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linux/arch/sparc/kernel/syscalls.S
Dave Kleikamp 1535bd8adb sparc64: don't treat 64-bit syscall return codes as 32-bit 
When checking a system call return code for an error,
linux_sparc_syscall was sign-extending the lower 32-bit value and
comparing it to -ERESTART_RESTARTBLOCK. lseek can return valid return
codes whose lower 32-bits alone would indicate a failure (such as 4G-1).
Use the whole 64-bit value to check for errors. Only the 32-bit path
should sign extend the lower 32-bit value.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Bob Picco <bob.picco@oracle.com>
Acked-by: Allen Pais <allen.pais@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-17 15:54:52 -04:00

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6.7 KiB
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/* SunOS's execv() call only specifies the argv argument, the
* environment settings are the same as the calling processes.
*/
sys64_execve:
set sys_execve, %g1
jmpl %g1, %g0
flushw
#ifdef CONFIG_COMPAT
sunos_execv:
mov %g0, %o2
sys32_execve:
set compat_sys_execve, %g1
jmpl %g1, %g0
flushw
#endif
.align 32
sys_sparc_pipe:
ba,pt %xcc, sys_sparc_pipe_real
add %sp, PTREGS_OFF, %o0
sys_nis_syscall:
ba,pt %xcc, c_sys_nis_syscall
add %sp, PTREGS_OFF, %o0
sys_memory_ordering:
ba,pt %xcc, sparc_memory_ordering
add %sp, PTREGS_OFF, %o1
#ifdef CONFIG_COMPAT
sys32_sigstack:
ba,pt %xcc, do_sys32_sigstack
mov %i6, %o2
#endif
.align 32
#ifdef CONFIG_COMPAT
sys32_sigreturn:
add %sp, PTREGS_OFF, %o0
call do_sigreturn32
add %o7, 1f-.-4, %o7
nop
#endif
sys_rt_sigreturn:
add %sp, PTREGS_OFF, %o0
call do_rt_sigreturn
add %o7, 1f-.-4, %o7
nop
#ifdef CONFIG_COMPAT
sys32_rt_sigreturn:
add %sp, PTREGS_OFF, %o0
call do_rt_sigreturn32
add %o7, 1f-.-4, %o7
nop
#endif
.align 32
1: ldx [%g6 + TI_FLAGS], %l5
andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
be,pt %icc, rtrap
nop
call syscall_trace_leave
add %sp, PTREGS_OFF, %o0
ba,pt %xcc, rtrap
nop
/* This is how fork() was meant to be done, 8 instruction entry.
*
* I questioned the following code briefly, let me clear things
* up so you must not reason on it like I did.
*
* Know the fork_kpsr etc. we use in the sparc32 port? We don't
* need it here because the only piece of window state we copy to
* the child is the CWP register. Even if the parent sleeps,
* we are safe because we stuck it into pt_regs of the parent
* so it will not change.
*
* XXX This raises the question, whether we can do the same on
* XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The
* XXX answer is yes. We stick fork_kpsr in UREG_G0 and
* XXX fork_kwim in UREG_G1 (global registers are considered
* XXX volatile across a system call in the sparc ABI I think
* XXX if it isn't we can use regs->y instead, anyone who depends
* XXX upon the Y register being preserved across a fork deserves
* XXX to lose).
*
* In fact we should take advantage of that fact for other things
* during system calls...
*/
.align 32
sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */
sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
ba,pt %xcc, sys_clone
sys_fork:
clr %o1
mov SIGCHLD, %o0
sys_clone:
flushw
movrz %o1, %fp, %o1
mov 0, %o3
ba,pt %xcc, sparc_do_fork
add %sp, PTREGS_OFF, %o2
.globl ret_from_fork
ret_from_fork:
/* Clear current_thread_info()->new_child. */
stb %g0, [%g6 + TI_NEW_CHILD]
call schedule_tail
mov %g7, %o0
ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0
brnz,pt %o0, ret_sys_call
ldx [%g6 + TI_FLAGS], %l0
ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1
call %l1
ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0
ba,pt %xcc, ret_sys_call
mov 0, %o0
.globl sparc_exit_group
.type sparc_exit_group,#function
sparc_exit_group:
sethi %hi(sys_exit_group), %g7
ba,pt %xcc, 1f
or %g7, %lo(sys_exit_group), %g7
.size sparc_exit_group,.-sparc_exit_group
.globl sparc_exit
.type sparc_exit,#function
sparc_exit:
sethi %hi(sys_exit), %g7
or %g7, %lo(sys_exit), %g7
1: rdpr %pstate, %g2
wrpr %g2, PSTATE_IE, %pstate
rdpr %otherwin, %g1
rdpr %cansave, %g3
add %g3, %g1, %g3
wrpr %g3, 0x0, %cansave
wrpr %g0, 0x0, %otherwin
wrpr %g2, 0x0, %pstate
jmpl %g7, %g0
stb %g0, [%g6 + TI_WSAVED]
.size sparc_exit,.-sparc_exit
linux_sparc_ni_syscall:
sethi %hi(sys_ni_syscall), %l7
ba,pt %xcc, 4f
or %l7, %lo(sys_ni_syscall), %l7
linux_syscall_trace32:
call syscall_trace_enter
add %sp, PTREGS_OFF, %o0
brnz,pn %o0, 3f
mov -ENOSYS, %o0
srl %i0, 0, %o0
srl %i4, 0, %o4
srl %i1, 0, %o1
srl %i2, 0, %o2
ba,pt %xcc, 5f
srl %i3, 0, %o3
linux_syscall_trace:
call syscall_trace_enter
add %sp, PTREGS_OFF, %o0
brnz,pn %o0, 3f
mov -ENOSYS, %o0
mov %i0, %o0
mov %i1, %o1
mov %i2, %o2
mov %i3, %o3
b,pt %xcc, 2f
mov %i4, %o4
/* Linux 32-bit system calls enter here... */
.align 32
.globl linux_sparc_syscall32
linux_sparc_syscall32:
/* Direct access to user regs, much faster. */
cmp %g1, NR_syscalls ! IEU1 Group
bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI
srl %i0, 0, %o0 ! IEU0
sll %g1, 2, %l4 ! IEU0 Group
srl %i4, 0, %o4 ! IEU1
lduw [%l7 + %l4], %l7 ! Load
srl %i1, 0, %o1 ! IEU0 Group
ldx [%g6 + TI_FLAGS], %l0 ! Load
srl %i3, 0, %o3 ! IEU0
srl %i2, 0, %o2 ! IEU0 Group
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
bne,pn %icc, linux_syscall_trace32 ! CTI
mov %i0, %l5 ! IEU1
5: call %l7 ! CTI Group brk forced
srl %i5, 0, %o5 ! IEU1
ba,pt %xcc, 3f
sra %o0, 0, %o0
/* Linux native system calls enter here... */
.align 32
.globl linux_sparc_syscall
linux_sparc_syscall:
/* Direct access to user regs, much faster. */
cmp %g1, NR_syscalls ! IEU1 Group
bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI
mov %i0, %o0 ! IEU0
sll %g1, 2, %l4 ! IEU0 Group
mov %i1, %o1 ! IEU1
lduw [%l7 + %l4], %l7 ! Load
4: mov %i2, %o2 ! IEU0 Group
ldx [%g6 + TI_FLAGS], %l0 ! Load
mov %i3, %o3 ! IEU1
mov %i4, %o4 ! IEU0 Group
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
bne,pn %icc, linux_syscall_trace ! CTI Group
mov %i0, %l5 ! IEU0
2: call %l7 ! CTI Group brk forced
mov %i5, %o5 ! IEU0
nop
3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
ret_sys_call:
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
sllx %g2, 32, %g2
cmp %o0, -ERESTART_RESTARTBLOCK
bgeu,pn %xcc, 1f
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
2:
/* System call success, clear Carry condition code. */
andn %g3, %g2, %g3
3:
stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE]
bne,pn %icc, linux_syscall_trace2
add %l1, 0x4, %l2 ! npc = npc+4
stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
ba,pt %xcc, rtrap
stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
1:
/* Check if force_successful_syscall_return()
* was invoked.
*/
ldub [%g6 + TI_SYS_NOERROR], %l2
brnz,pn %l2, 2b
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
/* System call failure, set Carry condition code.
* Also, get abs(errno) to return to the process.
*/
sub %g0, %o0, %o0
stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
ba,pt %xcc, 3b
or %g3, %g2, %g3
linux_syscall_trace2:
call syscall_trace_leave
add %sp, PTREGS_OFF, %o0
stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
ba,pt %xcc, rtrap
stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
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