/* src/vm/jit/m68k/patcher.c - m68k patcher functions Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel, C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger, Institut f. Computersprachen - TU Wien This file is part of CACAO. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include #include #include "vm/types.h" #include "mm/memory.h" #include "native/native.h" #include "vm/builtin.h" #include "vm/exceptions.h" #include "vm/initialize.h" #include "vm/resolve.h" #include "vm/jit/asmpart.h" #include "vm/jit/patcher-common.h" #include "vm/jit/md.h" #include "vm/jit/stacktrace.h" #include "vmcore/class.h" #include "vmcore/field.h" #include "vmcore/options.h" #include "vmcore/references.h" #include "codegen.h" /* patcher_wrapper ************************************************************* Wrapper for all patchers. It also creates the stackframe info structure. If the return value of the patcher function is false, it gets the exception object, clears the exception pointer and returns the exception. *******************************************************************************/ #if 0 java_objectheader *patcher_wrapper(u1 *sp, u1 *pv, u1 *ra) { stackframeinfo_t sfi; u1 *xpc; java_objectheader *o; functionptr f; bool result; java_objectheader *e; /* define the patcher function */ bool (*patcher_function)(u1 *); /* get stuff from the stack */ xpc = (u1 *) *((ptrint *) (sp + 6 * 4)); /* REG_ITMP3 sp + 5 * 4 */ o = (java_objectheader *) *((ptrint *) (sp + 4 * 4)); /*mcode = *((u4*) (sp + 3 * 4));*/ /*xmcode = *((u4*) (sp + 2 * 4));*/ /* unresolved file sp + 1 * 4 */ f = (functionptr) *((ptrint *) (sp + 0 * 4)); /* calculate and set the new return address */ xpc = xpc - PATCHER_CALL_SIZE; *((ptrint *) (sp + 6 * 4)) = (ptrint) xpc; /* cast the passed function to a patcher function */ patcher_function = (bool (*)(u1 *)) (ptrint) f; /* enter a monitor on the patching position */ PATCHER_MONITORENTER; /* create the stackframeinfo */ /* RA is passed as NULL, but the XPC is correct and can be used in stacktrace_stackframeinfo_add for md_codegen_get_pv_from_pc. */ /* fprintf(stderr, "EXT STACKFRAME: sfi=%x pv=%x, sp=%x, xpc=%x\n", &sfi, pv, sp+7*4, xpc); */ stacktrace_stackframeinfo_add(&sfi, pv, sp + 7 * 4, xpc, xpc); /* call the proper patcher function */ result = (patcher_function)(sp); /* remove the stackframeinfo */ stacktrace_stackframeinfo_remove(&sfi); /* check for return value and exit accordingly */ if (result == false) { e = exceptions_get_and_clear_exception(); PATCHER_MONITOREXIT; return e; } PATCHER_MARK_PATCHED_MONITOREXIT; return NULL; } #endif #define PATCH_BACK_ORIGINAL_MCODE *((u8*)(pr->mpc)) = pr->mcode /* patcher_initialize_class **************************************************** just patch back original code *******************************************************************************/ void patcher_patch_code(patchref_t *pr) { #if 0 u1* xpc = (u1 *) *((ptrint *) (sp + 6 * 4)); u4 mcode = *((u4*) (sp + 3 * 4)); u4 xmcode = *((u4*) (sp + 2 * 4)); *((u4*)(xpc)) = mcode; *((u4*)(xpc+4)) = xmcode; #endif PATCH_BACK_ORIGINAL_MCODE; md_icacheflush((void*)pr->mpc, 8); } #if 0 /* patcher_initialize_class **************************************************** Initalizes a given classinfo pointer. This function does not patch any data. *******************************************************************************/ bool patcher_initialize_class(patchref_t *pr) { classinfo *c; u4 xpc, mcode, xmcode; /* get stuff from the stack */ c = (classinfo *) *((ptrint *) (sp + 1 * 4)); /* check if the class is initialized */ if (!(c->state & CLASS_INITIALIZED)) if (!initialize_class(c)) return false; /* patch back original code */ patcher_patch_back(sp); return true; } #endif /* patcher_invokevirtual ******************************************************* Machine code: 0x4029bc46: 61ff 0000 00ba bsrl 0x4029bd02 0x4029bc4c: 246f 0000 moveal %sp@(0),%a2 0x4029bc50: 266a 0000 moveal %a2@(0),%a3 0x4029bc54: 246b 0000 moveal %a3@(0),%a2 <-- patch this (0) offset 0x4029bc58: 4e92 jsr %a2@ *******************************************************************************/ bool patcher_invokevirtual(patchref_t *pr) { u1 *ra; unresolved_method *um; methodinfo *m; s2 disp; /* get stuff from the stack */ ra = (u1 *) pr->mpc; um = (unresolved_method *) pr->ref; /* get the fieldinfo */ if (!(m = resolve_method_eager(um))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* if we show NOPs, we have to skip them */ if (opt_shownops) ra += PATCHER_CALL_SIZE; assert( *((u2*)(ra+8)) == 0x286b); /* patch vftbl index */ disp = (OFFSET(vftbl_t, table[0]) + sizeof(methodptr) * m->vftblindex); *((s2 *) (ra + 10)) = disp; /* synchronize instruction cache */ md_icacheflush(ra + 10, 2); return true; } /* patcher_invokestatic_special ************************************************ Machine code: INVOKESPECIAL 0x402902bc: 61ff 0000 0076 bsrl 0x40290334 0x402902c2: 247c 0000 0000 moveal #0,%a2 <-- this #0 0x402902c8: 4e92 jsr %a2@ ******************************************************************************/ bool patcher_invokestatic_special(patchref_t *pr) { unresolved_method *um; s4 disp; methodinfo *m; /* get stuff from the stack */ disp = pr->mpc; um = (unresolved_method *) pr->ref; /* get the fieldinfo */ if (!(m = resolve_method_eager(um))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* patch stubroutine */ if (opt_shownops) disp += PATCHER_CALL_SIZE; *((ptrint *) (disp+2)) = (ptrint) m->stubroutine; /* synchronize inst cache */ md_icacheflush((void*)(disp+2), SIZEOF_VOID_P); return true; } #if 0 /* patcher_resolve_class ******************************************************* Resolves a given unresolved_class pointer. This function does not patch any data. *******************************************************************************/ #ifdef ENABLE_VERIFIER bool patcher_resolve_class(patchref_t *pr) { unresolved_class *uc; classinfo *c; s4 disp; /* get stuff from the stack */ uc = (unresolved_class *) *((ptrint *) (sp + 1 * 4)); disp = *((s4 *) (sp + 6 * 4)); /* resolve the class */ if (!resolve_class(uc, resolveEager, false, &c)) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; return true; } #endif /* ENABLE_VERIFIER */ #endif /* patcher_resolve_classref_to_classinfo *************************************** ACONST: 0x4028f2ca: 2479 0000 0000 moveal 0x00000000,%a2 *******************************************************************************/ bool patcher_resolve_classref_to_classinfo(patchref_t *pr) { constant_classref *cr; s4 disp; u1 *pv; classinfo *c; /* get stuff from the stack */ cr = (constant_classref *) pr->ref; disp = pr->mpc; /* get the classinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* patch the classinfo pointer */ if (opt_shownops) disp += PATCHER_CALL_SIZE; *((ptrint *) (disp+2)) = (ptrint) c; /* synchronize inst cache */ md_icacheflush(disp+2, SIZEOF_VOID_P); return true; } /* patcher_get_putstatic ******************************************************* Machine code: *******************************************************************************/ bool patcher_get_putstatic(patchref_t *pr) { unresolved_field *uf; s4 disp; fieldinfo *fi; /* get stuff from the stack */ uf = (unresolved_field *) pr->ref; disp = pr->mpc; /* get the fieldinfo */ if (!(fi = resolve_field_eager(uf))) return false; /* check if the field's class is initialized */ if (!(fi->class->state & CLASS_INITIALIZED)) if (!initialize_class(fi->class)) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* patch the field value's address */ if (opt_shownops) disp += PATCHER_CALL_SIZE; assert(*((uint16_t*)(disp)) == 0x247c); *((intptr_t *) (disp+2)) = (intptr_t) fi->value; /* synchronize inst cache */ md_icacheflush((void*)(disp+2), SIZEOF_VOID_P); return true; } /* patcher_get_putfield ******************************************************** Machine code: *******************************************************************************/ bool patcher_get_putfield(patchref_t *pr) { u1 *ra; unresolved_field *uf; fieldinfo *fi; ra = (u1 *) pr->mpc; uf = (unresolved_field *) pr->ref; /* get the fieldinfo */ if (!(fi = resolve_field_eager(uf))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* if we show NOPs, we have to skip them */ if (opt_shownops) ra += PATCHER_CALL_SIZE; /* patch the field's offset */ if (IS_LNG_TYPE(fi->type)) { /* * 0x40d05bb2: 0x25440000 movel %d4,%a2@(0) * 0x40d05bb6: 0x25430004 movel %d3,%a2@(4) * ^^^^ * both 0000 and 0004 have to be patched */ assert( (fi->offset & 0x0000ffff) == fi->offset ); assert( (*((uint32_t*)ra) & 0xffff0000) == *((uint32_t*)ra) ); assert( (*((uint32_t*)(ra+4)) & 0xffff0004) == *((uint32_t*)(ra+4)) ); *((int16_t *) (ra + 2)) = (int16_t) ((fi->offset) & 0x0000ffff); *((int16_t *) (ra + 6)) = (int16_t) ((fi->offset + 4) & 0x0000ffff); md_icacheflush(ra, 2 * 4); } else { /* Multiple cases here, int, adr, flt and dbl. */ if ( (*((uint32_t*)ra) & 0xfff00000) == 0xf2200000 ) { /* flt/dbl case * 0x40d3ddc2: 0xf22944c0 0x0000xxxx fsmoves %a1@(0),%fp1 * ^^^^ * patch here */ assert( (fi->offset & 0x0000ffff) == fi->offset ); assert( (*((uint32_t*)(ra+4)) & 0x0000ffff) == *((uint32_t*)(ra+4)) ); *((int16_t*)(ra+4)) = (int16_t)fi->offset; md_icacheflush(ra+4, 1 * 4); } else { /* int/adr case * 0x40adb3f6: 0x254d0000 movel %a5,%a2@(0) * ^^^^ ^ * to be patched */ assert( (*((uint32_t*)ra) & 0xffff0000) == *((uint32_t*)ra) ); assert( (fi->offset & 0x0000ffff) == fi->offset ); *((int16_t*)(ra+2)) = (int16_t)fi->offset; /* synchronize instruction cache */ md_icacheflush(ra, 1 * 4); } } return true; } /* patcher_resolve_classref_to_flags ******************************************* CHECKCAST/INSTANCEOF: CHECKCAST: 0x4029b056: 61ff 0000 013e bsrl 0x4029b196 0x4029b05c: 263c 0000 0000 movel #0,%d3 <-- patch this #0 0x4029b062: 0283 0000 0200 andil #512,%d3 INSTANCEOF: 0x402a4aa8: 61ff 0000 05c4 bsrl 0x402a506e 0x402a4aae: 283c 0000 0000 movel #0,%d4 <-- same here 0x402a4ab4: 0284 0000 0200 andil #512,%d4 *******************************************************************************/ bool patcher_resolve_classref_to_flags(patchref_t *pr) { constant_classref *cr; s4 disp; classinfo *c; /* get stuff from the stack */ cr = (constant_classref *) pr->ref; disp = pr->mpc; /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* patch class flags */ if (opt_shownops) disp += PATCHER_CALL_SIZE; assert( (*((u2*)(disp)) == 0x263c) || (*((u2*)(disp)) == 0x283c) ); *((s4 *) (disp + 2)) = (s4) c->flags; /* synchronize insn cache */ md_icacheflush((void*)(disp + 2), SIZEOF_VOID_P); return true; } /* patcher_resolve_classref_to_vftbl ******************************************* CHECKCAST (class): 0x4029b094: 61ff 0000 00b4 bsrl 0x4029b14a 0x4029b09a: 287c 0000 0000 moveal #0,%a4 <-- patch this #0 0x4029b0a0: 2668 0000 moveal %a0@(0),%a3 INSTANCEOF (class): 0x402a9300: 61ff 0000 0574 bsrl 0x402a9876 0x402a9306: 267c 0000 0000 moveal #0,%a3 0x402a930c: 246a 0000 moveal %a2@(0),%a2 *******************************************************************************/ bool patcher_resolve_classref_to_vftbl(patchref_t *pr) { constant_classref *cr; s4 disp; classinfo *c; /* get stuff from the stack */ cr = (constant_classref *) pr->ref; disp = pr->mpc; /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* patch super class' vftbl */ if (opt_shownops) disp += PATCHER_CALL_SIZE; assert( (*((u2*)disp) == 0x287c) || (*((u2*)disp)== 0x267c) ); *((s4 *) (disp+2)) = (s4) c->vftbl; /* synchronize insin cache */ md_icacheflush((void*)(disp+2), SIZEOF_VOID_P); return true; } /* patcher_instanceof_interface ************************************************ Machine code: 0x402a92da: 61ff 0000 05c0 bsrl 0x402a989c 0x402a92e0: 246a 0000 moveal %a2@(0),%a2 0x402a92e4: 282a 0010 movel %a2@(16),%d4 0x402a92e8: d8bc 0000 0000 addl #0,%d4 <-- this const 0x402a92ee: 4a84 tstl %d4 0x402a92f0: 6e0a bles 0x402a92fc 0x402a92f2: 246a 0000 moveal %a2@(0),%a2 <-- this offset *******************************************************************************/ bool patcher_instanceof_interface(patchref_t *pr) { u1 *ra; constant_classref *cr; classinfo *c; s4 disp; /* get stuff from the stack */ ra = (u1 *) pr->mpc; cr = (constant_classref *) pr->ref; /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* if we show NOPs, we have to skip them */ if (opt_shownops) ra += PATCHER_CALL_SIZE; /* patch super class index */ disp = -(c->index); assert( *((u2*)(ra + 8)) == 0xd8bc ); *((s4 *) (ra + 10 )) = disp; disp = OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*); assert( (s2)disp == disp); assert ( *((s2*)(ra+18)) == 0x246a ); *((s2 *) (ra + 20)) = disp; /* synchronize instruction cache */ md_icacheflush((void*)(ra + 10), 12); return true; } /* patcher_checkcast_interface ************************************************* 0x402a9400: 61ff 0000 03b6 bsrl 0x402a97b8 0x402a9406: 266a 0000 moveal %a2@(0),%a3 0x402a940a: 282b 0010 movel %a3@(16),%d4 0x402a940e: d8bc 0000 0000 addl #0,%d4 <-- this 0 0x402a9414: 4a84 tstl %d4 0x402a9416: 6e02 bgts 0x402a941a 1234 tstb %d0 0x402a9418: 4afc illegal 0x402a941a: 286b 0000 moveal %a3@(0),%a4 <-- and this 0 offset *******************************************************************************/ bool patcher_checkcast_interface(patchref_t *pr) { u1 *ra; constant_classref *cr; classinfo *c; s4 disp; /* get stuff from the stack */ ra = (u1 *) pr->mpc; cr = (constant_classref *) pr->ref; /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* if we show NOPs, we have to skip them */ if (opt_shownops) ra += PATCHER_CALL_SIZE; /* patch super class index */ disp = -(c->index); assert ( *((u2 *)(ra + 8)) == 0xd8bc ); *((s4 *) (ra + 10)) = disp; disp = OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*); assert( *((u2 *)(ra + 22)) == 0x286b ); assert( (s2)disp == disp); *((s2 *) (ra + 24)) = disp; /* synchronize instruction cache */ md_icacheflush((void*)(ra + 10), 16); return true; } #if 0 /* patcher_resolve_native_function ********************************************* XXX *******************************************************************************/ bool patcher_resolve_native_function(patchref_t *pr) { methodinfo *m; s4 disp; functionptr f; /* get stuff from the stack */ m = (methodinfo *) pr->ref; disp = pr->mpc; /* resolve native function */ if (!(f = native_resolve_function(m))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* patch native function pointer */ if (opt_shownops) disp += PATCHER_CALL_SIZE; *((ptrint *) (disp + 2)) = (ptrint) f; /* synchronize data cache */ md_icacheflush((void*)(disp + 2), SIZEOF_VOID_P); return true; } #endif /* patcher_invokeinterface ***************************************************** Machine code: 0x40adb03e: moveal %a2@(0),%a3 0x266a0000 <-- no patching 0x40adb042: moveal %a3@(0),%a3 0x266b0000 <-- patch this 0000 0x40adb046: moveal %a3@(0),%a4 0xxxxx0000 <-- patch this 0000 0x40adb04a: jsr %a4@ 0xxxxx *******************************************************************************/ bool patcher_invokeinterface(patchref_t *pr) { u1 *ra; unresolved_method *um; methodinfo *m; s4 disp; /* get stuff from the stack */ ra = (u1 *) pr->mpc; um = (unresolved_method *) pr->ref; /* get the fieldinfo */ if (!(m = resolve_method_eager(um))) return false; /* patch back original code */ PATCH_BACK_ORIGINAL_MCODE; /* if we show NOPs, we have to skip them */ if (opt_shownops) ra += PATCHER_CALL_SIZE; assert( *((uint32_t*)ra) == 0x246f0000 ); /* patch interfacetable index (first #0) */ disp = OFFSET(vftbl_t, interfacetable[0]) - sizeof(methodptr*) * m->class->index; /* XXX this disp is negative, check! * assert( (disp & 0x0000ffff) == disp);*/ *((uint16_t *) (ra + 5 * 2)) = disp; /* patch method offset (second #0) */ disp = sizeof(methodptr) * (m - m->class->methods); assert( (disp & 0x0000ffff) == disp); *((uint16_t *) (ra + 7 * 2)) = disp; /* synchronize instruction cache */ md_icacheflush((void*)(ra + 5 * 2), 2 * 2); return true; } /* * These are local overrides for various environment variables in Emacs. * Please do not remove this and leave it at the end of the file, where * Emacs will automagically detect them. * --------------------------------------------------------------------- * Local variables: * mode: c * indent-tabs-mode: t * c-basic-offset: 4 * tab-width: 4 * End: * vim:noexpandtab:sw=4:ts=4: */