avr32: wire up copy_file_range syscall

This patch wires up the new copy_file_range syscall on AVR32.

On AVR32, all parameters beyond the 5th are passed on the stack. System
calls don't use the stack -- they borrow a callee-saved register
instead. This means that syscalls that take 6 parameters must be called
through a stub that pushes the last parameter on the stack.

Signed-off-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>

3 files changed, 11 insertions, 0 deletions

diff --git a/arch/avr32/include/uapi/asm/unistd.h b/arch/avr32/include/uapi/asm/unistd.h
index b60132bb27ea..60c0f3afc1f9 100644
--- a/arch/avr32/include/uapi/asm/unistd.h
+++ b/arch/avr32/include/uapi/asm/unistd.h
@@ -337,5 +337,6 @@
 #define __NR_userfaultfd        322
 #define __NR_membarrier         323
 #define __NR_mlock2             324
+#define __NR_copy_file_range    325
 
 #endif /* _UAPI__ASM_AVR32_UNISTD_H */
diff --git a/arch/avr32/kernel/syscall-stubs.S b/arch/avr32/kernel/syscall-stubs.S
index f9c68fab0e2f..cb3991552f14 100644
--- a/arch/avr32/kernel/syscall-stubs.S
+++ b/arch/avr32/kernel/syscall-stubs.S
@@ -124,3 +124,12 @@ __sys_process_vm_writev:
         call    sys_process_vm_writev
         sub     sp, -4
         popm    pc
+
+        .global __sys_copy_file_range
+        .type   __sys_copy_file_range,@function
+__sys_copy_file_range:
+        pushm   lr
+        st.w    --sp, ARG6
+        call    sys_copy_file_range
+        sub     sp, -4
+        popm    pc
diff --git a/arch/avr32/kernel/syscall_table.S b/arch/avr32/kernel/syscall_table.S
index 1915a443b491..64d71a781fa8 100644
--- a/arch/avr32/kernel/syscall_table.S
+++ b/arch/avr32/kernel/syscall_table.S
@@ -338,4 +338,5 @@ sys_call_table:
         .long   sys_userfaultfd
         .long   sys_membarrier
         .long   sys_mlock2
+        .long   __sys_copy_file_range   /* 325 */
         .long   sys_ni_syscall          /* r8 is saturated at nr_syscalls */