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>

diff --git a/arch/avr32/include/uapi/asm/unistd.h b/arch/avr32/include/uapi/asm/unistd.h
index b60132b..60c0f3a 100644 (file)
--- 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 f9c68fa..cb39915 100644 (file)
--- 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 1915a44..64d71a7 100644 (file)
--- 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 */