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9a33fc217d
Currently is_valid_bugaddr() is true for anything >= PAGE_OFFSET, which happens to be 0 on nommu configurations. Make this a bit smarter by just reading in the opcode and comparing it against the trap type that we already know. Follows the logic from avr32. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
#include <linux/bug.h>
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#include <linux/io.h>
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#include <linux/types.h>
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#include <linux/kdebug.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <asm/system.h>
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#ifdef CONFIG_BUG
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static void handle_BUG(struct pt_regs *regs)
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{
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enum bug_trap_type tt;
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tt = report_bug(regs->pc, regs);
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if (tt == BUG_TRAP_TYPE_WARN) {
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regs->pc += instruction_size(regs->pc);
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return;
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}
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die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
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}
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int is_valid_bugaddr(unsigned long addr)
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{
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unsigned short opcode;
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if (addr < PAGE_OFFSET)
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return 0;
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if (probe_kernel_address((u16 *)addr, opcode))
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return 0;
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return opcode == TRAPA_BUG_OPCODE;
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}
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#endif
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/*
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* Generic trap handler.
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*/
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BUILD_TRAP_HANDLER(debug)
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{
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TRAP_HANDLER_DECL;
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/* Rewind */
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regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
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if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
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SIGTRAP) == NOTIFY_STOP)
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return;
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force_sig(SIGTRAP, current);
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}
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/*
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* Special handler for BUG() traps.
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*/
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BUILD_TRAP_HANDLER(bug)
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{
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TRAP_HANDLER_DECL;
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/* Rewind */
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regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
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if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
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SIGTRAP) == NOTIFY_STOP)
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return;
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#ifdef CONFIG_BUG
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if (__kernel_text_address(instruction_pointer(regs))) {
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opcode_t insn = *(opcode_t *)instruction_pointer(regs);
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if (insn == TRAPA_BUG_OPCODE)
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handle_BUG(regs);
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}
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#endif
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force_sig(SIGTRAP, current);
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}
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