0,0 → 1,163 |
/* |
* Copyright (C) 2003-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - 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. |
* - 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 ``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 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 <arch/exception.h> |
#include <arch/interrupt.h> |
#include <panic.h> |
#include <arch/cp0.h> |
#include <arch/types.h> |
#include <arch.h> |
#include <debug.h> |
#include <proc/thread.h> |
#include <symtab.h> |
#include <print.h> |
#include <interrupt.h> |
#include <func.h> |
#include <console/kconsole.h> |
#include <arch/debugger.h> |
|
static char * exctable[] = { |
"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store", |
"Address Error - load/instr. fetch", |
"Address Error - store", |
"Bus Error - fetch instruction", |
"Bus Error - data reference", |
"Syscall", |
"BreakPoint", |
"Reserved Instruction", |
"Coprocessor Unusable", |
"Arithmetic Overflow", |
"Trap", |
"Virtual Coherency - instruction", |
"Floating Point", |
NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
"WatchHi/WatchLo", /* 23 */ |
NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
"Virtual Coherency - data", |
}; |
|
static void print_regdump(istate_t *istate) |
{ |
char *pcsymbol = ""; |
char *rasymbol = ""; |
|
char *s = get_symtab_entry(istate->epc); |
if (s) |
pcsymbol = s; |
s = get_symtab_entry(istate->ra); |
if (s) |
rasymbol = s; |
|
printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp); |
} |
|
static void unhandled_exception(int n, istate_t *istate) |
{ |
print_regdump(istate); |
panic("unhandled exception %s\n", exctable[n]); |
} |
|
static void reserved_instr_exception(int n, istate_t *istate) |
{ |
if (*((__u32 *)istate->epc) == 0x7c03e83b) { |
ASSERT(THREAD); |
istate->epc += 4; |
istate->v1 = istate->k1; |
} else |
unhandled_exception(n, istate); |
} |
|
static void breakpoint_exception(int n, istate_t *istate) |
{ |
#ifdef CONFIG_DEBUG |
debugger_bpoint(istate); |
#else |
/* it is necessary to not re-execute BREAK instruction after |
returning from Exception handler |
(see page 138 in R4000 Manual for more information) */ |
istate->epc += 4; |
#endif |
} |
|
static void tlbmod_exception(int n, istate_t *istate) |
{ |
tlb_modified(istate); |
} |
|
static void tlbinv_exception(int n, istate_t *istate) |
{ |
tlb_invalid(istate); |
} |
|
#ifdef CONFIG_FPU_LAZY |
static void cpuns_exception(int n, istate_t *istate) |
{ |
if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id) |
scheduler_fpu_lazy_request(); |
else |
panic("unhandled Coprocessor Unusable Exception\n"); |
} |
#endif |
|
static void interrupt_exception(int n, istate_t *istate) |
{ |
__u32 cause; |
int i; |
|
/* decode interrupt number and process the interrupt */ |
cause = (cp0_cause_read() >> 8) &0xff; |
|
for (i = 0; i < 8; i++) |
if (cause & (1 << i)) |
exc_dispatch(i+INT_OFFSET, istate); |
} |
|
/** Handle syscall userspace call */ |
static void syscall_exception(int n, istate_t *istate) |
{ |
panic("Syscall is handled through shortcut"); |
} |
|
void exception_init(void) |
{ |
int i; |
|
/* Clear exception table */ |
for (i=0;i < IVT_ITEMS; i++) |
exc_register(i, "undef", (iroutine) unhandled_exception); |
exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception); |
exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception); |
exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception); |
exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception); |
exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception); |
exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception); |
#ifdef CONFIG_FPU_LAZY |
exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception); |
#endif |
exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception); |
} |