X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farm920t%2Fstart.S;h=07404502c829eb1ad4eb05cb602a41603fa37447;hb=6a2f30a03acbf226aeb5a93783e6172aa0682d78;hp=889329fa59ce397d8eed667435a3c7e3b4906baf;hpb=fa6c7413d1d5256516aad30b97eba3e4094c7ea3;p=karo-tx-uboot.git diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S index 889329fa59..07404502c8 100644 --- a/arch/arm/cpu/arm920t/start.S +++ b/arch/arm/cpu/arm920t/start.S @@ -5,59 +5,13 @@ * Copyright (c) 2002 Alex Züpke * Copyright (c) 2002 Gary Jennejohn * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA + * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include -/* - ************************************************************************* - * - * Jump vector table as in table 3.1 in [1] - * - ************************************************************************* - */ - - -.globl _start -_start: b start_code - ldr pc, _undefined_instruction - ldr pc, _software_interrupt - ldr pc, _prefetch_abort - ldr pc, _data_abort - ldr pc, _not_used - ldr pc, _irq - ldr pc, _fiq - -_undefined_instruction: .word undefined_instruction -_software_interrupt: .word software_interrupt -_prefetch_abort: .word prefetch_abort -_data_abort: .word data_abort -_not_used: .word not_used -_irq: .word irq -_fiq: .word fiq - - .balignl 16,0xdeadbeef - - /* ************************************************************************* * @@ -71,54 +25,9 @@ _fiq: .word fiq ************************************************************************* */ -.globl _TEXT_BASE -_TEXT_BASE: -#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_TEXT_BASE) - .word CONFIG_SPL_TEXT_BASE -#else - .word CONFIG_SYS_TEXT_BASE -#endif - -/* - * These are defined in the board-specific linker script. - * Subtracting _start from them lets the linker put their - * relative position in the executable instead of leaving - * them null. - */ -.globl _bss_start_ofs -_bss_start_ofs: - .word __bss_start - _start - -.globl _bss_end_ofs -_bss_end_ofs: - .word __bss_end - _start + .globl reset -.globl _end_ofs -_end_ofs: - .word _end - _start - -#ifdef CONFIG_USE_IRQ -/* IRQ stack memory (calculated at run-time) */ -.globl IRQ_STACK_START -IRQ_STACK_START: - .word 0x0badc0de - -/* IRQ stack memory (calculated at run-time) */ -.globl FIQ_STACK_START -FIQ_STACK_START: - .word 0x0badc0de -#endif - -/* IRQ stack memory (calculated at run-time) + 8 bytes */ -.globl IRQ_STACK_START_IN -IRQ_STACK_START_IN: - .word 0x0badc0de - -/* - * the actual start code - */ - -start_code: +reset: /* * set the cpu to SVC32 mode */ @@ -190,81 +99,6 @@ copyex: /*------------------------------------------------------------------------------*/ -#ifndef CONFIG_SPL_BUILD -/* - * void relocate_code(addr_moni) - * - * This function relocates the monitor code. - */ - .globl relocate_code -relocate_code: - mov r6, r0 /* save addr of destination */ - - adr r0, _start - subs r9, r6, r0 /* r9 <- relocation offset */ - beq relocate_done /* skip relocation */ - mov r1, r6 /* r1 <- scratch for copy_loop */ - ldr r3, _image_copy_end_ofs - add r2, r0, r3 /* r2 <- source end address */ - -copy_loop: - ldmia r0!, {r10-r11} /* copy from source address [r0] */ - stmia r1!, {r10-r11} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - blo copy_loop - - /* - * fix .rel.dyn relocations - */ - ldr r0, _TEXT_BASE /* r0 <- Text base */ - ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ - add r10, r10, r0 /* r10 <- sym table in FLASH */ - ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ - add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ - ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ - add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ -fixloop: - ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ - add r0, r0, r9 /* r0 <- location to fix up in RAM */ - ldr r1, [r2, #4] - and r7, r1, #0xff - cmp r7, #23 /* relative fixup? */ - beq fixrel - cmp r7, #2 /* absolute fixup? */ - beq fixabs - /* ignore unknown type of fixup */ - b fixnext -fixabs: - /* absolute fix: set location to (offset) symbol value */ - mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ - add r1, r10, r1 /* r1 <- address of symbol in table */ - ldr r1, [r1, #4] /* r1 <- symbol value */ - add r1, r1, r9 /* r1 <- relocated sym addr */ - b fixnext -fixrel: - /* relative fix: increase location by offset */ - ldr r1, [r0] - add r1, r1, r9 -fixnext: - str r1, [r0] - add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ - cmp r2, r3 - blo fixloop -relocate_done: - - mov pc, lr - -_image_copy_end_ofs: - .word __image_copy_end - _start -_rel_dyn_start_ofs: - .word __rel_dyn_start - _start -_rel_dyn_end_ofs: - .word __rel_dyn_end - _start -_dynsym_start_ofs: - .word __dynsym_start - _start - -#endif - .globl c_runtime_cpu_setup c_runtime_cpu_setup: @@ -313,166 +147,3 @@ cpu_init_crit: mov lr, ip mov pc, lr #endif /* CONFIG_SKIP_LOWLEVEL_INIT */ - -/* - ************************************************************************* - * - * Interrupt handling - * - ************************************************************************* - */ - -@ -@ IRQ stack frame. -@ -#define S_FRAME_SIZE 72 - -#define S_OLD_R0 68 -#define S_PSR 64 -#define S_PC 60 -#define S_LR 56 -#define S_SP 52 - -#define S_IP 48 -#define S_FP 44 -#define S_R10 40 -#define S_R9 36 -#define S_R8 32 -#define S_R7 28 -#define S_R6 24 -#define S_R5 20 -#define S_R4 16 -#define S_R3 12 -#define S_R2 8 -#define S_R1 4 -#define S_R0 0 - -#define MODE_SVC 0x13 -#define I_BIT 0x80 - -/* - * use bad_save_user_regs for abort/prefetch/undef/swi ... - * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling - */ - - .macro bad_save_user_regs - sub sp, sp, #S_FRAME_SIZE - stmia sp, {r0 - r12} @ Calling r0-r12 - ldr r2, IRQ_STACK_START_IN - ldmia r2, {r2 - r3} @ get pc, cpsr - add r0, sp, #S_FRAME_SIZE @ restore sp_SVC - - add r5, sp, #S_SP - mov r1, lr - stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr - mov r0, sp - .endm - - .macro irq_save_user_regs - sub sp, sp, #S_FRAME_SIZE - stmia sp, {r0 - r12} @ Calling r0-r12 - add r7, sp, #S_PC - stmdb r7, {sp, lr}^ @ Calling SP, LR - str lr, [r7, #0] @ Save calling PC - mrs r6, spsr - str r6, [r7, #4] @ Save CPSR - str r0, [r7, #8] @ Save OLD_R0 - mov r0, sp - .endm - - .macro irq_restore_user_regs - ldmia sp, {r0 - lr}^ @ Calling r0 - lr - mov r0, r0 - ldr lr, [sp, #S_PC] @ Get PC - add sp, sp, #S_FRAME_SIZE - /* return & move spsr_svc into cpsr */ - subs pc, lr, #4 - .endm - - .macro get_bad_stack - ldr r13, IRQ_STACK_START_IN @ setup our mode stack - - str lr, [r13] @ save caller lr / spsr - mrs lr, spsr - str lr, [r13, #4] - - mov r13, #MODE_SVC @ prepare SVC-Mode - @ msr spsr_c, r13 - msr spsr, r13 - mov lr, pc - movs pc, lr - .endm - - .macro get_irq_stack @ setup IRQ stack - ldr sp, IRQ_STACK_START - .endm - - .macro get_fiq_stack @ setup FIQ stack - ldr sp, FIQ_STACK_START - .endm - -/* - * exception handlers - */ - .align 5 -undefined_instruction: - get_bad_stack - bad_save_user_regs - bl do_undefined_instruction - - .align 5 -software_interrupt: - get_bad_stack - bad_save_user_regs - bl do_software_interrupt - - .align 5 -prefetch_abort: - get_bad_stack - bad_save_user_regs - bl do_prefetch_abort - - .align 5 -data_abort: - get_bad_stack - bad_save_user_regs - bl do_data_abort - - .align 5 -not_used: - get_bad_stack - bad_save_user_regs - bl do_not_used - -#ifdef CONFIG_USE_IRQ - - .align 5 -irq: - get_irq_stack - irq_save_user_regs - bl do_irq - irq_restore_user_regs - - .align 5 -fiq: - get_fiq_stack - /* someone ought to write a more effiction fiq_save_user_regs */ - irq_save_user_regs - bl do_fiq - irq_restore_user_regs - -#else - - .align 5 -irq: - get_bad_stack - bad_save_user_regs - bl do_irq - - .align 5 -fiq: - get_bad_stack - bad_save_user_regs - bl do_fiq - -#endif