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linux/arch/sparc/kernel/sys32.S
Catalin Marinas 8f9c0119d7 compat: fs: Generic compat_sys_sendfile implementation 
This function is used by sparc, powerpc and arm64 for compat support.
The patch adds a generic implementation which calls do_sendfile()
directly and avoids set_fs().

The sparc architecture has wrappers for the sign extensions while
powerpc relies on the compiler to do the this. The patch adds wrappers
for powerpc to handle the u32->int type conversion.

compat_sys_sendfile64() can be replaced by a sys_sendfile() call since
compat_loff_t has the same size as off_t on a 64-bit system.

On powerpc, the patch also changes the 64-bit sendfile call from
sys_sendile64 to sys_sendfile.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-02 21:35:55 -04:00

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/*
* sys32.S: I-cache tricks for 32-bit compatibility layer simple
* conversions.
*
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
*/
#include <asm/errno.h>
/* NOTE: call as jump breaks return stack, we have to avoid that */
.text
#define SIGN1(STUB,SYSCALL,REG1) \
.align 32; \
.globl STUB; \
STUB: sethi %hi(SYSCALL), %g1; \
jmpl %g1 + %lo(SYSCALL), %g0; \
sra REG1, 0, REG1
#define SIGN2(STUB,SYSCALL,REG1,REG2) \
.align 32; \
.globl STUB; \
STUB: sethi %hi(SYSCALL), %g1; \
sra REG1, 0, REG1; \
jmpl %g1 + %lo(SYSCALL), %g0; \
sra REG2, 0, REG2
#define SIGN3(STUB,SYSCALL,REG1,REG2,REG3) \
.align 32; \
.globl STUB; \
STUB: sra REG1, 0, REG1; \
sethi %hi(SYSCALL), %g1; \
sra REG2, 0, REG2; \
jmpl %g1 + %lo(SYSCALL), %g0; \
sra REG3, 0, REG3
#define SIGN4(STUB,SYSCALL,REG1,REG2,REG3,REG4) \
.align 32; \
.globl STUB; \
STUB: sra REG1, 0, REG1; \
sethi %hi(SYSCALL), %g1; \
sra REG2, 0, REG2; \
sra REG3, 0, REG3; \
jmpl %g1 + %lo(SYSCALL), %g0; \
sra REG4, 0, REG4
SIGN1(sys32_exit, sparc_exit, %o0)
SIGN1(sys32_exit_group, sys_exit_group, %o0)
SIGN1(sys32_wait4, compat_sys_wait4, %o2)
SIGN1(sys32_creat, sys_creat, %o1)
SIGN1(sys32_mknod, sys_mknod, %o1)
SIGN1(sys32_umount, sys_umount, %o1)
SIGN1(sys32_signal, sys_signal, %o0)
SIGN1(sys32_access, sys_access, %o1)
SIGN1(sys32_msync, sys_msync, %o2)
SIGN2(sys32_reboot, sys_reboot, %o0, %o1)
SIGN1(sys32_setitimer, compat_sys_setitimer, %o0)
SIGN1(sys32_getitimer, compat_sys_getitimer, %o0)
SIGN1(sys32_sethostname, sys_sethostname, %o1)
SIGN1(sys32_swapon, sys_swapon, %o1)
SIGN1(sys32_sigaction, compat_sys_sigaction, %o0)
SIGN1(sys32_rt_sigaction, compat_sys_rt_sigaction, %o0)
SIGN1(sys32_sigprocmask, compat_sys_sigprocmask, %o0)
SIGN1(sys32_rt_sigprocmask, compat_sys_rt_sigprocmask, %o0)
SIGN2(sys32_rt_sigqueueinfo, compat_sys_rt_sigqueueinfo, %o0, %o1)
SIGN1(sys32_getrusage, compat_sys_getrusage, %o0)
SIGN1(sys32_setxattr, sys_setxattr, %o4)
SIGN1(sys32_lsetxattr, sys_lsetxattr, %o4)
SIGN1(sys32_fsetxattr, sys_fsetxattr, %o4)
SIGN1(sys32_fgetxattr, sys_fgetxattr, %o0)
SIGN1(sys32_flistxattr, sys_flistxattr, %o0)
SIGN1(sys32_fremovexattr, sys_fremovexattr, %o0)
SIGN2(sys32_tkill, sys_tkill, %o0, %o1)
SIGN1(sys32_epoll_create, sys_epoll_create, %o0)
SIGN3(sys32_epoll_ctl, sys_epoll_ctl, %o0, %o1, %o2)
SIGN3(sys32_epoll_wait, sys_epoll_wait, %o0, %o2, %o3)
SIGN1(sys32_readahead, compat_sys_readahead, %o0)
SIGN2(sys32_fadvise64, compat_sys_fadvise64, %o0, %o4)
SIGN2(sys32_fadvise64_64, compat_sys_fadvise64_64, %o0, %o5)
SIGN2(sys32_bdflush, sys_bdflush, %o0, %o1)
SIGN1(sys32_mlockall, sys_mlockall, %o0)
SIGN1(sys32_clock_nanosleep, compat_sys_clock_nanosleep, %o1)
SIGN1(sys32_timer_settime, compat_sys_timer_settime, %o1)
SIGN1(sys32_io_submit, compat_sys_io_submit, %o1)
SIGN1(sys32_mq_open, compat_sys_mq_open, %o1)
SIGN1(sys32_select, compat_sys_select, %o0)
SIGN1(sys32_mkdir, sys_mkdir, %o1)
SIGN3(sys32_futex, compat_sys_futex, %o1, %o2, %o5)
SIGN1(sys32_sysfs, compat_sys_sysfs, %o0)
SIGN2(sys32_sendfile, compat_sys_sendfile, %o0, %o1)
SIGN2(sys32_sendfile64, sys_sendfile, %o0, %o1)
SIGN1(sys32_prctl, sys_prctl, %o0)
SIGN1(sys32_sched_rr_get_interval, compat_sys_sched_rr_get_interval, %o0)
SIGN2(sys32_waitpid, sys_waitpid, %o0, %o2)
SIGN1(sys32_getgroups, sys_getgroups, %o0)
SIGN1(sys32_getpgid, sys_getpgid, %o0)
SIGN2(sys32_getpriority, sys_getpriority, %o0, %o1)
SIGN1(sys32_getsid, sys_getsid, %o0)
SIGN2(sys32_kill, sys_kill, %o0, %o1)
SIGN1(sys32_nice, sys_nice, %o0)
SIGN1(sys32_lseek, sys_lseek, %o1)
SIGN2(sys32_open, sparc32_open, %o1, %o2)
SIGN1(sys32_readlink, sys_readlink, %o2)
SIGN1(sys32_sched_get_priority_max, sys_sched_get_priority_max, %o0)
SIGN1(sys32_sched_get_priority_min, sys_sched_get_priority_min, %o0)
SIGN1(sys32_sched_getparam, sys_sched_getparam, %o0)
SIGN1(sys32_sched_getscheduler, sys_sched_getscheduler, %o0)
SIGN1(sys32_sched_setparam, sys_sched_setparam, %o0)
SIGN2(sys32_sched_setscheduler, sys_sched_setscheduler, %o0, %o1)
SIGN1(sys32_getdomainname, sys_getdomainname, %o1)
SIGN1(sys32_setdomainname, sys_setdomainname, %o1)
SIGN1(sys32_setgroups, sys_setgroups, %o0)
SIGN2(sys32_setpgid, sys_setpgid, %o0, %o1)
SIGN3(sys32_setpriority, sys_setpriority, %o0, %o1, %o2)
SIGN1(sys32_ssetmask, sys_ssetmask, %o0)
SIGN2(sys32_syslog, sys_syslog, %o0, %o2)
SIGN1(sys32_umask, sys_umask, %o0)
SIGN3(sys32_tgkill, sys_tgkill, %o0, %o1, %o2)
SIGN1(sys32_sendto, sys_sendto, %o0)
SIGN1(sys32_recvfrom, compat_sys_recvfrom, %o0)
SIGN3(sys32_socket, sys_socket, %o0, %o1, %o2)
SIGN2(sys32_connect, sys_connect, %o0, %o2)
SIGN2(sys32_bind, sys_bind, %o0, %o2)
SIGN2(sys32_listen, sys_listen, %o0, %o1)
SIGN1(sys32_recvmsg, compat_sys_recvmsg, %o0)
SIGN1(sys32_sendmsg, compat_sys_sendmsg, %o0)
SIGN2(sys32_shutdown, sys_shutdown, %o0, %o1)
SIGN3(sys32_socketpair, sys_socketpair, %o0, %o1, %o2)
SIGN1(sys32_getpeername, sys_getpeername, %o0)
SIGN1(sys32_getsockname, sys_getsockname, %o0)
SIGN2(sys32_ioprio_get, sys_ioprio_get, %o0, %o1)
SIGN3(sys32_ioprio_set, sys_ioprio_set, %o0, %o1, %o2)
SIGN2(sys32_splice, sys_splice, %o0, %o2)
SIGN2(sys32_sync_file_range, compat_sync_file_range, %o0, %o5)
SIGN2(sys32_tee, sys_tee, %o0, %o1)
SIGN1(sys32_vmsplice, compat_sys_vmsplice, %o0)
SIGN1(sys32_truncate, sys_truncate, %o1)
SIGN1(sys32_ftruncate, sys_ftruncate, %o1)
.globl sys32_mmap2
sys32_mmap2:
sethi %hi(sys_mmap), %g1
jmpl %g1 + %lo(sys_mmap), %g0
sllx %o5, 12, %o5
.align 32
.globl sys32_socketcall
sys32_socketcall: /* %o0=call, %o1=args */
cmp %o0, 1
bl,pn %xcc, do_einval
cmp %o0, 18
bg,pn %xcc, do_einval
sub %o0, 1, %o0
sllx %o0, 5, %o0
sethi %hi(__socketcall_table_begin), %g2
or %g2, %lo(__socketcall_table_begin), %g2
jmpl %g2 + %o0, %g0
nop
do_einval:
retl
mov -EINVAL, %o0
.align 32
__socketcall_table_begin:
/* Each entry is exactly 32 bytes. */
do_sys_socket: /* sys_socket(int, int, int) */
1: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_socket), %g1
2: ldswa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(sys_socket), %g0
3: ldswa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_bind: /* sys_bind(int fd, struct sockaddr *, int) */
4: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_bind), %g1
5: ldswa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(sys_bind), %g0
6: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_connect: /* sys_connect(int, struct sockaddr *, int) */
7: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_connect), %g1
8: ldswa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(sys_connect), %g0
9: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_listen: /* sys_listen(int, int) */
10: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_listen), %g1
jmpl %g1 + %lo(sys_listen), %g0
11: ldswa [%o1 + 0x4] %asi, %o1
nop
nop
nop
nop
do_sys_accept: /* sys_accept(int, struct sockaddr *, int *) */
12: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_accept), %g1
13: lduwa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(sys_accept), %g0
14: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_getsockname: /* sys_getsockname(int, struct sockaddr *, int *) */
15: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_getsockname), %g1
16: lduwa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(sys_getsockname), %g0
17: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_getpeername: /* sys_getpeername(int, struct sockaddr *, int *) */
18: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_getpeername), %g1
19: lduwa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(sys_getpeername), %g0
20: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_socketpair: /* sys_socketpair(int, int, int, int *) */
21: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_socketpair), %g1
22: ldswa [%o1 + 0x8] %asi, %o2
23: lduwa [%o1 + 0xc] %asi, %o3
jmpl %g1 + %lo(sys_socketpair), %g0
24: ldswa [%o1 + 0x4] %asi, %o1
nop
nop
do_sys_send: /* sys_send(int, void *, size_t, unsigned int) */
25: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_send), %g1
26: lduwa [%o1 + 0x8] %asi, %o2
27: lduwa [%o1 + 0xc] %asi, %o3
jmpl %g1 + %lo(sys_send), %g0
28: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
do_sys_recv: /* sys_recv(int, void *, size_t, unsigned int) */
29: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_recv), %g1
30: lduwa [%o1 + 0x8] %asi, %o2
31: lduwa [%o1 + 0xc] %asi, %o3
jmpl %g1 + %lo(sys_recv), %g0
32: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
do_sys_sendto: /* sys_sendto(int, u32, compat_size_t, unsigned int, u32, int) */
33: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_sendto), %g1
34: lduwa [%o1 + 0x8] %asi, %o2
35: lduwa [%o1 + 0xc] %asi, %o3
36: lduwa [%o1 + 0x10] %asi, %o4
37: ldswa [%o1 + 0x14] %asi, %o5
jmpl %g1 + %lo(sys_sendto), %g0
38: lduwa [%o1 + 0x4] %asi, %o1
do_sys_recvfrom: /* sys_recvfrom(int, u32, compat_size_t, unsigned int, u32, u32) */
39: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_recvfrom), %g1
40: lduwa [%o1 + 0x8] %asi, %o2
41: lduwa [%o1 + 0xc] %asi, %o3
42: lduwa [%o1 + 0x10] %asi, %o4
43: lduwa [%o1 + 0x14] %asi, %o5
jmpl %g1 + %lo(sys_recvfrom), %g0
44: lduwa [%o1 + 0x4] %asi, %o1
do_sys_shutdown: /* sys_shutdown(int, int) */
45: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_shutdown), %g1
jmpl %g1 + %lo(sys_shutdown), %g0
46: ldswa [%o1 + 0x4] %asi, %o1
nop
nop
nop
nop
do_sys_setsockopt: /* compat_sys_setsockopt(int, int, int, char *, int) */
47: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(compat_sys_setsockopt), %g1
48: ldswa [%o1 + 0x8] %asi, %o2
49: lduwa [%o1 + 0xc] %asi, %o3
50: ldswa [%o1 + 0x10] %asi, %o4
jmpl %g1 + %lo(compat_sys_setsockopt), %g0
51: ldswa [%o1 + 0x4] %asi, %o1
nop
do_sys_getsockopt: /* compat_sys_getsockopt(int, int, int, u32, u32) */
52: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(compat_sys_getsockopt), %g1
53: ldswa [%o1 + 0x8] %asi, %o2
54: lduwa [%o1 + 0xc] %asi, %o3
55: lduwa [%o1 + 0x10] %asi, %o4
jmpl %g1 + %lo(compat_sys_getsockopt), %g0
56: ldswa [%o1 + 0x4] %asi, %o1
nop
do_sys_sendmsg: /* compat_sys_sendmsg(int, struct compat_msghdr *, unsigned int) */
57: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(compat_sys_sendmsg), %g1
58: lduwa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(compat_sys_sendmsg), %g0
59: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_recvmsg: /* compat_sys_recvmsg(int, struct compat_msghdr *, unsigned int) */
60: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(compat_sys_recvmsg), %g1
61: lduwa [%o1 + 0x8] %asi, %o2
jmpl %g1 + %lo(compat_sys_recvmsg), %g0
62: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
nop
do_sys_accept4: /* sys_accept4(int, struct sockaddr *, int *, int) */
63: ldswa [%o1 + 0x0] %asi, %o0
sethi %hi(sys_accept4), %g1
64: lduwa [%o1 + 0x8] %asi, %o2
65: ldswa [%o1 + 0xc] %asi, %o3
jmpl %g1 + %lo(sys_accept4), %g0
66: lduwa [%o1 + 0x4] %asi, %o1
nop
nop
.globl sys32_fanotify_mark
sys32_fanotify_mark:
sethi %hi(sys_fanotify_mark), %g1
sllx %o2, 32, %o2
or %o2, %o3, %o2
mov %o4, %o3
jmpl %g1 + %lo(sys_fanotify_mark), %g0
mov %o5, %o4
.section __ex_table,"a"
.align 4
.word 1b, __retl_efault, 2b, __retl_efault
.word 3b, __retl_efault, 4b, __retl_efault
.word 5b, __retl_efault, 6b, __retl_efault
.word 7b, __retl_efault, 8b, __retl_efault
.word 9b, __retl_efault, 10b, __retl_efault
.word 11b, __retl_efault, 12b, __retl_efault
.word 13b, __retl_efault, 14b, __retl_efault
.word 15b, __retl_efault, 16b, __retl_efault
.word 17b, __retl_efault, 18b, __retl_efault
.word 19b, __retl_efault, 20b, __retl_efault
.word 21b, __retl_efault, 22b, __retl_efault
.word 23b, __retl_efault, 24b, __retl_efault
.word 25b, __retl_efault, 26b, __retl_efault
.word 27b, __retl_efault, 28b, __retl_efault
.word 29b, __retl_efault, 30b, __retl_efault
.word 31b, __retl_efault, 32b, __retl_efault
.word 33b, __retl_efault, 34b, __retl_efault
.word 35b, __retl_efault, 36b, __retl_efault
.word 37b, __retl_efault, 38b, __retl_efault
.word 39b, __retl_efault, 40b, __retl_efault
.word 41b, __retl_efault, 42b, __retl_efault
.word 43b, __retl_efault, 44b, __retl_efault
.word 45b, __retl_efault, 46b, __retl_efault
.word 47b, __retl_efault, 48b, __retl_efault
.word 49b, __retl_efault, 50b, __retl_efault
.word 51b, __retl_efault, 52b, __retl_efault
.word 53b, __retl_efault, 54b, __retl_efault
.word 55b, __retl_efault, 56b, __retl_efault
.word 57b, __retl_efault, 58b, __retl_efault
.word 59b, __retl_efault, 60b, __retl_efault
.word 61b, __retl_efault, 62b, __retl_efault
.word 63b, __retl_efault, 64b, __retl_efault
.word 65b, __retl_efault, 66b, __retl_efault
.previous
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