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systemtap
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regs-ia64.c
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/* -*- linux-c -*- * IA64 register access functions * Copyright (C) 2005 Intel Corporation. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ #ifndef _REGS_IA64_C_ #define _REGS_IA64_C_ #if defined __ia64__ struct ia64_stap_get_arbsp_param { unsigned long ip; unsigned long *address; }; static void ia64_stap_get_arbsp(struct unw_frame_info *info, void *arg) { unsigned long ip; struct ia64_stap_get_arbsp_param *lp = arg; do { unw_get_ip(info, &ip); if (ip == 0) break; if (ip == lp->ip) { unw_get_bsp(info, (unsigned long*)&lp->address); return; } } while (unw_unwind(info) >= 0); lp->address = 0; } /* * bspcache: get cached unwound address from current BSP and * set a static local cache of the offset of unwound address * if the static local cache(variable) is not set. * The unwound address means the BSP value when the kprobe * was hit. This macro stores the difference of BSP between * when the kprobe was hit and when this macro was called. * Since the difference depends on how much stack is consumed * from when the kprobe was hit, this macro *MUST NOT* be put * on the path which several functions execute (in that case, * each time the difference is changed and this macro can't * return correct unwound address). */ #define bspcache(cache, regs)\ if(regs) {\ static unsigned __offset = 0; /* probe local cache */\ static void * __ip = NULL; /* reference ip */\ unsigned long *bsp;\ asm volatile("{ flushrs }\n"); /* flushrs for fixing bsp */\ bsp = (void*)ia64_getreg(_IA64_REG_AR_BSP);\ if (__offset == 0) {\ struct ia64_stap_get_arbsp_param pa;\ pa.ip = regs->cr_iip;\ unw_init_running(ia64_stap_get_arbsp, &pa);\ if (pa.address != 0) {\ __offset = ia64_rse_num_regs(pa.address, bsp)\ -(regs->cr_ifs & 127);\ __ip = (void *)REG_IP(regs);\ cache = pa.address;\ }\ } else if ((void *)REG_IP(regs) == __ip)\ cache = ia64_rse_skip_regs(bsp,\ -(__offset + (regs->cr_ifs & 127)));\ } static long * __ia64_fetch_register(int regno, struct pt_regs *pt_regs, unsigned long **cache) { struct ia64_stap_get_arbsp_param pa; if (regno == 12) return &pt_regs->r12; if (regno >= 8 && regno <= 11) return (long *)(&pt_regs->r8 + regno - 8); else if (regno < 32 || regno > 127) return NULL; if (!*cache) { pa.ip = pt_regs->cr_iip; unw_init_running(ia64_stap_get_arbsp, &pa); if (pa.address == 0) return NULL; *cache = pa.address; } return ia64_rse_skip_regs(*cache, regno-32); } static long ia64_fetch_register(int regno, struct pt_regs *pt_regs, unsigned long **cache) { long *reg; reg = __ia64_fetch_register(regno, pt_regs, cache); return (reg != NULL)? *reg : 0; } static void ia64_store_register(int regno, struct pt_regs *pt_regs, unsigned long value) { struct ia64_stap_get_arbsp_param pa; unsigned long rsc_save = 0; unsigned long *addr; if (regno >= 8 && regno <= 11) { addr =&pt_regs->r8; addr += regno - 8; *(addr) = value; return; } else if (regno < 32 || regno > 127) return; pa.ip = pt_regs->cr_iip; unw_init_running(ia64_stap_get_arbsp, &pa); if (pa.address == 0) return; *ia64_rse_skip_regs(pa.address, regno-32) = value; //Invalidate all stacked registers outside the current frame asm volatile( "mov %0=ar.rsc;;\n\t" "mov ar.rsc=0;;\n\t" "{\n\tloadrs;;\n\t\n\t\n\t}\n\t" "mov ar.rsc=%1\n\t" :"=r" (rsc_save):"r" (rsc_save):"memory"); return; } #endif /* if defined __ia64__ */ #endif /* _REGS_IA64_C_ */