arc: merge common start-up code between ARC and ARCv2

Even though ARCompact and ARCv2 are not binary compatible most of
assembly instructions are used in both. With this change we'll get rid
of duplicate code.

Still IVTs are implemented differently so we're keeping them in separate
files.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

7 files changed, 82 insertions, 294 deletions

diff --git a/arch/arc/cpu/arcv1/Makefile b/arch/arc/cpu/arcv1/Makefile
index 3704ebe..6d17ab2 100644
--- a/arch/arc/cpu/arcv1/Makefile
+++ b/arch/arc/cpu/arcv1/Makefile
@@ -4,4 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += start.o
+obj-y += ivt.o
diff --git a/arch/arc/cpu/arcv1/ivt.S b/arch/arc/cpu/arcv1/ivt.S
new file mode 100644
index 0000000..7df47a2
--- /dev/null
+++ b/arch/arc/cpu/arcv1/ivt.S
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+.section .ivt, "ax",@progbits
+.align 4
+_ivt:
+	/* Critical system events */
+	j	_start			/* 0 - 0x000 */
+	j	memory_error		/* 1 - 0x008 */
+	j	instruction_error	/* 2 - 0x010 */
+
+	/* Device interrupts */
+.rept	29
+	j	interrupt_handler	/* 3:31 - 0x018:0xF8 */
+.endr
+	/* Exceptions */
+	j	EV_MachineCheck		/* 0x100, Fatal Machine check  (0x20) */
+	j	EV_TLBMissI		/* 0x108, Intruction TLB miss  (0x21) */
+	j	EV_TLBMissD		/* 0x110, Data TLB miss        (0x22) */
+	j	EV_TLBProtV		/* 0x118, Protection Violation (0x23)
+							or Misaligned Access  */
+	j	EV_PrivilegeV		/* 0x120, Privilege Violation  (0x24) */
+	j	EV_Trap			/* 0x128, Trap exception       (0x25) */
+	j	EV_Extension		/* 0x130, Extn Intruction Excp (0x26) */
diff --git a/arch/arc/cpu/arcv2/Makefile b/arch/arc/cpu/arcv2/Makefile
index cc69e5a..e338a0a 100644
--- a/arch/arc/cpu/arcv2/Makefile
+++ b/arch/arc/cpu/arcv2/Makefile
@@ -4,4 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += start.o
+obj-y += ivt.o
diff --git a/arch/arc/cpu/arcv2/ivt.S b/arch/arc/cpu/arcv2/ivt.S
new file mode 100644
index 0000000..d110b5b
--- /dev/null
+++ b/arch/arc/cpu/arcv2/ivt.S
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2013-2015 Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+.section .ivt, "a",@progbits
+.align 4
+	/* Critical system events */
+.word	_start			/* 0 - 0x000 */
+.word	memory_error		/* 1 - 0x008 */
+.word	instruction_error	/* 2 - 0x010 */
+
+	/* Exceptions */
+.word	EV_MachineCheck		/* 0x100, Fatal Machine check  (0x20) */
+.word	EV_TLBMissI		/* 0x108, Intruction TLB miss  (0x21) */
+.word	EV_TLBMissD		/* 0x110, Data TLB miss        (0x22) */
+.word	EV_TLBProtV		/* 0x118, Protection Violation (0x23)
+							or Misaligned Access  */
+.word	EV_PrivilegeV		/* 0x120, Privilege Violation  (0x24) */
+.word	EV_Trap			/* 0x128, Trap exception       (0x25) */
+.word	EV_Extension		/* 0x130, Extn Intruction Excp (0x26) */
+
+	/* Device interrupts */
+.rept	29
+	j	interrupt_handler	/* 3:31 - 0x018:0xF8 */
+.endr
diff --git a/arch/arc/cpu/arcv2/start.S b/arch/arc/cpu/arcv2/start.S
deleted file mode 100644
index 3ce6896..0000000
--- a/arch/arc/cpu/arcv2/start.S
+++ /dev/null
@@ -1,254 +0,0 @@
-/*
- * Copyright (C) 2013-2015 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <asm-offsets.h>
-#include <config.h>
-#include <asm/arcregs.h>
-
-/*
- * Note on the LD/ST addressing modes with address register write-back
- *
- * LD.a same as LD.aw
- *
- * LD.a    reg1, [reg2, x]  => Pre Incr
- *      Eff Addr for load = [reg2 + x]
- *
- * LD.ab   reg1, [reg2, x]  => Post Incr
- *      Eff Addr for load = [reg2]
- */
-
-.macro PUSH reg
-	st.a	\reg, [%sp, -4]
-.endm
-
-.macro PUSHAX aux
-	lr	%r9, [\aux]
-	PUSH	%r9
-.endm
-
-.macro  SAVE_R1_TO_R24
-	PUSH	%r1
-	PUSH	%r2
-	PUSH	%r3
-	PUSH	%r4
-	PUSH	%r5
-	PUSH	%r6
-	PUSH	%r7
-	PUSH	%r8
-	PUSH	%r9
-	PUSH	%r10
-	PUSH	%r11
-	PUSH	%r12
-	PUSH	%r13
-	PUSH	%r14
-	PUSH	%r15
-	PUSH	%r16
-	PUSH	%r17
-	PUSH	%r18
-	PUSH	%r19
-	PUSH	%r20
-	PUSH	%r21
-	PUSH	%r22
-	PUSH	%r23
-	PUSH	%r24
-.endm
-
-.macro SAVE_ALL_SYS
-	/* saving %r0 to reg->r0 in advance since weread %ecr into it */
-	st	%r0, [%sp, -8]
-	lr	%r0, [%ecr]	/* all stack addressing is manual so far */
-	st	%r0, [%sp]
-	st	%sp, [%sp, -4]
-	/* now move %sp to reg->r0 position so we can do "push" automatically */
-	sub	%sp, %sp, 8
-
-	SAVE_R1_TO_R24
-	PUSH	%r25
-	PUSH	%gp
-	PUSH	%fp
-	PUSH	%blink
-	PUSHAX	%eret
-	PUSHAX	%erstatus
-	PUSH	%lp_count
-	PUSHAX	%lp_end
-	PUSHAX	%lp_start
-	PUSHAX	%erbta
-.endm
-
-.macro SAVE_EXCEPTION_SOURCE
-#ifdef CONFIG_MMU
-	/* If MMU exists exception faulting address is loaded in EFA reg */
-	lr	%r0, [%efa]
-#else
-	/* Otherwise in ERET (exception return) reg */
-	lr	%r0, [%eret]
-#endif
-.endm
-
-.section .ivt, "a",@progbits
-.align 4
-	/* Critical system events */
-.word	_start			/* 0 - 0x000 */
-.word	memory_error		/* 1 - 0x008 */
-.word	instruction_error	/* 2 - 0x010 */
-
-	/* Exceptions */
-.word	EV_MachineCheck		/* 0x100, Fatal Machine check  (0x20) */
-.word	EV_TLBMissI		/* 0x108, Intruction TLB miss  (0x21) */
-.word	EV_TLBMissD		/* 0x110, Data TLB miss        (0x22) */
-.word	EV_TLBProtV		/* 0x118, Protection Violation (0x23)
-							or Misaligned Access  */
-.word	EV_PrivilegeV		/* 0x120, Privilege Violation  (0x24) */
-.word	EV_Trap			/* 0x128, Trap exception       (0x25) */
-.word	EV_Extension		/* 0x130, Extn Intruction Excp (0x26) */
-
-	/* Device interrupts */
-.rept	29
-	j	interrupt_handler	/* 3:31 - 0x018:0xF8 */
-.endr
-
-.text
-.globl _start
-_start:
-	/* Setup interrupt vector base that matches "__text_start" */
-	sr	__ivt_start, [ARC_AUX_INTR_VEC_BASE]
-
-	/* Setup stack pointer */
-	mov	%sp, CONFIG_SYS_INIT_SP_ADDR
-	mov	%fp, %sp
-
-	/* Clear bss */
-	mov	%r0, __bss_start
-	mov	%r1, __bss_end
-
-clear_bss:
-	st.ab	0, [%r0, 4]
-	brlt	%r0, %r1, clear_bss
-
-	/* Zero the one and only argument of "board_init_f" */
-	mov_s	%r0, 0
-	j	board_init_f
-
-memory_error:
-	SAVE_ALL_SYS
-	SAVE_EXCEPTION_SOURCE
-	mov	%r1, %sp
-	j	do_memory_error
-
-instruction_error:
-	SAVE_ALL_SYS
-	SAVE_EXCEPTION_SOURCE
-	mov	%r1, %sp
-	j	do_instruction_error
-
-interrupt_handler:
-	/* Todo - save and restore CPU context when interrupts will be in use */
-	bl	do_interrupt_handler
-	rtie
-
-EV_MachineCheck:
-	SAVE_ALL_SYS
-	SAVE_EXCEPTION_SOURCE
-	mov	%r1, %sp
-	j	do_machine_check_fault
-
-EV_TLBMissI:
-	SAVE_ALL_SYS
-	mov	%r0, %sp
-	j	do_itlb_miss
-
-EV_TLBMissD:
-	SAVE_ALL_SYS
-	mov	%r0, %sp
-	j	do_dtlb_miss
-
-EV_TLBProtV:
-	SAVE_ALL_SYS
-	SAVE_EXCEPTION_SOURCE
-	mov	%r1, %sp
-	j	do_tlb_prot_violation
-
-EV_PrivilegeV:
-	SAVE_ALL_SYS
-	mov	%r0, %sp
-	j	do_privilege_violation
-
-EV_Trap:
-	SAVE_ALL_SYS
-	mov	%r0, %sp
-	j	do_trap
-
-EV_Extension:
-	SAVE_ALL_SYS
-	mov	%r0, %sp
-	j	do_extension
-
-/*
- * void relocate_code (addr_sp, gd, addr_moni)
- *
- * This "function" does not return, instead it continues in RAM
- * after relocating the monitor code.
- *
- * r0 = start_addr_sp
- * r1 = new__gd
- * r2 = relocaddr
- */
-.align 4
-.globl	relocate_code
-relocate_code:
-	/*
-	 * r0-r12 might be clobbered by C functions
-	 * so we use r13-r16 for storage here
-	 */
-	mov	%r13, %r0		/* save addr_sp */
-	mov	%r14, %r1		/* save addr of gd */
-	mov	%r15, %r2		/* save addr of destination */
-
-	mov	%r16, %r2		/* %r9 - relocation offset */
-	sub	%r16, %r16, __image_copy_start
-
-/* Set up the stack */
-stack_setup:
-	mov	%sp, %r13
-	mov	%fp, %sp
-
-/* Check if monitor is loaded right in place for relocation */
-	mov	%r0, __image_copy_start
-	cmp	%r0, %r15		/* skip relocation if code loaded */
-	bz	do_board_init_r		/* in target location already */
-
-/* Copy data (__image_copy_start - __image_copy_end) to new location */
-	mov	%r1, %r15
-	mov	%r2, __image_copy_end
-	sub	%r2, %r2, %r0		/* r3 <- amount of bytes to copy */
-	asr	%r2, %r2, 2		/* r3 <- amount of words to copy */
-	mov	%lp_count, %r2
-	lp	copy_end
-	ld.ab	%r2,[%r0,4]
-	st.ab	%r2,[%r1,4]
-copy_end:
-
-/* Fix relocations related issues */
-	bl	do_elf_reloc_fixups
-#ifndef CONFIG_SYS_ICACHE_OFF
-	bl	invalidate_icache_all
-#endif
-#ifndef CONFIG_SYS_DCACHE_OFF
-	bl	flush_dcache_all
-#endif
-
-/* Update position of intterupt vector table */
-	lr	%r0, [ARC_AUX_INTR_VEC_BASE]	/* Read current position */
-	add	%r0, %r0, %r16			/* Update address */
-	sr	%r0, [ARC_AUX_INTR_VEC_BASE]	/* Write new position */
-
-do_board_init_r:
-/* Prepare for exection of "board_init_r" in relocated monitor */
-	mov	%r2, board_init_r	/* old address of "board_init_r()" */
-	add	%r2, %r2, %r16		/* new address of "board_init_r()" */
-	mov	%r0, %r14		/* 1-st parameter: gd_t */
-	mov	%r1, %r15		/* 2-nd parameter: dest_addr */
-	j	[%r2]
diff --git a/arch/arc/lib/Makefile b/arch/arc/lib/Makefile
index b8028c9..ad66ac2 100644
--- a/arch/arc/lib/Makefile
+++ b/arch/arc/lib/Makefile
@@ -18,6 +18,7 @@ obj-y += memcpy-700.o
 obj-y += memset.o
 obj-y += reset.o
 obj-y += timer.o
+obj-y += start.o
 
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 
diff --git a/arch/arc/cpu/arcv1/start.S b/arch/arc/lib/start.S
index 01cfba4..39eace3 100644
--- a/arch/arc/cpu/arcv1/start.S
+++ b/arch/arc/lib/start.S
@@ -6,6 +6,7 @@
 
 #include <asm-offsets.h>
 #include <config.h>
+#include <linux/linkage.h>
 #include <asm/arcregs.h>
 
 /*
@@ -88,31 +89,7 @@
 #endif
 .endm
 
-.section .ivt, "ax",@progbits
-.align 4
-_ivt:
-	/* Critical system events */
-	j	_start			/* 0 - 0x000 */
-	j	memory_error		/* 1 - 0x008 */
-	j	instruction_error	/* 2 - 0x010 */
-
-	/* Device interrupts */
-.rept	29
-	j	interrupt_handler	/* 3:31 - 0x018:0xF8 */
-.endr
-	/* Exceptions */
-	j	EV_MachineCheck		/* 0x100, Fatal Machine check  (0x20) */
-	j	EV_TLBMissI		/* 0x108, Intruction TLB miss  (0x21) */
-	j	EV_TLBMissD		/* 0x110, Data TLB miss        (0x22) */
-	j	EV_TLBProtV		/* 0x118, Protection Violation (0x23)
-							or Misaligned Access  */
-	j	EV_PrivilegeV		/* 0x120, Privilege Violation  (0x24) */
-	j	EV_Trap			/* 0x128, Trap exception       (0x25) */
-	j	EV_Extension		/* 0x130, Extn Intruction Excp (0x26) */
-
-.text
-.globl _start
-_start:
+ENTRY(_start)
 	/* Setup interrupt vector base that matches "__text_start" */
 	sr	__ivt_start, [ARC_AUX_INTR_VEC_BASE]
 
@@ -131,60 +108,71 @@ clear_bss:
 	/* Zero the one and only argument of "board_init_f" */
 	mov_s	%r0, 0
 	j	board_init_f
+ENDPROC(_start)
 
-memory_error:
+ENTRY(memory_error)
 	SAVE_ALL_SYS
 	SAVE_EXCEPTION_SOURCE
 	mov	%r1, %sp
 	j	do_memory_error
+ENDPROC(memory_error)
 
-instruction_error:
+ENTRY(instruction_error)
 	SAVE_ALL_SYS
 	SAVE_EXCEPTION_SOURCE
 	mov	%r1, %sp
 	j	do_instruction_error
+ENDPROC(instruction_error)
 
-interrupt_handler:
+ENTRY(interrupt_handler)
 	/* Todo - save and restore CPU context when interrupts will be in use */
 	bl	do_interrupt_handler
 	rtie
+ENDPROC(interrupt_handler)
 
-EV_MachineCheck:
+ENTRY(EV_MachineCheck)
 	SAVE_ALL_SYS
 	SAVE_EXCEPTION_SOURCE
 	mov	%r1, %sp
 	j	do_machine_check_fault
+ENDPROC(EV_MachineCheck)
 
-EV_TLBMissI:
+ENTRY(EV_TLBMissI)
 	SAVE_ALL_SYS
 	mov	%r0, %sp
 	j	do_itlb_miss
+ENDPROC(EV_TLBMissI)
 
-EV_TLBMissD:
+ENTRY(EV_TLBMissD)
 	SAVE_ALL_SYS
 	mov	%r0, %sp
 	j	do_dtlb_miss
+ENDPROC(EV_TLBMissD)
 
-EV_TLBProtV:
+ENTRY(EV_TLBProtV)
 	SAVE_ALL_SYS
 	SAVE_EXCEPTION_SOURCE
 	mov	%r1, %sp
 	j	do_tlb_prot_violation
+ENDPROC(EV_TLBProtV)
 
-EV_PrivilegeV:
+ENTRY(EV_PrivilegeV)
 	SAVE_ALL_SYS
 	mov	%r0, %sp
 	j	do_privilege_violation
+ENDPROC(EV_PrivilegeV)
 
-EV_Trap:
+ENTRY(EV_Trap)
 	SAVE_ALL_SYS
 	mov	%r0, %sp
 	j	do_trap
+ENDPROC(EV_Trap)
 
-EV_Extension:
+ENTRY(EV_Extension)
 	SAVE_ALL_SYS
 	mov	%r0, %sp
 	j	do_extension
+ENDPROC(EV_Extension)
 
 /*
  * void relocate_code (addr_sp, gd, addr_moni)
@@ -196,9 +184,7 @@ EV_Extension:
  * r1 = new__gd
  * r2 = relocaddr
  */
-.align 4
-.globl	relocate_code
-relocate_code:
+ENTRY(relocate_code)
 	/*
 	 * r0-r12 might be clobbered by C functions
 	 * so we use r13-r16 for storage here
@@ -252,3 +238,4 @@ do_board_init_r:
 	mov	%r0, %r14		/* 1-st parameter: gd_t */
 	mov	%r1, %r15		/* 2-nd parameter: dest_addr */
 	j	[%r2]
+ENDPROC(relocate_code)