/* registers.h: register frame declarations
*
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
/*
* notes:
*
* (1) that the members of all these structures are carefully aligned to permit
* usage of STD/STDF instructions
*
* (2) if you change these structures, you must change the code in
* arch/frvnommu/kernel/{break.S,entry.S,switch_to.S,gdb-stub.c}
*
*
* the kernel stack space block looks like this:
*
* +0x2000 +----------------------
* | union {
* | struct frv_frame0 {
* | struct user_context {
* | struct user_int_regs
* | struct user_fpmedia_regs
* | }
* | struct frv_debug_regs
* | }
* | struct pt_regs [user exception]
* | }
* +---------------------- <-- __kernel_frame0_ptr (maybe GR28)
* |
* | kernel stack
* |
* |......................
* | struct pt_regs [kernel exception]
* |...................... <-- __kernel_frame0_ptr (maybe GR28)
* |
* | kernel stack
* |
* |...................... <-- stack pointer (GR1)
* |
* | unused stack space
* |
* +----------------------
* | struct thread_info
* +0x0000 +---------------------- <-- __current_thread_info (GR15);
*
* note that GR28 points to the current exception frame
*/
#ifndef _ASM_REGISTERS_H
#define _ASM_REGISTERS_H
#ifndef __ASSEMBLY__
#define __OFFSET(X,N) ((X)+(N)*4)
#define __OFFSETC(X,N) xxxxxxxxxxxxxxxxxxxxxxxx
#else
#define __OFFSET(X,N) ((X)+(N)*4)
#define __OFFSETC(X,N) ((X)+(N))
#endif
/*****************************************************************************/
/*
* Exception/Interrupt frame
* - held on kernel stack
* - 8-byte aligned on stack (old SP is saved in frame)
* - GR0 is fixed 0, so we don't save it
*/
#ifndef __ASSEMBLY__
struct pt_regs {
unsigned long psr; /* Processor Status Register */
unsigned long isr; /* Integer Status Register */
unsigned long ccr; /* Condition Code Register */
unsigned long cccr; /* Condition Code for Conditional Insns Register */
unsigned long lr; /* Link Register */
unsigned long lcr; /* Loop Count Register */
unsigned long pc; /* Program Counter Register */
unsigned long __status; /* exception status */
unsigned long syscallno; /* syscall number or -1 */
unsigned long orig_gr8; /* original syscall arg #1 */
unsigned long gner0;
unsigned long gner1;
unsigned long long iacc0;
unsigned long tbr; /* GR0 is fixed zero, so we use this for TBR */
unsigned long sp; /* GR1: USP/KSP */
unsigned long fp; /* GR2: FP */
unsigned long gr3;
unsigned long gr4;
unsigned long gr5;
unsigned long gr6;
unsigned long gr7; /* syscall number */
unsigned long gr8; /* 1st syscall param; syscall return */
unsigned long gr9; /* 2nd syscall param */
unsigned long gr10; /* 3rd syscall param */
unsigned long gr11; /* 4th syscall param */
unsigned long gr12; /* 5th syscall param */
unsigned long gr13; /* 6th syscall param */
unsigned long gr14;
unsigned long gr15;
unsigned long gr16; /* GP pointer */
unsigned long gr17; /* small data */
unsigned long gr18; /* PIC/PID */
unsigned long gr19;
unsigned long gr20;
unsigned long gr21;
unsigned long gr22;
unsigned long gr23;
unsigned long gr24;
unsigned long gr25;
unsigned long gr26;
unsigned long gr27;
struct pt_regs *next_frame; /* GR28 - next exception frame */
unsigned long gr29; /* GR29 - OS reserved */
unsigned long gr30; /* GR30 - OS reserved */
unsigned long gr31; /* GR31 - OS reserved */
} __attribute__((aligned(8)));
#endif
#define REG__STATUS_STEP 0x00000001 /* - reenable single stepping on return */
#define REG__STATUS_STEPPED 0x00000002 /* - single step caused exception */
#define REG__STATUS_BROKE 0x00000004 /* - BREAK insn caused exception */
#define REG__STATUS_SYSC_ENTRY 0x40000000 /* - T on syscall entry (ptrace.c only) */
#define REG__STATUS_SYSC_EXIT 0x80000000 /* - T on syscall exit (ptrace.c only) */
#define REG_GR(R) __OFFSET(REG_GR0, (R))
#define REG_SP REG_GR(1)
#define REG_FP REG_GR(2)
#define REG_PREV_FRAME REG_GR(28) /* previous exception frame pointer (old gr28 value) */
#define REG_CURR_TASK REG_GR(29) /* current task */
/*****************************************************************************/
/*
* debugging registers
*/
#ifndef __ASSEMBLY__
struct frv_debug_regs
{
unsigned long dcr;
unsigned long ibar[4] __attribute__((aligned(8)));
unsigned long dbar[4] __attribute__((aligned(8)));
unsigned long dbdr[4][4] __attribute__((aligned(8)));
unsigned long dbmr[4][4] __attribute__((aligned(8)));
} __attribute__((aligned(8)));
#endif
/*****************************************************************************/
/*
* userspace registers
*/
#ifndef __ASSEMBLY__
struct user_int_regs
{
/* integer registers
* - up to gr[31] mirror pt_regs
* - total size must be multiple of 8 bytes
*/
unsigned long psr; /* Processor Status Register */
unsigned long isr; /* Integer Status Register */
unsigned long ccr; /* Condition Code Register */
unsigned long cccr; /* Condition Code for Conditional Insns Register */
unsigned long lr; /* Link Register */
unsigned long lcr; /* Loop Count Register */
unsigned long pc; /* Program Counter Register */
unsigned long __status; /* exception status */
unsigned long syscallno; /* syscall number or -1 */
unsigned long orig_gr8; /* original syscall arg #1 */
unsigned long gner[2];
unsigned long long iacc[1];
union {
unsigned long tbr;
unsigned long gr[64];
};
};
struct user_fpmedia_regs
{
/* FP/Media registers */
unsigned long fr[64];
unsigned long fner[2];
unsigned long msr[2];
unsigned long acc[8];
unsigned char accg[8];
unsigned long fsr[1];
};
struct user_context
{
struct user_int_regs i;
struct user_fpmedia_regs f;
/* we provide a context extension so that we can save the regs for CPUs that
* implement many more of Fujitsu's lavish register spec
*/
void *extension;
} __attribute__((aligned(8)));
struct frv_frame0 {
union {
struct pt_regs regs;
struct user_context uc;
};
struct frv_debug_regs debug;
} __attribute__((aligned(32)));
#endif
#define __INT_GR(R) __OFFSET(__INT_GR0, (R))
#define __FPMEDIA_FR(R) __OFFSET(__FPMEDIA_FR0, (R))
#define __FPMEDIA_FNER(R) __OFFSET(__FPMEDIA_FNER0, (R))
#define __FPMEDIA_MSR(R) __OFFSET(__FPMEDIA_MSR0, (R))
#define __FPMEDIA_ACC(R) __OFFSET(__FPMEDIA_ACC0, (R))
#define __FPMEDIA_ACCG(R) __OFFSETC(__FPMEDIA_ACCG0, (R))
#define __FPMEDIA_FSR(R) __OFFSET(__FPMEDIA_FSR0, (R))
#define __THREAD_GR(R) __OFFSET(__THREAD_GR16, (R) - 16)
#endif /* _ASM_REGISTERS_H */