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-rw-r--r--arch/sparc/kernel/syscalls.S298
1 files changed, 298 insertions, 0 deletions
diff --git a/arch/sparc/kernel/syscalls.S b/arch/sparc/kernel/syscalls.S
new file mode 100644
index 000000000..db42b4fb3
--- /dev/null
+++ b/arch/sparc/kernel/syscalls.S
@@ -0,0 +1,298 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+ /* 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
+
+sys64_execveat:
+ set sys_execveat, %g1
+ jmpl %g1, %g0
+ flushw
+
+#ifdef CONFIG_COMPAT
+sunos_execv:
+ mov %g0, %o2
+sys32_execve:
+ set compat_sys_execve, %g1
+ jmpl %g1, %g0
+ flushw
+
+sys32_execveat:
+ set compat_sys_execveat, %g1
+ jmpl %g1, %g0
+ flushw
+#endif
+
+ .align 32
+#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
+
+ /* Syscall tracing can modify the registers. */
+ ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
+ sethi %hi(sys_call_table32), %l7
+ ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
+ or %l7, %lo(sys_call_table32), %l7
+ ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
+ ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
+ ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
+ ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
+ ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
+
+ cmp %g1, NR_syscalls
+ bgeu,pn %xcc, 3f
+ mov -ENOSYS, %o0
+
+ sll %g1, 2, %l4
+ srl %i0, 0, %o0
+ lduw [%l7 + %l4], %l7
+ 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
+
+ /* Syscall tracing can modify the registers. */
+ ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
+ sethi %hi(sys_call_table64), %l7
+ ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
+ or %l7, %lo(sys_call_table64), %l7
+ ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
+ ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
+ ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
+ ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
+ ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
+
+ cmp %g1, NR_syscalls
+ bgeu,pn %xcc, 3f
+ mov -ENOSYS, %o0
+
+ sll %g1, 2, %l4
+ mov %i0, %o0
+ lduw [%l7 + %l4], %l7
+ 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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