u-boot/arch/arm/lib/interrupts.c
Alexander Graf cc4a474873 arm: Allow EFI payload code to take exceptions
There are 2 ways an EFI payload could return into u-boot:

  - Callback function
  - Exception

While in EFI payload mode, r9 is owned by the payload and may not contain
a valid pointer to gd, so we need to fix it up. We do that properly for the
payload to callback path already.

This patch also adds gd pointer restoral for the exception path.

Signed-off-by: Alexander Graf <agraf@suse.de>
2016-03-15 21:30:13 -04:00

223 lines
4.8 KiB
C

/*
* (C) Copyright 2003
* Texas Instruments <www.ti.com>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002-2004
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*
* (C) Copyright 2004
* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/proc-armv/ptrace.h>
#include <asm/u-boot-arm.h>
#include <efi_loader.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_USE_IRQ
int interrupt_init (void)
{
unsigned long cpsr;
/*
* setup up stacks if necessary
*/
IRQ_STACK_START = gd->irq_sp - 4;
IRQ_STACK_START_IN = gd->irq_sp + 8;
FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
__asm__ __volatile__("mrs %0, cpsr\n"
: "=r" (cpsr)
:
: "memory");
__asm__ __volatile__("msr cpsr_c, %0\n"
"mov sp, %1\n"
:
: "r" (IRQ_MODE | I_BIT | F_BIT | (cpsr & ~FIQ_MODE)),
"r" (IRQ_STACK_START)
: "memory");
__asm__ __volatile__("msr cpsr_c, %0\n"
"mov sp, %1\n"
:
: "r" (FIQ_MODE | I_BIT | F_BIT | (cpsr & ~IRQ_MODE)),
"r" (FIQ_STACK_START)
: "memory");
__asm__ __volatile__("msr cpsr_c, %0"
:
: "r" (cpsr)
: "memory");
return arch_interrupt_init();
}
/* enable IRQ interrupts */
void enable_interrupts (void)
{
unsigned long temp;
__asm__ __volatile__("mrs %0, cpsr\n"
"bic %0, %0, #0x80\n"
"msr cpsr_c, %0"
: "=r" (temp)
:
: "memory");
}
/*
* disable IRQ/FIQ interrupts
* returns true if interrupts had been enabled before we disabled them
*/
int disable_interrupts (void)
{
unsigned long old,temp;
__asm__ __volatile__("mrs %0, cpsr\n"
"orr %1, %0, #0xc0\n"
"msr cpsr_c, %1"
: "=r" (old), "=r" (temp)
:
: "memory");
return (old & 0x80) == 0;
}
#else
int interrupt_init (void)
{
/*
* setup up stacks if necessary
*/
IRQ_STACK_START_IN = gd->irq_sp + 8;
return 0;
}
void enable_interrupts (void)
{
return;
}
int disable_interrupts (void)
{
return 0;
}
#endif
void bad_mode (void)
{
panic ("Resetting CPU ...\n");
reset_cpu (0);
}
void show_regs (struct pt_regs *regs)
{
unsigned long __maybe_unused flags;
const char __maybe_unused *processor_modes[] = {
"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
"UK4_26", "UK5_26", "UK6_26", "UK7_26",
"UK8_26", "UK9_26", "UK10_26", "UK11_26",
"UK12_26", "UK13_26", "UK14_26", "UK15_26",
"USER_32", "FIQ_32", "IRQ_32", "SVC_32",
"UK4_32", "UK5_32", "UK6_32", "ABT_32",
"UK8_32", "UK9_32", "HYP_32", "UND_32",
"UK12_32", "UK13_32", "UK14_32", "SYS_32",
};
flags = condition_codes (regs);
printf("pc : [<%08lx>] lr : [<%08lx>]\n",
instruction_pointer(regs), regs->ARM_lr);
if (gd->flags & GD_FLG_RELOC) {
printf("reloc pc : [<%08lx>] lr : [<%08lx>]\n",
instruction_pointer(regs) - gd->reloc_off,
regs->ARM_lr - gd->reloc_off);
}
printf("sp : %08lx ip : %08lx fp : %08lx\n",
regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
printf ("r10: %08lx r9 : %08lx r8 : %08lx\n",
regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
printf ("Flags: %c%c%c%c",
flags & CC_N_BIT ? 'N' : 'n',
flags & CC_Z_BIT ? 'Z' : 'z',
flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
printf (" IRQs %s FIQs %s Mode %s%s\n",
interrupts_enabled (regs) ? "on" : "off",
fast_interrupts_enabled (regs) ? "on" : "off",
processor_modes[processor_mode (regs)],
thumb_mode (regs) ? " (T)" : "");
}
void do_undefined_instruction (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("undefined instruction\n");
show_regs (pt_regs);
bad_mode ();
}
void do_software_interrupt (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("software interrupt\n");
show_regs (pt_regs);
bad_mode ();
}
void do_prefetch_abort (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("prefetch abort\n");
show_regs (pt_regs);
bad_mode ();
}
void do_data_abort (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("data abort\n");
show_regs (pt_regs);
bad_mode ();
}
void do_not_used (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("not used\n");
show_regs (pt_regs);
bad_mode ();
}
void do_fiq (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("fast interrupt request\n");
show_regs (pt_regs);
bad_mode ();
}
#ifndef CONFIG_USE_IRQ
void do_irq (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("interrupt request\n");
show_regs (pt_regs);
bad_mode ();
}
#endif