diff options
Diffstat (limited to 'arch/blackfin/kernel')
| -rw-r--r-- | arch/blackfin/kernel/traps.c | 30 | ||||
| -rw-r--r-- | arch/blackfin/kernel/vmlinux.lds.S | 16 |
2 files changed, 44 insertions, 2 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c index aa76dfb0226..2405f193224 100644 --- a/arch/blackfin/kernel/traps.c +++ b/arch/blackfin/kernel/traps.c @@ -27,6 +27,7 @@ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#include <linux/bug.h> #include <linux/uaccess.h> #include <linux/interrupt.h> #include <linux/module.h> @@ -381,6 +382,23 @@ asmlinkage void trap_c(struct pt_regs *fp) /* 0x20 - Reserved, Caught by default */ /* 0x21 - Undefined Instruction, handled here */ case VEC_UNDEF_I: +#ifdef CONFIG_BUG + if (kernel_mode_regs(fp)) { + switch (report_bug(fp->pc, fp)) { + case BUG_TRAP_TYPE_NONE: + break; + case BUG_TRAP_TYPE_WARN: + dump_bfin_trace_buffer(); + fp->pc += 2; + goto traps_done; + case BUG_TRAP_TYPE_BUG: + /* call to panic() will dump trace, and it is + * off at this point, so it won't be clobbered + */ + panic("BUG()"); + } + } +#endif info.si_code = ILL_ILLOPC; sig = SIGILL; verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE)); @@ -792,6 +810,18 @@ void dump_bfin_trace_buffer(void) } EXPORT_SYMBOL(dump_bfin_trace_buffer); +#ifdef CONFIG_BUG +int is_valid_bugaddr(unsigned long addr) +{ + unsigned short opcode; + + if (!get_instruction(&opcode, (unsigned short *)addr)) + return 0; + + return opcode == BFIN_BUG_OPCODE; +} +#endif + /* * Checks to see if the address pointed to is either a * 16-bit CALL instruction, or a 32-bit CALL instruction diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S index 8b67167cb4f..119fbdb4647 100644 --- a/arch/blackfin/kernel/vmlinux.lds.S +++ b/arch/blackfin/kernel/vmlinux.lds.S @@ -166,6 +166,20 @@ SECTIONS } PERCPU(4) SECURITY_INIT + + /* we have to discard exit text and such at runtime, not link time, to + * handle embedded cross-section references (alt instructions, bug + * table, eh_frame, etc...) + */ + .exit.text : + { + EXIT_TEXT + } + .exit.data : + { + EXIT_DATA + } + .init.ramfs : { . = ALIGN(4); @@ -264,8 +278,6 @@ SECTIONS /DISCARD/ : { - EXIT_TEXT - EXIT_DATA *(.exitcall.exit) } } |