Signed-off-by: Graeme Russ graeme.russ@gmail.com --- arch/i386/cpu/interrupts.c | 23 +++++++++++++++++++---- arch/i386/include/asm/interrupt.h | 2 ++ arch/i386/include/asm/ptrace.h | 24 ++++++++++++++++++++++++ 3 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/arch/i386/cpu/interrupts.c b/arch/i386/cpu/interrupts.c index 47a7a29..e4d0868 100644 --- a/arch/i386/cpu/interrupts.c +++ b/arch/i386/cpu/interrupts.c @@ -104,7 +104,7 @@ static inline unsigned long get_debugreg(int regno) return val; }
-void dump_regs(struct pt_regs *regs) +void dump_regs(struct irq_regs *regs) { unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L; unsigned long d0, d1, d2, d3, d6, d7; @@ -225,7 +225,7 @@ int disable_interrupts(void) }
/* IRQ Low-Level Service Routine */ -void irq_llsr(struct pt_regs *regs) +void irq_llsr(struct irq_regs *regs) { /* * For detailed description of each exception, refer to: @@ -234,7 +234,7 @@ void irq_llsr(struct pt_regs *regs) * Order Number: 253665-029US, November 2008 * Table 6-1. Exceptions and Interrupts */ - switch (regs->orig_eax) { + switch (regs->irq_id) { case 0x00: printf("Divide Error (Division by zero)\n"); dump_regs(regs); @@ -340,7 +340,7 @@ void irq_llsr(struct pt_regs *regs)
default: /* Hardware or User IRQ */ - do_irq(regs->orig_eax); + do_irq(regs->irq_id); } }
@@ -352,17 +352,30 @@ void irq_llsr(struct pt_regs *regs) * Interrupt entries are now very small (a push and a jump) but they are * now slower (all registers pushed on stack which provides complete * crash dumps in the low level handlers + * + * Interrupt Entry Point: + * - Interrupt has caused eflags, CS and EIP to be pushed + * - Interrupt Vector Handler has pushed orig_eax + * - pt_regs.esp needs to be adjusted by 40 bytes: + * 12 bytes pushed by CPU (EFLAGSF, CS, EIP) + * 4 bytes pushed by vector handler (irq_id) + * 24 bytes pushed before SP (SS, GS, FS, ES, DS, EAX) + * NOTE: Only longs are pushed on/popped off the stack! */ asm(".globl irq_common_entry\n" \ ".hidden irq_common_entry\n" \ ".type irq_common_entry, @function\n" \ "irq_common_entry:\n" \ "cld\n" \ + "pushl %ss\n" \ "pushl %gs\n" \ "pushl %fs\n" \ "pushl %es\n" \ "pushl %ds\n" \ "pushl %eax\n" \ + "movl %esp, %eax\n" \ + "addl $40, %eax\n" \ + "pushl %eax\n" \ "pushl %ebp\n" \ "pushl %edi\n" \ "pushl %esi\n" \ @@ -378,10 +391,12 @@ asm(".globl irq_common_entry\n" \ "popl %edi\n" \ "popl %ebp\n" \ "popl %eax\n" \ + "popl %eax\n" \ "popl %ds\n" \ "popl %es\n" \ "popl %fs\n" \ "popl %gs\n" \ + "popl %ss\n" \ "add $4, %esp\n" \ "iret\n" \ DECLARE_INTERRUPT(0) \ diff --git a/arch/i386/include/asm/interrupt.h b/arch/i386/include/asm/interrupt.h index 99ae843..d32ef8b 100644 --- a/arch/i386/include/asm/interrupt.h +++ b/arch/i386/include/asm/interrupt.h @@ -27,6 +27,8 @@ #ifndef __ASM_INTERRUPT_H_ #define __ASM_INTERRUPT_H_ 1
+#include <asm/types.h> + /* arch/i386/cpu/interrupts.c */ void set_vector(u8 intnum, void *routine);
diff --git a/arch/i386/include/asm/ptrace.h b/arch/i386/include/asm/ptrace.h index 750e40d..a727dbf 100644 --- a/arch/i386/include/asm/ptrace.h +++ b/arch/i386/include/asm/ptrace.h @@ -1,6 +1,8 @@ #ifndef _I386_PTRACE_H #define _I386_PTRACE_H
+#include <asm/types.h> + #define EBX 0 #define ECX 1 #define EDX 2 @@ -43,6 +45,28 @@ struct pt_regs { int xss; } __attribute__ ((packed));
+struct irq_regs { + /* Pushed by irq_common_entry */ + long ebx; + long ecx; + long edx; + long esi; + long edi; + long ebp; + long esp; + long eax; + long xds; + long xes; + long xfs; + long xgs; + long xss; + /* Pushed by vector handler (irq_<num>) */ + long irq_id; + /* Pushed by cpu in response to interrupt */ + long eip; + long xcs; + long eflags; +} __attribute__ ((packed));
/* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */ #define PTRACE_GETREGS 12