This separation makes maintenance of code easier because those low-level
interrupt- or exception handling routines are pretty static and usually
require not much care while start-up code is a subject of modifications
and enhancements.
Signed-off-by: Alexey Brodkin <abrod...@synopsys.com>
---
arch/arc/lib/Makefile | 1 +
arch/arc/lib/{start.S => ints_low.S} | 92 +---------------------
arch/arc/lib/start.S | 144 -----------------------------------
3 files changed, 2 insertions(+), 235 deletions(-)
copy arch/arc/lib/{start.S => ints_low.S} (50%)
diff --git a/arch/arc/lib/Makefile b/arch/arc/lib/Makefile
index ad66ac2..b1f1fbe 100644
--- a/arch/arc/lib/Makefile
+++ b/arch/arc/lib/Makefile
@@ -19,6 +19,7 @@ obj-y += memset.o
obj-y += reset.o
obj-y += timer.o
obj-y += start.o
+obj-y += ints_low.o
obj-$(CONFIG_CMD_BOOTM) += bootm.o
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/ints_low.S
similarity index 50%
copy from arch/arc/lib/start.S
copy to arch/arc/lib/ints_low.S
index 39eace3..161cf37 100644
--- a/arch/arc/lib/start.S
+++ b/arch/arc/lib/ints_low.S
@@ -1,13 +1,10 @@
/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
+ * Copyright (C) 2013-2015 Synopsys, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
-#include <asm-offsets.h>
-#include <config.h>
#include <linux/linkage.h>
-#include <asm/arcregs.h>
/*
* Note on the LD/ST addressing modes with address register write-back
@@ -89,27 +86,6 @@
#endif
.endm
-ENTRY(_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
-ENDPROC(_start)
-
ENTRY(memory_error)
SAVE_ALL_SYS
SAVE_EXCEPTION_SOURCE
@@ -173,69 +149,3 @@ ENTRY(EV_Extension)
mov %r0, %sp
j do_extension
ENDPROC(EV_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
- */
-ENTRY(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]
-ENDPROC(relocate_code)
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S
index 39eace3..3408f45 100644
--- a/arch/arc/lib/start.S
+++ b/arch/arc/lib/start.S
@@ -9,86 +9,6 @@
#include <linux/linkage.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 we read %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
-
ENTRY(_start)
/* Setup interrupt vector base that matches "__text_start" */
sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
@@ -110,70 +30,6 @@ clear_bss:
j board_init_f
ENDPROC(_start)
-ENTRY(memory_error)
- SAVE_ALL_SYS
- SAVE_EXCEPTION_SOURCE
- mov %r1, %sp
- j do_memory_error
-ENDPROC(memory_error)
-
-ENTRY(instruction_error)
- SAVE_ALL_SYS
- SAVE_EXCEPTION_SOURCE
- mov %r1, %sp
- j do_instruction_error
-ENDPROC(instruction_error)
-
-ENTRY(interrupt_handler)
- /* Todo - save and restore CPU context when interrupts will be in use */
- bl do_interrupt_handler
- rtie
-ENDPROC(interrupt_handler)
-
-ENTRY(EV_MachineCheck)
- SAVE_ALL_SYS
- SAVE_EXCEPTION_SOURCE
- mov %r1, %sp
- j do_machine_check_fault
-ENDPROC(EV_MachineCheck)
-
-ENTRY(EV_TLBMissI)
- SAVE_ALL_SYS
- mov %r0, %sp
- j do_itlb_miss
-ENDPROC(EV_TLBMissI)
-
-ENTRY(EV_TLBMissD)
- SAVE_ALL_SYS
- mov %r0, %sp
- j do_dtlb_miss
-ENDPROC(EV_TLBMissD)
-
-ENTRY(EV_TLBProtV)
- SAVE_ALL_SYS
- SAVE_EXCEPTION_SOURCE
- mov %r1, %sp
- j do_tlb_prot_violation
-ENDPROC(EV_TLBProtV)
-
-ENTRY(EV_PrivilegeV)
- SAVE_ALL_SYS
- mov %r0, %sp
- j do_privilege_violation
-ENDPROC(EV_PrivilegeV)
-
-ENTRY(EV_Trap)
- SAVE_ALL_SYS
- mov %r0, %sp
- j do_trap
-ENDPROC(EV_Trap)
-
-ENTRY(EV_Extension)
- SAVE_ALL_SYS
- mov %r0, %sp
- j do_extension
-ENDPROC(EV_Extension)
-
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
--
2.1.0
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