diff options
Diffstat (limited to 'arch/openrisc/cpu/exceptions.c')
-rw-r--r-- | arch/openrisc/cpu/exceptions.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/openrisc/cpu/exceptions.c b/arch/openrisc/cpu/exceptions.c new file mode 100644 index 00000000000..5d9f117df02 --- /dev/null +++ b/arch/openrisc/cpu/exceptions.c @@ -0,0 +1,85 @@ +/* + * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> + * (C) Copyright 2011, Julius Baxter <julius@opencores.org> + * + * 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 + */ + +#include <common.h> +#include <stdio_dev.h> +#include <asm/system.h> + +static const char * const excp_table[] = { + "Unknown exception", + "Reset", + "Bus Error", + "Data Page Fault", + "Instruction Page Fault", + "Tick Timer", + "Alignment", + "Illegal Instruction", + "External Interrupt", + "D-TLB Miss", + "I-TLB Miss", + "Range", + "System Call", + "Floating Point", + "Trap", +}; + +static void (*handlers[32])(void); + +void exception_install_handler(int exception, void (*handler)(void)) +{ + if (exception < 0 || exception > 31) + return; + + handlers[exception] = handler; +} + +void exception_free_handler(int exception) +{ + if (exception < 0 || exception > 31) + return; + + handlers[exception] = 0; +} + +static void exception_hang(int vect) +{ + printf("Unhandled exception at 0x%x ", vect & 0xff00); + + vect = ((vect >> 8) & 0xff); + if (vect < ARRAY_SIZE(excp_table)) + printf("(%s)\n", excp_table[vect]); + else + printf("(%s)\n", excp_table[0]); + + printf("EPCR: 0x%08lx\n", mfspr(SPR_EPCR_BASE)); + printf("EEAR: 0x%08lx\n", mfspr(SPR_EEAR_BASE)); + printf("ESR: 0x%08lx\n", mfspr(SPR_ESR_BASE)); + hang(); +} + +void exception_handler(int vect) +{ + int exception = vect >> 8; + + if (handlers[exception]) + handlers[exception](); + else + exception_hang(vect); +} |