diff options
| -rw-r--r-- | src/arch/armv7/Makefile.inc | 3 | ||||
| -rw-r--r-- | src/arch/armv7/exception.c | 158 | ||||
| -rw-r--r-- | src/arch/armv7/exception_asm.S | 115 | ||||
| -rw-r--r-- | src/arch/armv7/include/arch/exception.h | 38 | ||||
| -rw-r--r-- | src/mainboard/google/snow/ramstage.c | 5 |
5 files changed, 318 insertions, 1 deletions
diff --git a/src/arch/armv7/Makefile.inc b/src/arch/armv7/Makefile.inc index 0595ae246e..e708f6d818 100644 --- a/src/arch/armv7/Makefile.inc +++ b/src/arch/armv7/Makefile.inc @@ -158,6 +158,9 @@ $(obj)/mainboard/$(MAINBOARDDIR)/romstage.pre.inc: $(src)/mainboard/$(MAINBOARDD $(CC) -MMD $(CFLAGS) -D__PRE_RAM__ -I$(src) -I. -I$(obj) -c -S $< -o $@ # Things that appear in every board +ramstage-y += exception.c +ramstage-y += exception_asm.S + romstage-srcs += $(objgenerated)/crt0.s ramstage-srcs += src/mainboard/$(MAINBOARDDIR)/mainboard.c ifeq ($(CONFIG_GENERATE_PIRQ_TABLE),y) diff --git a/src/arch/armv7/exception.c b/src/arch/armv7/exception.c new file mode 100644 index 0000000000..14f82163c6 --- /dev/null +++ b/src/arch/armv7/exception.c @@ -0,0 +1,158 @@ +/* + * This file is part of the libpayload project. + * + * Copyright 2013 Google Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <console/console.h> +#include <arch/exception.h> +#include <stdint.h> + +void exception_test(void); + +static int test_abort; + +void exception_undefined_instruction(uint32_t *); +void exception_software_interrupt(uint32_t *); +void exception_prefetch_abort(uint32_t *); +void exception_data_abort(uint32_t *); +void exception_not_used(uint32_t *); +void exception_irq(uint32_t *); +void exception_fiq(uint32_t *); + +static void print_regs(uint32_t *regs) +{ + int i; + /* Don't print the link register and stack pointer since we don't have their + * actual value. They are hidden by the 'shadow' registers provided + * by the trap hardware. + */ + for (i = 0; i < 16; i++) { + if (i == 15) + printk(BIOS_ERR, "PC"); + else if (i == 14) + continue; /* LR */ + else if (i == 13) + continue; /* SP */ + else if (i == 12) + printk(BIOS_ERR, "IP"); + else + printk(BIOS_ERR, "R%d", i); + printk(BIOS_ERR, " = 0x%08x\n", regs[i]); + } +} + +void exception_undefined_instruction(uint32_t *regs) +{ + printk(BIOS_ERR, "exception _undefined_instruction\n"); + print_regs(regs); + die("exception"); +} + +void exception_software_interrupt(uint32_t *regs) +{ + printk(BIOS_ERR, "exception _software_interrupt\n"); + print_regs(regs); + die("exception"); +} + +void exception_prefetch_abort(uint32_t *regs) +{ + printk(BIOS_ERR, "exception _prefetch_abort\n"); + print_regs(regs); + die("exception"); +} + +void exception_data_abort(uint32_t *regs) +{ + if (test_abort) { + regs[15] = regs[0]; + return; + } else { + printk(BIOS_ERR, "exception _data_abort\n"); + print_regs(regs); + } + die("exception"); +} + +void exception_not_used(uint32_t *regs) +{ + printk(BIOS_ERR, "exception _not_used\n"); + print_regs(regs); + die("exception"); +} + +void exception_irq(uint32_t *regs) +{ + printk(BIOS_ERR, "exception _irq\n"); + print_regs(regs); + die("exception"); +} + +void exception_fiq(uint32_t *regs) +{ + printk(BIOS_ERR, "exception _fiq\n"); + print_regs(regs); + die("exception"); +} + +static inline uint32_t get_sctlr(void) +{ + uint32_t val; + asm("mrc p15, 0, %0, c1, c0, 0" : "=r" (val)); + return val; +} + +static inline void set_sctlr(uint32_t val) +{ + asm volatile("mcr p15, 0, %0, c1, c0, 0" :: "r" (val)); + asm volatile("" ::: "memory"); +} + +void exception_init(void) +{ + static const uint32_t sctlr_te = (0x1 << 30); + static const uint32_t sctlr_v = (0x1 << 13); + static const uint32_t sctlr_a = (0x1 << 1); + + uint32_t sctlr = get_sctlr(); + /* Handle exceptions in ARM mode. */ + sctlr &= ~sctlr_te; + /* Set V=0 in SCTLR so VBAR points to the exception vector table. */ + sctlr &= ~sctlr_v; + /* Enforce alignment. */ + sctlr |= sctlr_a; + set_sctlr(sctlr); + + extern uint32_t exception_table[]; + set_vbar((uintptr_t)exception_table); + + test_abort = 1; + printk(BIOS_ERR, "Testing exceptions\n"); + exception_test(); + test_abort = 0; + printk(BIOS_ERR, "Testing exceptions: DONE\n"); +} diff --git a/src/arch/armv7/exception_asm.S b/src/arch/armv7/exception_asm.S new file mode 100644 index 0000000000..e46f4bcf6b --- /dev/null +++ b/src/arch/armv7/exception_asm.S @@ -0,0 +1,115 @@ +/* + * This file is part of the libpayload project. + * + * Copyright 2013 Google Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +exception_stack: + .align 5 + .skip 0x2000, 0xa5 +exception_stack_end: + .word exception_stack_end + +exception_handler: + .word 0 + + + .align 6 + .arm + .global exception_table +exception_table: + b 1f + b 2f + b 3f + b 4f + b 5f + b 6f + b 7f + b 8f + +1: + ldr sp, _not_used + b exception_common +2: + ldr sp, _undefined_instruction + b exception_common +3: + ldr sp, _software_interrupt + b exception_common +4: + ldr sp, _prefetch_abort + b exception_common +5: + ldr sp, _data_abort + b exception_common +6: + ldr sp, _not_used + b exception_common +7: + ldr sp, _irq + b exception_common +8: + ldr sp, _fiq + b exception_common + +exception_common: + str sp, exception_handler + ldr sp, exception_stack_end + push { lr } + sub sp, sp, $8 + push { r0 - r12 } + mov r0, sp + mov lr, pc + ldr pc, exception_handler + pop { r0 - r12 } + add sp, sp, $8 + ldm sp!, { pc }^ + + +_undefined_instruction: .word exception_undefined_instruction +_software_interrupt: .word exception_software_interrupt +_prefetch_abort: .word exception_prefetch_abort +_data_abort: .word exception_data_abort +_not_used: .word exception_not_used +_irq: .word exception_irq +_fiq: .word exception_fiq + + .thumb + .global set_vbar + .thumb_func +set_vbar: + mcr p15, 0, r0, c12, c0, 0 + bx lr + + .global exception_test + .thumb_func +exception_test: + mov r1, $1 + mov r0, pc + add r0, $3 + ldr r1, [r1] + bx lr + diff --git a/src/arch/armv7/include/arch/exception.h b/src/arch/armv7/include/arch/exception.h new file mode 100644 index 0000000000..57076bd57b --- /dev/null +++ b/src/arch/armv7/include/arch/exception.h @@ -0,0 +1,38 @@ +/* + * This file is part of the libpayload project. + * + * Copyright 2013 Google Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef _ARCH_EXCEPTION_H +#define _ARCH_EXCEPTION_H + +#include <stdint.h> + +void exception_init(void); +void set_vbar(uint32_t vbar); + +#endif diff --git a/src/mainboard/google/snow/ramstage.c b/src/mainboard/google/snow/ramstage.c index 9f259ef30e..be5216f2b7 100644 --- a/src/mainboard/google/snow/ramstage.c +++ b/src/mainboard/google/snow/ramstage.c @@ -19,6 +19,7 @@ #include <console/console.h> #include <cbmem.h> +#include <arch/exception.h> #include <cpu/samsung/exynos5250/clk.h> #include <cpu/samsung/exynos5250/power.h> @@ -26,8 +27,10 @@ void hardwaremain(int boot_complete); void main(void) { console_init(); - printk(BIOS_INFO, "hello from ramstage\n"); + printk(BIOS_INFO, "hello from ramstage; now with deluxe exception handling.\n"); + /* this is going to move, but we must have it now and we're not sure where */ + exception_init(); /* place at top of physical memory */ high_tables_size = CONFIG_COREBOOT_TABLES_SIZE; high_tables_base = CONFIG_SYS_SDRAM_BASE + |