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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-ppc/] [ptrace.h] - Rev 1765
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#ifndef _PPC_PTRACE_H #define _PPC_PTRACE_H /* * This struct defines the way the registers are stored on the * kernel stack during a system call or other kernel entry. * Note: the "_overhead" and "_underhead" spaces are stack locations * used by called routines. Because of the way the PowerPC ABI * specifies the function prologue/epilogue, registers can be * saved in stack locations which are below the current stack * pointer (_underhead). If an interrupt occurs during this * [albeit] small time interval, registers which were saved on * the stack could be trashed by the interrupt save code. The * "_underhead" leaves a hole just in case this happens. It also * wastes 80 bytes of stack if it doesn't! Similarly, the called * routine stores some information "above" the stack pointer before * if gets adjusted. This is covered by the "_overhead" field * and [thankfully] is not totally wasted. * */ struct pt_regs { unsigned long _overhead[14]; /* Callee's SP,LR,params */ unsigned long gpr[32]; unsigned long nip; unsigned long msr; unsigned long ctr; unsigned long link; unsigned long ccr; unsigned long xer; unsigned long dar; /* Fault registers */ unsigned long dsisr; unsigned long hash1, hash2; unsigned long imiss, dmiss; unsigned long icmp, dcmp; unsigned long orig_gpr3; /* Used for restarting system calls */ unsigned long result; /* Result of a system call */ double fpr[4]; /* Caution! Only FP0-FP3 save on interrupts */ double fpcsr; unsigned long trap; /* Reason for being here */ unsigned long marker; /* Should have DEADDEAD */ unsigned long _underhead[20]; /* Callee's register save area */ unsigned long edx; /* for binfmt_elf.c which wants edx */ }; #define instruction_pointer(regs) ((regs)->nip) #define user_mode(regs) ((regs)->msr & 0x4000) #ifdef KERNEL extern void show_regs(struct pt_regs *); #endif /* Offsets used by 'ptrace' system call interface */ /* Note: these should correspond to gpr[x] */ #define PT_R0 0 #define PT_R1 1 #define PT_R2 2 #define PT_R3 3 #define PT_R4 4 #define PT_R5 5 #define PT_R6 6 #define PT_R7 7 #define PT_R8 8 #define PT_R9 9 #define PT_R10 10 #define PT_R11 11 #define PT_R12 12 #define PT_R13 13 #define PT_R14 14 #define PT_R15 15 #define PT_R16 16 #define PT_R17 17 #define PT_R18 18 #define PT_R19 19 #define PT_R20 20 #define PT_R21 21 #define PT_R22 22 #define PT_R23 23 #define PT_R24 24 #define PT_R25 25 #define PT_R26 26 #define PT_R27 27 #define PT_R28 28 #define PT_R29 29 #define PT_R30 30 #define PT_R31 31 #define PT_NIP 32 #define PT_MSR 33 #define PT_ORIG_R3 34 #define PT_CTR 35 #define PT_LNK 36 #define PT_XER 37 #define PT_CCR 38 #define PT_FPR0 48 #endif