/* src/vm/jit/i386/patcher.c - i386 code patching functions Copyright (C) 1996-2005, 2006 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. Contact: cacao@cacaojvm.org Authors: Christian Thalinger Changes: $Id: patcher.c 5233 2006-08-14 10:59:39Z twisti $ */ #include "config.h" #include "vm/types.h" #include "mm/memory.h" #include "native/native.h" #include "vm/builtin.h" #include "vm/class.h" #include "vm/exceptions.h" #include "vm/field.h" #include "vm/initialize.h" #include "vm/options.h" #include "vm/resolve.h" #include "vm/references.h" #include "vm/jit/patcher.h" #include "vm/jit/i386/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. *******************************************************************************/ java_objectheader *patcher_wrapper(u1 *sp, u1 *pv, u1 *ra) { stackframeinfo 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)); o = (java_objectheader *) *((ptrint *) (sp + 4 * 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_create_extern_stackframeinfo for md_codegen_get_pv_from_pc. */ stacktrace_create_extern_stackframeinfo(&sfi, pv, sp + 7 * 4, xpc, xpc); /* call the proper patcher function */ result = (patcher_function)(sp); /* remove the stackframeinfo */ stacktrace_remove_stackframeinfo(&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; } /* patcher_get_putstatic ******************************************************* Machine code: b8 00 00 00 00 mov $0x00000000,%eax *******************************************************************************/ bool patcher_get_putstatic(u1 *sp) { u1 *ra; u8 mcode; unresolved_field *uf; fieldinfo *fi; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); uf = (unresolved_field *) *((ptrint *) (sp + 1 * 4)); /* 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 */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the field value's address */ *((ptrint *) (ra + 1)) = (ptrint) &(fi->value); return true; } /* patcher_getfield ************************************************************ Machine code: 8b 88 00 00 00 00 mov 0x00000000(%eax),%ecx *******************************************************************************/ bool patcher_getfield(u1 *sp) { u1 *ra; u8 mcode; unresolved_field *uf; fieldinfo *fi; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); uf = (unresolved_field *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(fi = resolve_field_eager(uf))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the field's offset */ *((u4 *) (ra + 2)) = (u4) (fi->offset); /* if the field has type long, we need to patch the second move too */ if (fi->type == TYPE_LNG) *((u4 *) (ra + 6 + 2)) = (u4) (fi->offset + 4); return true; } /* patcher_putfield ************************************************************ Machine code: 8b 88 00 00 00 00 mov 0x00000000(%eax),%ecx *******************************************************************************/ bool patcher_putfield(u1 *sp) { u1 *ra; u8 mcode; unresolved_field *uf; fieldinfo *fi; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); uf = (unresolved_field *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(fi = resolve_field_eager(uf))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the field's offset */ if (fi->type != TYPE_LNG) { *((u4 *) (ra + 2)) = (u4) (fi->offset); } else { /* The long code is special: * * 89 8d 00 00 00 00 mov %ecx,0x00000000(%ebp) * 89 95 00 00 00 00 mov %edx,0x00000000(%ebp) */ *((u4 *) (ra + 2)) = (u4) (fi->offset); *((u4 *) (ra + 6 + 2)) = (u4) (fi->offset + 4); } return true; } /* patcher_putfieldconst ******************************************************* Machine code: c7 85 00 00 00 00 7b 00 00 00 movl $0x7b,0x0(%ebp) *******************************************************************************/ bool patcher_putfieldconst(u1 *sp) { u1 *ra; u8 mcode; unresolved_field *uf; fieldinfo *fi; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); uf = (unresolved_field *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(fi = resolve_field_eager(uf))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the field's offset */ if (!IS_2_WORD_TYPE(fi->type)) { *((u4 *) (ra + 2)) = (u4) (fi->offset); } else { /* long/double code is different: * * c7 80 00 00 00 00 c8 01 00 00 movl $0x1c8,0x0(%eax) * c7 80 04 00 00 00 00 00 00 00 movl $0x0,0x4(%eax) */ *((u4 *) (ra + 2)) = (u4) (fi->offset); *((u4 *) (ra + 10 + 2)) = (u4) (fi->offset + 4); } return true; } /* patcher_aconst ************************************************************** Machine code: c7 04 24 00 00 00 00 movl $0x0000000,(%esp) b8 00 00 00 00 mov $0x0000000,%eax *******************************************************************************/ bool patcher_aconst(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the classinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the classinfo pointer */ *((ptrint *) (ra + 1)) = (ptrint) c; return true; } /* patcher_builtin_multianewarray ********************************************** Machine code: c7 04 24 02 00 00 00 movl $0x2,(%esp) c7 44 24 04 00 00 00 00 movl $0x00000000,0x4(%esp) 89 e0 mov %esp,%eax 83 c0 0c add $0xc,%eax 89 44 24 08 mov %eax,0x8(%esp) b8 00 00 00 00 mov $0x00000000,%eax ff d0 call *%eax *******************************************************************************/ bool patcher_builtin_multianewarray(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the classinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the classinfo pointer */ *((ptrint *) (ra + 7 + 4)) = (ptrint) c; /* patch new function address */ *((ptrint *) (ra + 7 + 8 + 2 + 3 + 4 + 1)) = (ptrint) BUILTIN_multianewarray; return true; } /* patcher_builtin_arraycheckcast ********************************************** Machine code: c7 44 24 04 00 00 00 00 movl $0x00000000,0x4(%esp) ba 00 00 00 00 mov $0x00000000,%edx ff d2 call *%edx *******************************************************************************/ bool patcher_builtin_arraycheckcast(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the classinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch the classinfo pointer */ *((ptrint *) (ra + 4)) = (ptrint) c; /* patch new function address */ *((ptrint *) (ra + 8 + 1)) = (ptrint) BUILTIN_arraycheckcast; return true; } /* patcher_invokestatic_special ************************************************ Machine code: b9 00 00 00 00 mov $0x00000000,%ecx ff d1 call *%ecx *******************************************************************************/ bool patcher_invokestatic_special(u1 *sp) { u1 *ra; u8 mcode; unresolved_method *um; methodinfo *m; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); um = (unresolved_method *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(m = resolve_method_eager(um))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch stubroutine */ *((ptrint *) (ra + 1)) = (ptrint) m->stubroutine; return true; } /* patcher_invokevirtual ******************************************************* Machine code: 8b 08 mov (%eax),%ecx 8b 81 00 00 00 00 mov 0x00000000(%ecx),%eax ff d0 call *%eax *******************************************************************************/ bool patcher_invokevirtual(u1 *sp) { u1 *ra; u8 mcode; unresolved_method *um; methodinfo *m; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); um = (unresolved_method *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(m = resolve_method_eager(um))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch vftbl index */ *((s4 *) (ra + 2 + 2)) = (s4) (OFFSET(vftbl_t, table[0]) + sizeof(methodptr) * m->vftblindex); return true; } /* patcher_invokeinterface ***************************************************** Machine code: 8b 00 mov (%eax),%eax 8b 88 00 00 00 00 mov 0x00000000(%eax),%ecx 8b 81 00 00 00 00 mov 0x00000000(%ecx),%eax ff d0 call *%eax *******************************************************************************/ bool patcher_invokeinterface(u1 *sp) { u1 *ra; u8 mcode; unresolved_method *um; methodinfo *m; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); um = (unresolved_method *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(m = resolve_method_eager(um))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch interfacetable index */ *((s4 *) (ra + 2 + 2)) = (s4) (OFFSET(vftbl_t, interfacetable[0]) - sizeof(methodptr) * m->class->index); /* patch method offset */ *((s4 *) (ra + 2 + 6 + 2)) = (s4) (sizeof(methodptr) * (m - m->class->methods)); return true; } /* patcher_checkcast_instanceof_flags ****************************************** Machine code: b9 00 00 00 00 mov $0x00000000,%ecx *******************************************************************************/ bool patcher_checkcast_instanceof_flags(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch class flags */ *((s4 *) (ra + 1)) = (s4) c->flags; return true; } /* patcher_checkcast_instanceof_interface ************************************** Machine code: 8b 91 00 00 00 00 mov 0x00000000(%ecx),%edx 81 ea 00 00 00 00 sub $0x00000000,%edx 85 d2 test %edx,%edx 0f 8e 00 00 00 00 jle 0x00000000 8b 91 00 00 00 00 mov 0x00000000(%ecx),%edx *******************************************************************************/ bool patcher_checkcast_instanceof_interface(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch super class index */ *((s4 *) (ra + 6 + 2)) = (s4) c->index; *((s4 *) (ra + 6 + 6 + 2 + 6 + 2)) = (s4) (OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*)); return true; } /* patcher_checkcast_class ***************************************************** Machine code: ba 00 00 00 00 mov $0x00000000,%edx 8b 89 00 00 00 00 mov 0x00000000(%ecx),%ecx 8b 92 00 00 00 00 mov 0x00000000(%edx),%edx 29 d1 sub %edx,%ecx ba 00 00 00 00 mov $0x00000000,%edx *******************************************************************************/ bool patcher_checkcast_class(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch super class' vftbl */ *((ptrint *) (ra + 1)) = (ptrint) c->vftbl; *((ptrint *) (ra + 5 + 6 + 6 + 2 + 1)) = (ptrint) c->vftbl; return true; } /* patcher_instanceof_class **************************************************** Machine code: b9 00 00 00 00 mov $0x0,%ecx 8b 40 14 mov 0x14(%eax),%eax 8b 51 18 mov 0x18(%ecx),%edx 8b 49 14 mov 0x14(%ecx),%ecx *******************************************************************************/ bool patcher_instanceof_class(u1 *sp) { u1 *ra; u8 mcode; constant_classref *cr; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); cr = (constant_classref *) *((ptrint *) (sp + 1 * 4)); /* get the fieldinfo */ if (!(c = resolve_classref_eager(cr))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch super class' vftbl */ *((ptrint *) (ra + 1)) = (ptrint) c->vftbl; return true; } /* patcher_clinit ************************************************************** Is used int PUT/GETSTATIC and native stub. Machine code: *******************************************************************************/ bool patcher_clinit(u1 *sp) { u1 *ra; u8 mcode; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); 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 */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); return true; } /* patcher_athrow_areturn ****************************************************** Machine code: *******************************************************************************/ #ifdef ENABLE_VERIFIER bool patcher_athrow_areturn(u1 *sp) { u1 *ra; u8 mcode; unresolved_class *uc; classinfo *c; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); uc = (unresolved_class *) *((ptrint *) (sp + 1 * 4)); /* resolve the class */ if (!resolve_class(uc, resolveEager, false, &c)) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); return true; } #endif /* ENABLE_VERIFIER */ /* patcher_resolve_native ****************************************************** Is used in native stub. Machine code: c7 44 24 04 28 90 01 40 movl $0x40019028,0x4(%esp) *******************************************************************************/ #if !defined(WITH_STATIC_CLASSPATH) bool patcher_resolve_native(u1 *sp) { u1 *ra; u8 mcode; methodinfo *m; functionptr f; /* get stuff from the stack */ ra = (u1 *) *((ptrint *) (sp + 6 * 4)); mcode = *((u8 *) (sp + 2 * 4)); m = (methodinfo *) *((ptrint *) (sp + 1 * 4)); /* resolve native function */ if (!(f = native_resolve_function(m))) return false; /* patch back original code */ *((u4 *) (ra + 0)) = (u4) mcode; *((u1 *) (ra + 4)) = (u1) (mcode >> 32); /* if we show disassembly, we have to skip the nop's */ if (opt_showdisassemble) ra = ra + 5; /* patch native function pointer */ *((ptrint *) (ra + 4)) = (ptrint) f; return true; } #endif /* !defined(WITH_STATIC_CLASSPATH) */ /* * 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: */