1. 根目录:
2. arch
3. um
4. sys-ppc
5. shared
6. sysdep
7. ptrace.h

/* 
 * Licensed under the GPL
 */

#ifndef __SYS_PTRACE_PPC_H
#define __SYS_PTRACE_PPC_H

#include <linux/types.h>

/* the following taken from <asm-ppc/ptrace.h> */

#ifdef CONFIG_PPC64
#define PPC_REG unsigned long /*long*/
#else
#define PPC_REG unsigned long
#endif
struct sys_pt_regs_s {
	PPC_REG gpr[32];
	PPC_REG nip;
	PPC_REG msr;
	PPC_REG orig_gpr3;	/* Used for restarting system calls */
	PPC_REG ctr;
	PPC_REG link;
	PPC_REG xer;
	PPC_REG ccr;
	PPC_REG mq;		/* 601 only (not used at present) */
				/* Used on APUS to hold IPL value. */
	PPC_REG trap;		/* Reason for being here */
	PPC_REG dar;		/* Fault registers */
	PPC_REG dsisr;
	PPC_REG result; 	/* Result of a system call */
};

#define NUM_REGS (sizeof(struct sys_pt_regs_s) / sizeof(PPC_REG))

struct sys_pt_regs {
    PPC_REG regs[sizeof(struct sys_pt_regs_s) / sizeof(PPC_REG)];
};

#define UM_MAX_REG (PT_FPR0)
#define UM_MAX_REG_OFFSET (UM_MAX_REG * sizeof(PPC_REG))

#define EMPTY_REGS { { [ 0 ... NUM_REGS - 1] = 0 } }

#define UM_REG(r, n) ((r)->regs[n])

#define UM_SYSCALL_RET(r) UM_REG(r, PT_R3)
#define UM_SP(r) UM_REG(r, PT_R1)
#define UM_IP(r) UM_REG(r, PT_NIP)
#define UM_ELF_ZERO(r) UM_REG(r, PT_FPSCR)
#define UM_SYSCALL_NR(r) UM_REG(r, PT_R0)
#define UM_SYSCALL_ARG1(r) UM_REG(r, PT_ORIG_R3)
#define UM_SYSCALL_ARG2(r) UM_REG(r, PT_R4)
#define UM_SYSCALL_ARG3(r) UM_REG(r, PT_R5)
#define UM_SYSCALL_ARG4(r) UM_REG(r, PT_R6)
#define UM_SYSCALL_ARG5(r) UM_REG(r, PT_R7)
#define UM_SYSCALL_ARG6(r) UM_REG(r, PT_R8)

#define UM_SYSCALL_NR_OFFSET (PT_R0 * sizeof(PPC_REG))
#define UM_SYSCALL_RET_OFFSET (PT_R3 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG1_OFFSET (PT_R3 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG2_OFFSET (PT_R4 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG3_OFFSET (PT_R5 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG4_OFFSET (PT_R6 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG5_OFFSET (PT_R7 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG6_OFFSET (PT_R8 * sizeof(PPC_REG))
#define UM_SP_OFFSET (PT_R1 * sizeof(PPC_REG))
#define UM_IP_OFFSET (PT_NIP * sizeof(PPC_REG))
#define UM_ELF_ZERO_OFFSET (PT_R3 * sizeof(PPC_REG))

#define UM_SET_SYSCALL_RETURN(_regs, result)	        \
do {                                                    \
        if (result < 0) {				\
		(_regs)->regs[PT_CCR] |= 0x10000000;	\
		UM_SYSCALL_RET((_regs)) = -result;	\
        } else {					\
		UM_SYSCALL_RET((_regs)) = result;	\
        }                                               \
} while(0)

extern void shove_aux_table(unsigned long sp);
#define UM_FIX_EXEC_STACK(sp) shove_aux_table(sp);

/* These aren't actually defined.  The undefs are just to make sure
 * everyone's clear on the concept.
 */
#undef UML_HAVE_GETREGS
#undef UML_HAVE_GETFPREGS
#undef UML_HAVE_SETREGS
#undef UML_HAVE_SETFPREGS

#endif