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nios2: rework trap handler

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Redefine trap handler as below:

 0  N/A        reserved for system calls
 1  SIGUSR1    user-defined signal 1
 2  SIGUSR2    user-defined signal 2
 3  SIGILL     illegal instruction
 4..29         reserved (but implemented to raise SIGILL instead of being undefined)
30  SIGTRAP    KGDB
31  SIGTRAP    trace/breakpoint trap

Signed-off-by: Ley Foon Tan <lftan@altera.com>
This commit is contained in:
Ley Foon Tan 2015-04-16 15:19:01 +08:00
parent 170c381f6b
commit baa54ab93c
2 changed files with 69 additions and 36 deletions
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71
arch/nios2/kernel/entry.S
View file

@ -92,35 +92,35 @@ exception_table:
trap_table:
.word handle_system_call /* 0 */
.word instruction_trap /* 1 */
.word instruction_trap /* 2 */
.word instruction_trap /* 3 */
.word instruction_trap /* 4 */
.word instruction_trap /* 5 */
.word instruction_trap /* 6 */
.word instruction_trap /* 7 */
.word instruction_trap /* 8 */
.word instruction_trap /* 9 */
.word instruction_trap /* 10 */
.word instruction_trap /* 11 */
.word instruction_trap /* 12 */
.word instruction_trap /* 13 */
.word instruction_trap /* 14 */
.word instruction_trap /* 15 */
.word instruction_trap /* 16 */
.word instruction_trap /* 17 */
.word instruction_trap /* 18 */
.word instruction_trap /* 19 */
.word instruction_trap /* 20 */
.word instruction_trap /* 21 */
.word instruction_trap /* 22 */
.word instruction_trap /* 23 */
.word instruction_trap /* 24 */
.word instruction_trap /* 25 */
.word instruction_trap /* 26 */
.word instruction_trap /* 27 */
.word instruction_trap /* 28 */
.word instruction_trap /* 29 */
.word handle_trap_1 /* 1 */
.word handle_trap_2 /* 2 */
.word handle_trap_3 /* 3 */
.word handle_trap_reserved /* 4 */
.word handle_trap_reserved /* 5 */
.word handle_trap_reserved /* 6 */
.word handle_trap_reserved /* 7 */
.word handle_trap_reserved /* 8 */
.word handle_trap_reserved /* 9 */
.word handle_trap_reserved /* 10 */
.word handle_trap_reserved /* 11 */
.word handle_trap_reserved /* 12 */
.word handle_trap_reserved /* 13 */
.word handle_trap_reserved /* 14 */
.word handle_trap_reserved /* 15 */
.word handle_trap_reserved /* 16 */
.word handle_trap_reserved /* 17 */
.word handle_trap_reserved /* 18 */
.word handle_trap_reserved /* 19 */
.word handle_trap_reserved /* 20 */
.word handle_trap_reserved /* 21 */
.word handle_trap_reserved /* 22 */
.word handle_trap_reserved /* 23 */
.word handle_trap_reserved /* 24 */
.word handle_trap_reserved /* 25 */
.word handle_trap_reserved /* 26 */
.word handle_trap_reserved /* 27 */
.word handle_trap_reserved /* 28 */
.word handle_trap_reserved /* 29 */
#ifdef CONFIG_KGDB
.word handle_kgdb_breakpoint /* 30 KGDB breakpoint */
#else
@ -455,6 +455,19 @@ handle_kgdb_breakpoint:
br ret_from_exception
#endif
handle_trap_1:
call handle_trap_1_c
br ret_from_exception
handle_trap_2:
call handle_trap_2_c
br ret_from_exception
handle_trap_3:
handle_trap_reserved:
call handle_trap_3_c
br ret_from_exception
/*
* Beware - when entering resume, prev (the current task) is
* in r4, next (the new task) is in r5, don't change these

34
arch/nios2/kernel/traps.c
View file

@ -23,6 +23,17 @@
static DEFINE_SPINLOCK(die_lock);
static void _send_sig(int signo, int code, unsigned long addr)
{
siginfo_t info;
info.si_signo = signo;
info.si_errno = 0;
info.si_code = code;
info.si_addr = (void __user *) addr;
force_sig_info(signo, &info, current);
}
void die(const char *str, struct pt_regs *regs, long err)
{
console_verbose();
@ -39,16 +50,10 @@ void die(const char *str, struct pt_regs *regs, long err)
void _exception(int signo, struct pt_regs *regs, int code, unsigned long addr)
{
siginfo_t info;
if (!user_mode(regs))
die("Exception in kernel mode", regs, signo);
info.si_signo = signo;
info.si_errno = 0;
info.si_code = code;
info.si_addr = (void __user *) addr;
force_sig_info(signo, &info, current);
_send_sig(signo, code, addr);
}
/*
@ -183,3 +188,18 @@ asmlinkage void unhandled_exception(struct pt_regs *regs, int cause)
pr_emerg("opcode: 0x%08lx\n", *(unsigned long *)(regs->ea));
}
asmlinkage void handle_trap_1_c(struct pt_regs *fp)
{
_send_sig(SIGUSR1, 0, fp->ea);
}
asmlinkage void handle_trap_2_c(struct pt_regs *fp)
{
_send_sig(SIGUSR2, 0, fp->ea);
}
asmlinkage void handle_trap_3_c(struct pt_regs *fp)
{
_send_sig(SIGILL, ILL_ILLTRP, fp->ea);
}