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x86, kgdb: early trap init for early debug 

Allow the x86 arch to have early exception processing for the purpose
of debugging via the kgdb.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jan Kiszka 2010-05-20 21:04:29 -05:00 committed by Jason Wessel
parent 4402c153cb
commit 29c843912a
3 changed files with 13 additions and 4 deletions
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2
arch/x86/include/asm/processor.h
View File

@ -789,6 +789,8 @@ static inline void wbinvd_halt(void)
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);
extern void early_trap_init(void);
/* Defined in head.S */
extern struct desc_ptr early_gdt_descr;

1
arch/x86/kernel/setup.c
View File

@ -725,6 +725,7 @@ void __init setup_arch(char **cmdline_p)
/* VMI may relocate the fixmap; do this before touching ioremap area */
vmi_init();
early_trap_init();
early_cpu_init();
early_ioremap_init();

14
arch/x86/kernel/traps.c
View File

@ -808,6 +808,16 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
}
#endif
/* Set of traps needed for early debugging. */
void __init early_trap_init(void)
{
set_intr_gate_ist(1, &debug, DEBUG_STACK);
/* int3 can be called from all */
set_system_intr_gate_ist(3, &int3, DEBUG_STACK);
set_intr_gate(14, &page_fault);
load_idt(&idt_descr);
}
void __init trap_init(void)
{
int i;
@ -821,10 +831,7 @@ void __init trap_init(void)
#endif
set_intr_gate(0, &divide_error);
set_intr_gate_ist(1, &debug, DEBUG_STACK);
set_intr_gate_ist(2, &nmi, NMI_STACK);
/* int3 can be called from all */
set_system_intr_gate_ist(3, &int3, DEBUG_STACK);
/* int4 can be called from all */
set_system_intr_gate(4, &overflow);
set_intr_gate(5, &bounds);
@ -840,7 +847,6 @@ void __init trap_init(void)
set_intr_gate(11, &segment_not_present);
set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK);
set_intr_gate(13, &general_protection);
set_intr_gate(14, &page_fault);
set_intr_gate(15, &spurious_interrupt_bug);
set_intr_gate(16, &coprocessor_error);
set_intr_gate(17, &alignment_check);