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-rw-r--r--arch/mips/kernel/scall64-n32.S107
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
new file mode 100644
index 000000000..97456b2ca
--- /dev/null
+++ b/arch/mips/kernel/scall64-n32.S
@@ -0,0 +1,107 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01 by Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2001 MIPS Technologies, Inc.
+ */
+#include <linux/errno.h>
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/irqflags.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+
+#ifndef CONFIG_MIPS32_O32
+/* No O32, so define handle_sys here */
+#define handle_sysn32 handle_sys
+#endif
+
+ .align 5
+NESTED(handle_sysn32, PT_SIZE, sp)
+#ifndef CONFIG_MIPS32_O32
+ .set noat
+ SAVE_SOME
+ TRACE_IRQS_ON_RELOAD
+ STI
+ .set at
+#endif
+
+ dsubu t0, v0, __NR_N32_Linux # check syscall number
+ sltiu t0, t0, __NR_N32_Linux_syscalls
+
+#ifndef CONFIG_MIPS32_O32
+ ld t1, PT_EPC(sp) # skip syscall on return
+ daddiu t1, 4 # skip to next instruction
+ sd t1, PT_EPC(sp)
+#endif
+ beqz t0, not_n32_scall
+
+ sd a3, PT_R26(sp) # save a3 for syscall restarting
+
+ li t1, _TIF_WORK_SYSCALL_ENTRY
+ LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
+ and t0, t1, t0
+ bnez t0, n32_syscall_trace_entry
+
+syscall_common:
+ dsll t0, v0, 3 # offset into table
+ ld t2, (sysn32_call_table - (__NR_N32_Linux * 8))(t0)
+
+ jalr t2 # Do The Real Thing (TM)
+
+ li t0, -EMAXERRNO - 1 # error?
+ sltu t0, t0, v0
+ sd t0, PT_R7(sp) # set error flag
+ beqz t0, 1f
+
+ ld t1, PT_R2(sp) # syscall number
+ dnegu v0 # error
+ sd t1, PT_R0(sp) # save it for syscall restarting
+1: sd v0, PT_R2(sp) # result
+
+ j syscall_exit_partial
+
+/* ------------------------------------------------------------------------ */
+
+n32_syscall_trace_entry:
+ SAVE_STATIC
+ move a0, sp
+ move a1, v0
+ jal syscall_trace_enter
+
+ bltz v0, 1f # seccomp failed? Skip syscall
+
+ RESTORE_STATIC
+ ld v0, PT_R2(sp) # Restore syscall (maybe modified)
+ ld a0, PT_R4(sp) # Restore argument registers
+ ld a1, PT_R5(sp)
+ ld a2, PT_R6(sp)
+ ld a3, PT_R7(sp)
+ ld a4, PT_R8(sp)
+ ld a5, PT_R9(sp)
+
+ dsubu t2, v0, __NR_N32_Linux # check (new) syscall number
+ sltiu t0, t2, __NR_N32_Linux_syscalls
+ beqz t0, not_n32_scall
+
+ j syscall_common
+
+1: j syscall_exit
+
+not_n32_scall:
+ /* This is not an n32 compatibility syscall, pass it on to
+ the n64 syscall handlers. */
+ j handle_sys64
+
+ END(handle_sysn32)
+
+#define __SYSCALL(nr, entry) PTR_WD entry
+ .type sysn32_call_table, @object
+EXPORT(sysn32_call_table)
+#include <asm/syscall_table_n32.h>