registers.h

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/*
 * Register definitions for the Hexagon architecture
 */


#ifndef _ASM_REGISTERS_H
#define _ASM_REGISTERS_H

#define SP r29

#ifndef __ASSEMBLY__

/*  See kernel/entry.S for further documentation.  */

/*
 * Entry code copies the event record out of guest registers into
 * this structure (which is on the stack).
 */

struct hvm_event_record {
    unsigned long vmel;     /* Event Linkage (return address) */
    unsigned long vmest;    /* Event context - pre-event SSR values */
    unsigned long vmpsp;    /* Previous stack pointer */
    unsigned long vmbadva;  /* Bad virtual address for addressing events */
};

struct pt_regs {
    long restart_r0;        /* R0 checkpoint for syscall restart */
    long syscall_nr;        /* Only used in system calls */
    union {
        struct {
            unsigned long usr;
            unsigned long preds;
        };
        long long int predsusr;
    };
    union {
        struct {
            unsigned long m0;
            unsigned long m1;
        };
        long long int m1m0;
    };
    union {
        struct {
            unsigned long sa1;
            unsigned long lc1;
        };
        long long int lc1sa1;
    };
    union {
        struct {
            unsigned long sa0;
            unsigned long lc0;
        };
        long long int lc0sa0;
    };
    union {
        struct {
            unsigned long gp;
            unsigned long ugp;
        };
        long long int ugpgp;
    };
    /*
    * Be extremely careful with rearranging these, if at all.  Some code
    * assumes the 32 registers exist exactly like this in memory;
    * e.g. kernel/ptrace.c
    * e.g. kernel/signal.c (restore_sigcontext)
    */
    union {
        struct {
            unsigned long r00;
            unsigned long r01;
        };
        long long int r0100;
    };
    union {
        struct {
            unsigned long r02;
            unsigned long r03;
        };
        long long int r0302;
    };
    union {
        struct {
            unsigned long r04;
            unsigned long r05;
        };
        long long int r0504;
    };
    union {
        struct {
            unsigned long r06;
            unsigned long r07;
        };
        long long int r0706;
    };
    union {
        struct {
            unsigned long r08;
            unsigned long r09;
        };
        long long int r0908;
    };
    union {
           struct {
            unsigned long r10;
            unsigned long r11;
           };
           long long int r1110;
    };
    union {
           struct {
            unsigned long r12;
            unsigned long r13;
           };
           long long int r1312;
    };
    union {
           struct {
            unsigned long r14;
            unsigned long r15;
           };
           long long int r1514;
    };
    union {
        struct {
            unsigned long r16;
            unsigned long r17;
        };
        long long int r1716;
    };
    union {
        struct {
            unsigned long r18;
            unsigned long r19;
        };
        long long int r1918;
    };
    union {
        struct {
            unsigned long r20;
            unsigned long r21;
        };
        long long int r2120;
    };
    union {
        struct {
            unsigned long r22;
            unsigned long r23;
        };
        long long int r2322;
    };
    union {
        struct {
            unsigned long r24;
            unsigned long r25;
        };
        long long int r2524;
    };
    union {
        struct {
            unsigned long r26;
            unsigned long r27;
        };
        long long int r2726;
    };
    union {
        struct {
            unsigned long r28;
            unsigned long r29;
           };
           long long int r2928;
    };
    union {
        struct {
            unsigned long r30;
            unsigned long r31;
        };
        long long int r3130;
    };
    /* VM dispatch pushes event record onto stack - we can build on it */
    struct hvm_event_record hvmer;
};

/* Defines to conveniently access the values  */

/*
 * As of the VM spec 0.5, these registers are now set/retrieved via a
 * VM call.  On the in-bound side, we just fetch the values
 * at the entry points and stuff them into the old record in pt_regs.
 * However, on the outbound side, probably at VM rte, we set the
 * registers back.
 */

#define pt_elr(regs) ((regs)->hvmer.vmel)
#define pt_set_elr(regs, val) ((regs)->hvmer.vmel = (val))
#define pt_cause(regs) ((regs)->hvmer.vmest & (HVM_VMEST_CAUSE_MSK))
#define user_mode(regs) \
    (((regs)->hvmer.vmest & (HVM_VMEST_UM_MSK << HVM_VMEST_UM_SFT)) != 0)
#define ints_enabled(regs) \
    (((regs)->hvmer.vmest & (HVM_VMEST_IE_MSK << HVM_VMEST_IE_SFT)) != 0)
#define pt_psp(regs) ((regs)->hvmer.vmpsp)
#define pt_badva(regs) ((regs)->hvmer.vmbadva)

#define pt_set_rte_sp(regs, sp) do {\
    pt_psp(regs) = (sp);\
    (regs)->SP = (unsigned long) &((regs)->hvmer);\
    } while (0)

#define pt_set_kmode(regs) \
    (regs)->hvmer.vmest = (HVM_VMEST_IE_MSK << HVM_VMEST_IE_SFT)

#define pt_set_usermode(regs) \
    (regs)->hvmer.vmest = (HVM_VMEST_UM_MSK << HVM_VMEST_UM_SFT) \
                | (HVM_VMEST_IE_MSK << HVM_VMEST_IE_SFT)

#endif  /*  ifndef __ASSEMBLY  */

#endif