sparc,sparc64: unify kernel/

o Move all files from sparc64/kernel/ to sparc/kernel
  - rename as appropriate
o Update sparc/Makefile to the changes
o Update sparc/kernel/Makefile to include the sparc64 files

NOTE: This commit changes link order on sparc64!

Link order had to change for either of sparc32 and sparc64.
And assuming sparc64 see more testing than sparc32 change link
order on sparc64 where issues will be caught faster.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 279 insertions, 0 deletions

diff --git a/arch/sparc/kernel/syscalls.S b/arch/sparc/kernel/syscalls.S
new file mode 100644
index 000000000000..7a6786a71363
--- /dev/null
+++ b/arch/sparc/kernel/syscalls.S
@@ -0,0 +1,279 @@
+	/* SunOS's execv() call only specifies the argv argument, the
+	 * environment settings are the same as the calling processes.
+	 */
+sys_execve:
+	sethi	%hi(sparc_execve), %g1
+	ba,pt	%xcc, execve_merge
+	 or	%g1, %lo(sparc_execve), %g1
+
+#ifdef CONFIG_COMPAT
+sunos_execv:
+	stx	%g0, [%sp + PTREGS_OFF + PT_V9_I2]
+sys32_execve:
+	sethi	%hi(sparc32_execve), %g1
+	or	%g1, %lo(sparc32_execve), %g1
+#endif
+
+execve_merge:
+	flushw
+	jmpl	%g1, %g0
+	 add	%sp, PTREGS_OFF, %o0
+
+	.align	32
+sys_pipe:
+	ba,pt	%xcc, sparc_pipe
+	 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
+sys_sigaltstack:
+	ba,pt	%xcc, do_sigaltstack
+	 add	%i6, STACK_BIAS, %o2
+#ifdef CONFIG_COMPAT
+sys32_sigstack:
+	ba,pt	%xcc, do_sys32_sigstack
+	 mov	%i6, %o2
+sys32_sigaltstack:
+	ba,pt	%xcc, do_sys32_sigaltstack
+	 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), %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_syscall
+ret_from_syscall:
+	/* Clear current_thread_info()->new_child, and
+	 * check performance counter stuff too.
+	 */
+	stb	%g0, [%g6 + TI_NEW_CHILD]
+	ldx	[%g6 + TI_FLAGS], %l0
+	call	schedule_tail
+	 mov	%g7, %o0
+	andcc	%l0, _TIF_PERFCTR, %g0
+	be,pt	%icc, 1f
+	 nop
+	ldx	[%g6 + TI_PCR], %o7
+	wr	%g0, %o7, %pcr
+
+	/* Blackbird errata workaround.  See commentary in
+	 * smp.c:smp_percpu_timer_interrupt() for more
+	 * information.
+	 */
+	ba,pt	%xcc, 99f
+	 nop
+
+	.align	64
+99:	wr	%g0, %g0, %pic
+	rd	%pic, %g0
+
+1:	ba,pt	%xcc, ret_sys_call
+	 ldx	[%sp + PTREGS_OFF + PT_V9_I0], %o0
+
+	.globl	sparc_exit
+	.type	sparc_exit,#function
+sparc_exit:
+	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
+	ba,pt	%xcc, sys_exit
+	 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, 2f
+	 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	%i5, 0, %o5				! IEU1
+	srl	%i2, 0, %o2				! IEU0	Group
+	andcc	%l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %g0
+	bne,pn	%icc, linux_syscall_trace32		! CTI
+	 mov	%i0, %l5				! IEU1
+	call	%l7					! CTI	Group brk forced
+	 srl	%i3, 0, %o3				! IEU0
+	ba,a,pt	%xcc, 3f
+
+	/* 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), %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
+	ldx	[%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
+	sra	%o0, 0, %o0
+	mov	%ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
+	sllx	%g2, 32, %g2
+
+	/* Check if force_successful_syscall_return()
+	 * was invoked.
+	 */
+	ldub	[%g6 + TI_SYS_NOERROR], %l2
+	brnz,a,pn %l2, 80f
+	 stb	%g0, [%g6 + TI_SYS_NOERROR]
+
+	cmp	%o0, -ERESTART_RESTARTBLOCK
+	bgeu,pn	%xcc, 1f
+	 andcc	%l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %l6
+80:
+	/* System call success, clear Carry condition code. */
+	andn	%g3, %g2, %g3
+	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:
+	/* System call failure, set Carry condition code.
+	 * Also, get abs(errno) to return to the process.
+	 */
+	andcc	%l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %l6	
+	sub	%g0, %o0, %o0
+	or	%g3, %g2, %g3
+	stx	%o0, [%sp + PTREGS_OFF + PT_V9_I0]
+	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]
+
+	b,pt	%xcc, rtrap
+	 stx	%l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
+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]