/* src/vm/jit/i386/md.c - machine dependent i386 functions
- Copyright (C) 1996-2005 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
+ Copyright (C) 1996-2005, 2006, 2007, 2008
+ CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
+ Copyright (C) 2009 Theobroma Systems Ltd.
This file is part of CACAO.
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., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA.
- Contact: cacao@complang.tuwien.ac.at
-
- Authors: Christian Thalinger
-
- Changes:
+*/
- $Id: md.c 3227 2005-09-19 14:03:36Z twisti $
-*/
+#include "config.h"
+#include <assert.h>
+#include <stdint.h>
#include "vm/types.h"
+#include "vm/jit/i386/codegen.h"
+
#include "vm/global.h"
+#include "vm/vm.hpp"
+
+#include "vm/jit/asmpart.h"
+#include "vm/jit/jit.hpp"
+#include "vm/jit/trap.hpp"
/* md_init *********************************************************************
void md_init(void)
{
- /* nothing to do */
+ (void) asm_md_init();
}
-/* md_stacktrace_get_returnaddress *********************************************
+/* md_jit_method_patch_address *************************************************
+
+ Gets the patch address of the currently compiled method. The offset
+ is extracted from the load instruction(s) before the jump and added
+ to the right base address (PV or REG_METHODPTR).
+
+ INVOKESTATIC/SPECIAL:
+
+ b9 30 00 49 b7 mov $0xb7490030,%ecx
+ ff d1 call *%ecx
+
+ INVOKEVIRTUAL:
+
+ 8b 08 mov (%eax),%ecx
+ 8b 91 00 00 00 00 mov 0x0(%ecx),%edx
+ ff d2 call *%edx
- Returns the return address of the current stackframe, specified by
- the passed stack pointer and the stack frame size.
+ INVOKEINTERFACE:
+
+ 8b 08 mov (%eax),%ecx
+ 8b 89 00 00 00 00 mov 0x0(%ecx),%ecx
+ 8b 91 00 00 00 00 mov 0x0(%ecx),%edx
+ ff d2 call *%edx
*******************************************************************************/
-functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
+void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
{
- functionptr ra;
+ uint8_t *pc;
+ uint16_t opcode;
+ int32_t disp;
+ void *pa; /* patch address */
+
+ /* go back to the actual call instruction (2-bytes) */
+
+ pc = ((uint8_t *) ra) - 2;
+
+ /* Get the opcode of the call. */
+
+ opcode = *((uint16_t *) pc);
+
+ /* check for the different calls */
+
+ switch (opcode) {
+ case 0xd1ff:
+ /* INVOKESTATIC/SPECIAL */
+
+ /* Patch address is 4-bytes before the call instruction. */
+
+ pa = pc - 4;
+ break;
+
+ case 0xd2ff:
+ /* INVOKEVIRTUAL/INTERFACE */
- /* on i386 the return address is above the current stack frame */
+ /* Return NULL if no mptr was specified (used for
+ replacement). */
- ra = (functionptr) *((u1 **) (sp + framesize));
+ if (mptr == NULL)
+ return NULL;
- return ra;
+ /* Get the displacement from the instruction (the displacement
+ address is 4-bytes before the call instruction). */
+
+ disp = *((int32_t *) (pc - 4));
+
+ /* Add the displacement to the method pointer. */
+
+ pa = ((uint8_t *) mptr) + disp;
+ break;
+
+ default:
+ vm_abort_disassemble(pc, 1, "md_jit_method_patch_address: unknown instruction %x", opcode);
+ return NULL;
+ }
+
+ return pa;
}
+/**
+ * Decode the trap instruction at the given PC.
+ *
+ * @param trp information about trap to be filled
+ * @param sig signal number
+ * @param xpc exception PC
+ * @param es execution state of the machine
+ * @return true if trap was decoded successfully, false otherwise.
+ */
+bool md_trap_decode(trapinfo_t* trp, int sig, void* _xpc, executionstate_t* es)
+{
+ uint8_t* xpc = (uint8_t*) _xpc;
+
+ switch (sig) {
+ case TRAP_SIGFPE:
+ // This is an ArithmeticException.
+ trp->type = TRAP_ArithmeticException;
+ trp->value = 0;
+ return true;
+
+ case TRAP_SIGILL:
+ // Check for valid trap instruction.
+ if (patcher_is_valid_trap_instruction_at(xpc)) {
+ trp->type = TRAP_PATCHER;
+ trp->value = 0;
+ return true;
+ }
+ return false;
+
+ case TRAP_SIGSEGV:
+ {
+ // Get exception-throwing instruction.
+ uint8_t opc = M_ALD_MEM_GET_OPC(xpc);
+ uint8_t mod = M_ALD_MEM_GET_MOD(xpc);
+ uint8_t rm = M_ALD_MEM_GET_RM(xpc);
+
+ // Check for hardware exception, for values
+ // see emit_mov_mem_reg and emit_mem.
+ if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
+ int32_t d = M_ALD_MEM_GET_REG(xpc);
+ int32_t disp = M_ALD_MEM_GET_DISP(xpc);
+
+ // We use the exception type as load displacement.
+ trp->type = disp;
+ trp->value = es->intregs[d];
+ return true;
+ }
+
+ // Default case is a normal NullPointerException.
+ else {
+ trp->type = TRAP_NullPointerException;
+ trp->value = 0;
+ return true;
+ }
+ }
+
+ default:
+ return false;
+ }
+}
+
+
+/* md_patch_replacement_point **************************************************
+
+ Patch the given replacement point.
+
+*******************************************************************************/
+
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
+{
+ u2 mcode;
+
+ if (revert) {
+ /* write saved machine code */
+ *(u2*)(pc) = *(u2*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u2*)(savedmcode) = *(u2*)(pc);
+
+ /* build the machine code for the patch */
+ mcode = 0x0b0f;
+
+ /* write new machine code */
+ *(u2*)(pc) = mcode;
+ }
+
+ /* XXX if required asm_cacheflush(pc,8); */
+}
+#endif /* defined(ENABLE_REPLACEMENT) */
+
/*
* 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
* c-basic-offset: 4
* tab-width: 4
* End:
+ * vim:noexpandtab:sw=4:ts=4:
*/
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