:04:19Z

Add syscall_set_arguments() on those few HAVE_ARCH_TRACEHOOK
architectures that haven't provided it yet.

syscall_set_arguments() is going to be needed on all HAVE_ARCH_TRACEHOOK
architectures to implement PTRACE_SET_SYSCALL_INFO API.

Signed-off-by: Dmitry V. Levin <ldv@strace.io>
---
arch/arc/include/asm/syscall.h | 14 +++++++++
arch/arm/include/asm/syscall.h | 13 ++++++++
arch/arm64/include/asm/syscall.h | 13 ++++++++
arch/csky/include/asm/syscall.h | 13 ++++++++
arch/hexagon/include/asm/syscall.h | 7 +++++
arch/loongarch/include/asm/syscall.h | 8 +++++
arch/mips/include/asm/syscall.h | 46 ++++++++++++++++++++++++++++
arch/parisc/include/asm/syscall.h | 12 ++++++++
8 files changed, 126 insertions(+)

diff --git a/arch/arc/include/asm/syscall.h b/arch/arc/include/asm/syscall.h
index 9709256e31c8..89c1e1736356 100644
--- a/arch/arc/include/asm/syscall.h
+++ b/arch/arc/include/asm/syscall.h
@@ -67,6 +67,20 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
}
}

+static inline void
+syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *args)
+{
+ unsigned long *inside_ptregs = &regs->r0;
+ unsigned int n = 6;
+ unsigned int i = 0;
+
+ while (n--) {
+ *inside_ptregs = args[i++];
+ inside_ptregs--;
+ }
+}
+
static inline int
syscall_get_arch(struct task_struct *task)
{
diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
index fe4326d938c1..21927fa0ae2b 100644
--- a/arch/arm/include/asm/syscall.h
+++ b/arch/arm/include/asm/syscall.h
@@ -80,6 +80,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
}

+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(&regs->ARM_r0, args, 6 * sizeof(args[0]));
+ /*
+ * Also copy the first argument into ARM_ORIG_r0
+ * so that syscall_get_arguments() would return it
+ * instead of the previous value.
+ */
+ regs->ARM_ORIG_r0 = regs->ARM_r0;
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
/* ARM tasks don't change audit architectures on the fly. */
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
index ab8e14b96f68..76020b66286b 100644
--- a/arch/arm64/include/asm/syscall.h
+++ b/arch/arm64/include/asm/syscall.h
@@ -73,6 +73,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &regs->regs[1], 5 * sizeof(args[0]));
}

+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(&regs->regs[0], args, 6 * sizeof(args[0]));
+ /*
+ * Also copy the first argument into orig_x0
+ * so that syscall_get_arguments() would return it
+ * instead of the previous value.
+ */
+ regs->orig_x0 = regs->regs[0];
+}
+
/*
* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
* AArch64 has the same system calls both on little- and big- endian.
diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h
index 0de5734950bf..30403f7a0487 100644
--- a/arch/csky/include/asm/syscall.h
+++ b/arch/csky/include/asm/syscall.h
@@ -59,6 +59,19 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
memcpy(args, &regs->a1, 5 * sizeof(args[0]));
}

+static inline void
+syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(&regs->a0, args, 6 * sizeof(regs->a0));
+ /*
+ * Also copy the first argument into orig_x0
+ * so that syscall_get_arguments() would return it
+ * instead of the previous value.
+ */
+ regs->orig_a0 = regs->a0;
+}
+
static inline int
syscall_get_arch(struct task_struct *task)
{
diff --git a/arch/hexagon/include/asm/syscall.h b/arch/hexagon/include/asm/syscall.h
index f6e454f18038..12d2df6aaa03 100644
--- a/arch/hexagon/include/asm/syscall.h
+++ b/arch/hexagon/include/asm/syscall.h
@@ -33,6 +33,13 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &(&regs->r00)[0], 6 * sizeof(args[0]));
}

+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ memcpy(&(&regs->r00)[0], args, 6 * sizeof(args[0]));
+}
+
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
diff --git a/arch/loongarch/include/asm/syscall.h b/arch/loongarch/include/asm/syscall.h
index e286dc58476e..ff415b3c0a8e 100644
--- a/arch/loongarch/include/asm/syscall.h
+++ b/arch/loongarch/include/asm/syscall.h
@@ -61,6 +61,14 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(&args[1], &regs->regs[5], 5 * sizeof(long));
}

+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ regs->orig_a0 = args[0];
+ memcpy(&regs->regs[5], &args[1], 5 * sizeof(long));
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_LOONGARCH64;
diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index ebdf4d910af2..b8a19e465bf4 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -90,6 +90,37 @@ static inline void mips_get_syscall_arg(unsigned long *arg,
unreachable();
}

+static inline void mips_set_syscall_arg(unsigned long *arg,
+ struct task_struct *task, struct pt_regs *regs, unsigned int n)
+{
+ unsigned long usp __maybe_unused = regs->regs[29];
+
+ switch (n) {
+ case 0: case 1: case 2: case 3:
+ regs->regs[4 + n] = *arg;
+
+ return;
+
+#ifdef CONFIG_32BIT
+ case 4: case 5: case 6: case 7:
+ put_user(*arg, (int *)usp + n);
+ return;
+#endif
+
+#ifdef CONFIG_64BIT
+ case 4: case 5: case 6: case 7:
+#ifdef CONFIG_MIPS32_O32
+ if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
+ put_user(*arg, (int *)usp + n);
+ else
+#endif
+ regs->regs[4 + n] = *arg;
+
+ return;
+#endif
+ }
+}
+
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
@@ -136,6 +167,21 @@ static inline void syscall_get_arguments(struct task_struct *task,
mips_get_syscall_arg(args++, task, regs, i++);
}

+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ unsigned int i = 0;
+ unsigned int n = 6;
+
+ /* O32 ABI syscall() */
+ if (mips_syscall_is_indirect(task, regs))
+ i++;
+
+ while (n--)
+ mips_set_syscall_arg(args++, task, regs, i++);
+}
+
extern const unsigned long sys_call_table[];
extern const unsigned long sys32_call_table[];
extern const unsigned long sysn32_call_table[];
diff --git a/arch/parisc/include/asm/syscall.h b/arch/parisc/include/asm/syscall.h
index 00b127a5e09b..b146d0ae4c77 100644
--- a/arch/parisc/include/asm/syscall.h
+++ b/arch/parisc/include/asm/syscall.h
@@ -29,6 +29,18 @@ static inline void syscall_get_arguments(struct task_struct *tsk,
args[0] = regs->gr[26];
}

+static inline void syscall_set_arguments(struct task_struct *tsk,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ regs->gr[21] = args[5];
+ regs->gr[22] = args[4];
+ regs->gr[23] = args[3];
+ regs->gr[24] = args[2];
+ regs->gr[25] = args[1];
+ regs->gr[26] = args[0];
+}
+
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{

--
ldv