/* src/vm/jit/alpha/md.c - machine dependent Alpha 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
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: Andreas Krall
- Reinhard Grafl
- Changes: Joseph Wenninger
- Christian Thalinger
+#include "config.h"
- $Id: md.c 3772 2005-11-23 21:36:35Z twisti $
+#include <stdint.h>
+#include <ucontext.h>
-*/
+#if defined(__LINUX__)
+# include <asm/fpu.h>
+extern unsigned long ieee_get_fp_control();
+extern void ieee_set_fp_control(unsigned long fp_control);
+#endif
-#include <assert.h>
-#include <ucontext.h>
+#include "vm/jit/alpha/codegen.h"
+#include "vm/jit/alpha/md.h"
-#include "config.h"
-#include "vm/types.h"
+#include "vm/jit/asmpart.h"
+#include "vm/jit/jit.hpp"
+#include "vm/jit/trap.h"
-#include "vm/jit/alpha/md-abi.h"
-#include "vm/exceptions.h"
-#include "vm/stringlocal.h"
-#include "vm/jit/asmpart.h"
-#include "vm/jit/stacktrace.h"
+/* global variables ***********************************************************/
+
+bool has_ext_instr_set = false; /* has instruction set extensions */
/* md_init *********************************************************************
void md_init(void)
{
- /* XXX TWISTI: do we really need this? fptest's seem to work fine */
-
#if defined(__LINUX__)
-/* Linux on Digital Alpha needs an initialisation of the ieee floating point
- control for IEEE compliant arithmetic (option -mieee of GCC). Under
- Digital Unix this is done automatically.
-*/
+ unsigned long int fpcw;
+#endif
-#include <asm/fpu.h>
+ /* check for extended instruction set */
-extern unsigned long ieee_get_fp_control();
-extern void ieee_set_fp_control(unsigned long fp_control);
+ has_ext_instr_set = !asm_md_init();
+
+#if defined(__LINUX__)
+ /* Linux on Digital Alpha needs an initialisation of the ieee
+ floating point control for IEEE compliant arithmetic (option
+ -mieee of GCC). Under Digital Unix this is done
+ automatically. */
/* initialize floating point control */
- ieee_set_fp_control(ieee_get_fp_control()
- & ~IEEE_TRAP_ENABLE_INV
- & ~IEEE_TRAP_ENABLE_DZE
-/* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
- & ~IEEE_TRAP_ENABLE_OVF);
-#endif
+ fpcw = ieee_get_fp_control();
- /* nothing to do */
-}
+ fpcw = fpcw
+ & ~IEEE_TRAP_ENABLE_INV
+ & ~IEEE_TRAP_ENABLE_DZE
+ /* We dont want underflow. */
+/* & ~IEEE_TRAP_ENABLE_UNF */
+ & ~IEEE_TRAP_ENABLE_OVF;
+/* fpcw = fpcw */
+/* | IEEE_TRAP_ENABLE_INV */
+/* | IEEE_TRAP_ENABLE_DZE */
+/* | IEEE_TRAP_ENABLE_OVF */
+/* | IEEE_TRAP_ENABLE_UNF */
+/* | IEEE_TRAP_ENABLE_INE */
+/* | IEEE_TRAP_ENABLE_DNO; */
-/* md_stacktrace_get_returnaddress *********************************************
+ ieee_set_fp_control(fpcw);
+#endif
+}
- Returns the return address of the current stackframe, specified by
- the passed stack pointer and the stack frame size.
-*******************************************************************************/
+/* md_jit_method_patch_address *************************************************
-u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
-{
- u1 *ra;
-
- /* on Alpha the return address is located on the top of the stackframe */
+ 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).
- ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P));
+ INVOKESTATIC/SPECIAL:
- return ra;
-}
+ a77bffb8 ldq pv,-72(pv)
+ 6b5b4000 jsr (pv)
+ INVOKEVIRTUAL:
-/* md_codegen_findmethod *******************************************************
+ a7900000 ldq at,0(a0)
+ a77c0000 ldq pv,0(at)
+ 6b5b4000 jsr (pv)
- Machine code:
+ INVOKEINTERFACE:
+ a7900000 ldq at,0(a0)
+ a79cff98 ldq at,-104(at)
+ a77c0018 ldq pv,24(at)
6b5b4000 jsr (pv)
- 277afffe ldah pv,-2(ra)
- 237ba61c lda pv,-23012(pv)
*******************************************************************************/
-u1 *md_codegen_findmethod(u1 *ra)
+void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
{
- u1 *pv;
- u4 mcode;
- s4 offset;
+ uint32_t *pc;
+ uint32_t mcode;
+ int opcode;
+ int base;
+ int32_t disp;
+ void *pa; /* patch address */
- pv = ra;
+ /* Go back to the load instruction (2 instructions). */
- /* get first instruction word after jump */
+ pc = ((uint32_t *) ra) - 2;
- mcode = *((u4 *) ra);
+ /* Get first instruction word. */
- /* check if we have 2 instructions (ldah, lda) */
+ mcode = pc[0];
- if ((mcode >> 16) == 0x277a) {
- /* get displacement of first instruction (ldah) */
+ /* Get opcode, base register and displacement. */
- offset = (s4) (mcode << 16);
- pv += offset;
+ opcode = M_MEM_GET_Opcode(mcode);
+ base = M_MEM_GET_Rb(mcode);
+ disp = M_MEM_GET_Memory_disp(mcode);
- /* get displacement of second instruction (lda) */
+ /* Check for short or long load (2 instructions). */
- mcode = *((u4 *) (ra + 1 * 4));
+ switch (opcode) {
+ case 0x29: /* LDQ: TODO use define */
+ switch (base) {
+ case REG_PV:
+ /* Calculate the data segment address. */
- if ((mcode >> 16) != 0x237b) {
- log_text("No `lda pv,x(pv)' instruction found on return address!");
- assert(0);
- }
+ pa = ((uint8_t *) pv) + disp;
+ break;
- offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
+ case REG_METHODPTR:
+ /* Return NULL if no mptr was specified (used for
+ replacement). */
- } else {
- /* get displacement of first instruction (lda) */
+ if (mptr == NULL)
+ return NULL;
- if ((mcode >> 16) != 0x237a) {
- log_text("No `lda pv,x(ra)' instruction found on return address!");
- assert(0);
+ /* Calculate the address in the vftbl. */
+
+ pa = ((uint8_t *) mptr) + disp;
+ break;
+
+ default:
+ vm_abort_disassemble(pc, 2, "md_jit_method_patch_address: unknown instruction %x", mcode);
+ return NULL;
}
+ break;
+
+ case 0x09: /* LDAH: TODO use define */
+ /* XXX write a regression for this */
+
+ vm_abort("md_jit_method_patch_address: IMPLEMENT ME!");
+
+ pa = NULL;
+ break;
+
+ default:
+ vm_abort_disassemble(pc, 2, "md_jit_method_patch_address: unknown instruction %x", mcode);
+ return NULL;
+ }
+
+ return pa;
+}
+
+
+/* md_patch_replacement_point **************************************************
+
+ Patch the given replacement point.
- offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
+*******************************************************************************/
+
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
+{
+ u4 mcode;
+
+ if (revert) {
+ /* restore the patched-over instruction */
+ *(u4*)(pc) = *(u4*)(savedmcode);
}
+ else {
+ /* save the current machine code */
+ *(u4*)(savedmcode) = *(u4*)(pc);
+
+ /* build the machine code for the patch */
+ mcode = (0xa41f0000 | (TRAP_PATCHER));
- return pv;
+ /* write the new machine code */
+ *(u4*)(pc) = mcode;
+ }
+
+ /* flush instruction cache */
+ md_icacheflush(pc,4);
}
+#endif /* defined(ENABLE_REPLACEMENT) */
/*
* c-basic-offset: 4
* tab-width: 4
* End:
+ * vim:noexpandtab:sw=4:ts=4:
*/
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