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authorHans-Christian Noren Egtvedt <egtvedt@samfundet.no>2016-05-29 21:11:53 +0200
committerHans-Christian Noren Egtvedt <egtvedt@samfundet.no>2016-07-29 11:55:57 +0200
commit389ce5a9616b5c2ae386a1fde7401762a4ed1b37 (patch)
tree9f89ef7dad5cdeb7bed996de6b1784b52de397ea /arch/avr32
parent523d939ef98fd712632d93a5a2b588e477a7565e (diff)
downloadlinux-389ce5a9616b5c2ae386a1fde7401762a4ed1b37.tar.gz
avr32: wire up preadv2 and pwritev2 syscalls
This patch wires up the new preadv2 and pwritev2 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>
Diffstat (limited to 'arch/avr32')
-rw-r--r--arch/avr32/include/uapi/asm/unistd.h2
-rw-r--r--arch/avr32/kernel/syscall-stubs.S18
-rw-r--r--arch/avr32/kernel/syscall_table.S2
3 files changed, 22 insertions, 0 deletions
diff --git a/arch/avr32/include/uapi/asm/unistd.h b/arch/avr32/include/uapi/asm/unistd.h
index 60c0f3a..d0c1f6d 100644
--- a/arch/avr32/include/uapi/asm/unistd.h
+++ b/arch/avr32/include/uapi/asm/unistd.h
@@ -338,5 +338,7 @@
#define __NR_membarrier 323
#define __NR_mlock2 324
#define __NR_copy_file_range 325
+#define __NR_preadv2 326
+#define __NR_pwritev2 327
#endif /* _UAPI__ASM_AVR32_UNISTD_H */
diff --git a/arch/avr32/kernel/syscall-stubs.S b/arch/avr32/kernel/syscall-stubs.S
index cb39915..cb25653 100644
--- a/arch/avr32/kernel/syscall-stubs.S
+++ b/arch/avr32/kernel/syscall-stubs.S
@@ -133,3 +133,21 @@ __sys_copy_file_range:
call sys_copy_file_range
sub sp, -4
popm pc
+
+ .global __sys_preadv2
+ .type __sys_preadv2,@function
+__sys_preadv2:
+ pushm lr
+ st.w --sp, ARG6
+ call sys_preadv2
+ sub sp, -4
+ popm pc
+
+ .global __sys_pwritev2
+ .type __sys_pwritev2,@function
+__sys_pwritev2:
+ pushm lr
+ st.w --sp, ARG6
+ call sys_pwritev2
+ sub sp, -4
+ popm pc
diff --git a/arch/avr32/kernel/syscall_table.S b/arch/avr32/kernel/syscall_table.S
index 64d71a7..0eaf94b 100644
--- a/arch/avr32/kernel/syscall_table.S
+++ b/arch/avr32/kernel/syscall_table.S
@@ -339,4 +339,6 @@ sys_call_table:
.long sys_membarrier
.long sys_mlock2
.long __sys_copy_file_range /* 325 */
+ .long __sys_preadv2
+ .long __sys_pwritev2
.long sys_ni_syscall /* r8 is saturated at nr_syscalls */