Commit 29c84391 authored by Jan Kiszka's avatar Jan Kiszka Committed by Jason Wessel
Browse files

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: default avatarJan Kiszka <jan.kiszka@web.de>
Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
parent 4402c153

arch/x86/include/asm/processor.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

arch/x86/kernel/setup.c

+1 −0
Original line number Diff line number Diff line
@@ -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();

arch/x86/kernel/traps.c

+10 −4
Original line number Diff line number Diff line
@@ -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);

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