5 * This struct defines the way the registers are stored on the
6 * kernel stack during a system call or other kernel entry.
8 * this should only contain volatile regs
9 * since we can keep non-volatile in the thread_struct
10 * should set this up when only volatiles are saved
13 * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
14 * that the overall structure is a multiple of 16 bytes in length.
16 * Note that the offsets of the fields in this struct correspond with
17 * the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c.
20 #include <linux/config.h>
23 #ifdef CONFIG_PPC64BRIDGE
24 #define PPC_REG unsigned long /*long*/
26 #define PPC_REG unsigned long
32 PPC_REG orig_gpr3; /* Used for restarting system calls */
37 PPC_REG mq; /* 601 only (not used at present) */
38 /* Used on APUS to hold IPL value. */
39 PPC_REG trap; /* Reason for being here */
40 PPC_REG dar; /* Fault registers */
42 PPC_REG result; /* Result of a system call */
46 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
48 /* Size of stack frame allocated when calling signal handler. */
49 #define __SIGNAL_FRAMESIZE 64
51 #define instruction_pointer(regs) ((regs)->nip)
52 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
55 * Offsets used by 'ptrace' system call interface.
56 * These can't be changed without breaking binary compatibility
103 #define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */
104 #define PT_FPR31 (PT_FPR0 + 2*31)
105 #define PT_FPSCR (PT_FPR0 + 2*32 + 1)