#ifndef _PPC_PTRACE_H
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#ifndef _PPC_PTRACE_H
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#define _PPC_PTRACE_H
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#define _PPC_PTRACE_H
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/*
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/*
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* This struct defines the way the registers are stored on the
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* This struct defines the way the registers are stored on the
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* kernel stack during a system call or other kernel entry.
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* kernel stack during a system call or other kernel entry.
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* Note: the "_overhead" and "_underhead" spaces are stack locations
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* Note: the "_overhead" and "_underhead" spaces are stack locations
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* used by called routines. Because of the way the PowerPC ABI
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* used by called routines. Because of the way the PowerPC ABI
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* specifies the function prologue/epilogue, registers can be
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* specifies the function prologue/epilogue, registers can be
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* saved in stack locations which are below the current stack
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* saved in stack locations which are below the current stack
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* pointer (_underhead). If an interrupt occurs during this
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* pointer (_underhead). If an interrupt occurs during this
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* [albeit] small time interval, registers which were saved on
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* [albeit] small time interval, registers which were saved on
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* the stack could be trashed by the interrupt save code. The
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* the stack could be trashed by the interrupt save code. The
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* "_underhead" leaves a hole just in case this happens. It also
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* "_underhead" leaves a hole just in case this happens. It also
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* wastes 80 bytes of stack if it doesn't! Similarly, the called
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* wastes 80 bytes of stack if it doesn't! Similarly, the called
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* routine stores some information "above" the stack pointer before
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* routine stores some information "above" the stack pointer before
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* if gets adjusted. This is covered by the "_overhead" field
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* if gets adjusted. This is covered by the "_overhead" field
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* and [thankfully] is not totally wasted.
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* and [thankfully] is not totally wasted.
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*
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*
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*/
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*/
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struct pt_regs {
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struct pt_regs {
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unsigned long _overhead[14]; /* Callee's SP,LR,params */
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unsigned long _overhead[14]; /* Callee's SP,LR,params */
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unsigned long gpr[32];
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unsigned long gpr[32];
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unsigned long nip;
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unsigned long nip;
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unsigned long msr;
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unsigned long msr;
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unsigned long ctr;
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unsigned long ctr;
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unsigned long link;
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unsigned long link;
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unsigned long ccr;
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unsigned long ccr;
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unsigned long xer;
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unsigned long xer;
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unsigned long dar; /* Fault registers */
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unsigned long dar; /* Fault registers */
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unsigned long dsisr;
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unsigned long dsisr;
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unsigned long hash1, hash2;
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unsigned long hash1, hash2;
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unsigned long imiss, dmiss;
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unsigned long imiss, dmiss;
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unsigned long icmp, dcmp;
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unsigned long icmp, dcmp;
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unsigned long orig_gpr3; /* Used for restarting system calls */
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unsigned long orig_gpr3; /* Used for restarting system calls */
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unsigned long result; /* Result of a system call */
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unsigned long result; /* Result of a system call */
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double fpr[4]; /* Caution! Only FP0-FP3 save on interrupts */
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double fpr[4]; /* Caution! Only FP0-FP3 save on interrupts */
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double fpcsr;
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double fpcsr;
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unsigned long trap; /* Reason for being here */
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unsigned long trap; /* Reason for being here */
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unsigned long marker; /* Should have DEADDEAD */
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unsigned long marker; /* Should have DEADDEAD */
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unsigned long _underhead[20]; /* Callee's register save area */
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unsigned long _underhead[20]; /* Callee's register save area */
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unsigned long edx; /* for binfmt_elf.c which wants edx */
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unsigned long edx; /* for binfmt_elf.c which wants edx */
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};
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};
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#define instruction_pointer(regs) ((regs)->nip)
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#define instruction_pointer(regs) ((regs)->nip)
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#define user_mode(regs) ((regs)->msr & 0x4000)
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#define user_mode(regs) ((regs)->msr & 0x4000)
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#ifdef KERNEL
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#ifdef KERNEL
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extern void show_regs(struct pt_regs *);
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extern void show_regs(struct pt_regs *);
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#endif
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#endif
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/* Offsets used by 'ptrace' system call interface */
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/* Offsets used by 'ptrace' system call interface */
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/* Note: these should correspond to gpr[x] */
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/* Note: these should correspond to gpr[x] */
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#define PT_R0 0
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#define PT_R0 0
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#define PT_R1 1
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#define PT_R1 1
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#define PT_R2 2
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#define PT_R2 2
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#define PT_R3 3
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#define PT_R3 3
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#define PT_R4 4
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#define PT_R4 4
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#define PT_R5 5
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#define PT_R5 5
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#define PT_R6 6
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#define PT_R6 6
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#define PT_R7 7
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#define PT_R7 7
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#define PT_R8 8
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#define PT_R8 8
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#define PT_R9 9
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#define PT_R9 9
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#define PT_R10 10
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#define PT_R10 10
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#define PT_R11 11
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#define PT_R11 11
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#define PT_R12 12
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#define PT_R12 12
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#define PT_R13 13
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#define PT_R13 13
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#define PT_R14 14
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#define PT_R14 14
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#define PT_R15 15
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#define PT_R15 15
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#define PT_R16 16
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#define PT_R16 16
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#define PT_R17 17
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#define PT_R17 17
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#define PT_R18 18
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#define PT_R18 18
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#define PT_R19 19
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#define PT_R19 19
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#define PT_R20 20
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#define PT_R20 20
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#define PT_R21 21
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#define PT_R21 21
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#define PT_R22 22
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#define PT_R22 22
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#define PT_R23 23
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#define PT_R23 23
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#define PT_R24 24
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#define PT_R24 24
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#define PT_R25 25
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#define PT_R25 25
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#define PT_R26 26
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#define PT_R26 26
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#define PT_R27 27
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#define PT_R27 27
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#define PT_R28 28
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#define PT_R28 28
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#define PT_R29 29
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#define PT_R29 29
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#define PT_R30 30
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#define PT_R30 30
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#define PT_R31 31
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#define PT_R31 31
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#define PT_NIP 32
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#define PT_NIP 32
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#define PT_MSR 33
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#define PT_MSR 33
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#define PT_ORIG_R3 34
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#define PT_ORIG_R3 34
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#define PT_CTR 35
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#define PT_CTR 35
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#define PT_LNK 36
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#define PT_LNK 36
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#define PT_XER 37
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#define PT_XER 37
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#define PT_CCR 38
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#define PT_CCR 38
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#define PT_FPR0 48
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#define PT_FPR0 48
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#endif
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#endif
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