/* src/vm/jit/mips/md.c - machine dependent MIPS 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 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.
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.
-
- Contact: cacao@complang.tuwien.ac.at
-
- Authors: Andreas Krall
- Reinhard Grafl
-
- Changes: Christian Thalinger
-
- $Id: md.c 3002 2005-07-12 16:02:45Z twisti $
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA.
*/
+#include "config.h"
+
#include <assert.h>
-#include <signal.h>
-#include <sys/fpu.h>
-#include <sys/mman.h>
#include <unistd.h>
+#include <sys/cachectl.h>
-#include "config.h"
+#include "vm/types.h"
-#include "vm/jit/mips/md-abi.h"
-#include "vm/jit/mips/types.h"
+#include "toolbox/logging.h"
-#include "vm/exceptions.h"
-#include "vm/stringlocal.h"
-#include "vm/jit/asmpart.h"
+#include "vm/global.h"
+#include "vm/vm.h"
+#include "vm/jit/codegen-common.h" /* REMOVEME: only for codegendata */
+#include "vm/jit/stacktrace.h"
-/* md_init *********************************************************************
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+#include "vmcore/options.h" /* XXX debug */
+#include "vm/jit/disass.h" /* XXX debug */
+#endif
+
+
+/* md_stacktrace_get_returnaddress *********************************************
- Do some machine dependent initialization.
+ Returns the return address of the current stackframe, specified by
+ the passed stack pointer and the stack frame size.
*******************************************************************************/
-void md_init(void)
+u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
{
- /* The Boehm GC initialization blocks the SIGSEGV signal. So we do a */
- /* dummy allocation here to ensure that the GC is initialized. */
-
- heap_allocate(1, 0, NULL);
+ u1 *ra;
+ /* on MIPS the return address is located on the top of the stackframe */
- /* Turn off flush-to-zero */
+ /* XXX change this if we ever want to use 4-byte stackslots */
+ /* ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); */
+ ra = *((u1 **) (sp + framesize - 8));
- {
- union fpc_csr n;
- n.fc_word = get_fpc_csr();
- n.fc_struct.flush = 0;
- set_fpc_csr(n.fc_word);
- }
+ return ra;
}
-/* signal_handler_sigsegv ******************************************************
+/* md_get_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).
- NullPointerException signal handler for hardware null pointer check.
+ INVOKESTATIC/SPECIAL:
+
+ dfdeffb8 ld s8,-72(s8)
+ 03c0f809 jalr s8
+ 00000000 nop
+
+ INVOKEVIRTUAL:
+
+ dc990000 ld t9,0(a0)
+ df3e0000 ld s8,0(t9)
+ 03c0f809 jalr s8
+ 00000000 nop
+
+ INVOKEINTERFACE:
+
+ dc990000 ld t9,0(a0)
+ df39ff90 ld t9,-112(t9)
+ df3e0018 ld s8,24(t9)
+ 03c0f809 jalr s8
+ 00000000 nop
*******************************************************************************/
-void signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
+u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u4 instr;
- ptrint addr;
+ u4 mcode;
+ s4 offset;
+ u1 *pa;
- _uc = (struct ucontext *) _p;
- _mc = &_uc->uc_mcontext;
+ /* go back to the actual load instruction (3 instructions on MIPS) */
- instr = *((u4 *) (_mc->gregs[CTX_EPC]));
- addr = _mc->gregs[(instr >> 21) & 0x1f];
+ ra -= 3 * 4;
- if (addr == 0) {
- _mc->gregs[REG_ITMP1_XPTR] = (ptrint) new_nullpointerexception();
- _mc->gregs[REG_ITMP2_XPC] = _mc->gregs[CTX_EPC];
- _mc->gregs[CTX_EPC] = (ptrint) asm_handle_exception;
+ /* get first instruction word on current PC */
- } else {
- addr += (long) ((instr << 16) >> 16);
+ mcode = *((u4 *) ra);
+
+ /* check if we have 2 instructions (lui) */
+
+ if ((mcode >> 16) == 0x3c19) {
+ /* XXX write a regression for this */
+ assert(0);
+
+ /* get displacement of first instruction (lui) */
+
+ offset = (s4) (mcode << 16);
+
+ /* get displacement of second instruction (daddiu) */
+
+ mcode = *((u4 *) (ra + 1 * 4));
+
+ assert((mcode >> 16) != 0x6739);
+
+ offset += (s2) (mcode & 0x0000ffff);
+
+ pa = NULL;
+ }
+ else {
+ /* get first instruction (ld) */
+
+ mcode = *((u4 *) ra);
- throw_cacao_exception_exit(string_java_lang_InternalError,
- "faulting address: 0x%lx at 0x%lx\n",
- addr, _mc->gregs[CTX_EPC]);
+ /* get the offset from the instruction */
+
+ offset = (s2) (mcode & 0x0000ffff);
+
+ /* check for call with REG_METHODPTR: ld s8,x(t9) */
+
+#if SIZEOF_VOID_P == 8
+ if ((mcode >> 16) == 0xdf3e) {
+#else
+ if ((mcode >> 16) == 0x8f3e) {
+#endif
+ /* in this case we use the passed method pointer */
+
+ /* return NULL if no mptr was specified (used for replacement) */
+
+ if (mptr == NULL)
+ return NULL;
+
+ pa = mptr + offset;
+ }
+ else {
+ /* in the normal case we check for a `ld s8,x(s8)' instruction */
+
+#if SIZEOF_VOID_P == 8
+ assert((mcode >> 16) == 0xdfde);
+#else
+ assert((mcode >> 16) == 0x8fde);
+#endif
+
+ /* and get the final data segment address */
+
+ pa = sfi->pv + offset;
+ }
}
+
+ return pa;
}
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
-void thread_restartcriticalsection(ucontext_t *uc)
+/* md_codegen_get_pv_from_pc ***************************************************
+
+ Machine code:
+
+ 03c0f809 jalr s8
+ 00000000 nop
+ 27feff9c addiu s8,ra,-100
+
+*******************************************************************************/
+
+u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
- void *critical;
+ u1 *pv;
+ u4 mcode;
+ s4 offset;
- critical = thread_checkcritical((void*) uc->uc_mcontext.gregs[CTX_EPC]);
+ /* get the offset of the instructions */
- if (critical)
- uc->uc_mcontext.gregs[CTX_EPC] = (ptrint) critical;
-}
+ /* get first instruction word after jump */
+
+ mcode = *((u4 *) ra);
+
+ /* check if we have 2 instructions (lui, daddiu) */
+
+ if ((mcode >> 16) == 0x3c19) {
+ /* get displacement of first instruction (lui) */
+
+ offset = (s4) (mcode << 16);
+
+ /* get displacement of second instruction (daddiu) */
+
+ mcode = *((u4 *) (ra + 1 * 4));
+
+#if SIZEOF_VOID_P == 8
+ assert((mcode >> 16) == 0x6739);
+#else
+ assert((mcode >> 16) == 0x2739);
#endif
+ offset += (s2) (mcode & 0x0000ffff);
+ }
+ else {
+ /* get offset of first instruction (daddiu) */
-void docacheflush(u1 *p, long bytelen)
-{
- u1 *e = p + bytelen;
- long psize = sysconf(_SC_PAGESIZE);
- p -= (long) p & (psize - 1);
- e += psize - ((((long) e - 1) & (psize - 1)) + 1);
- bytelen = e-p;
- mprotect(p, bytelen, PROT_READ | PROT_WRITE | PROT_EXEC);
+ mcode = *((u4 *) ra);
+
+#if SIZEOF_VOID_P == 8
+ assert((mcode >> 16) == 0x67fe);
+#else
+ assert((mcode >> 16) == 0x27fe);
+#endif
+
+ offset = (s2) (mcode & 0x0000ffff);
+ }
+
+ /* calculate PV via RA + offset */
+
+ pv = ra + offset;
+
+ return pv;
}
-/* md_stacktrace_get_returnaddress *********************************************
+/* md_cacheflush ***************************************************************
- Returns the return address of the current stackframe, specified by
- the passed stack pointer and the stack frame size.
+ Calls the system's function to flush the instruction and data
+ cache.
*******************************************************************************/
-functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
+void md_cacheflush(u1 *addr, s4 nbytes)
{
- functionptr ra;
+ cacheflush(addr, nbytes, BCACHE);
+}
- /* on MIPS the return address is located on the top of the stackframe */
- ra = (functionptr) *((u1 **) (sp + framesize - SIZEOF_VOID_P));
+/* md_icacheflush **************************************************************
- return ra;
-}
+ Calls the system's function to flush the instruction cache.
+*******************************************************************************/
-/* codegen_findmethod **********************************************************
+void md_icacheflush(u1 *addr, s4 nbytes)
+{
+ cacheflush(addr, nbytes, ICACHE);
+}
- Machine code:
- 6b5b4000 jsr (pv)
- 237affe8 lda pv,-24(ra)
+/* md_dcacheflush **************************************************************
+
+ Calls the system's function to flush the data cache.
*******************************************************************************/
-functionptr codegen_findmethod(functionptr pc)
+void md_dcacheflush(u1 *addr, s4 nbytes)
{
- u1 *ra;
- u1 *pv;
- u4 mcode;
- s2 offset;
+ cacheflush(addr, nbytes, DCACHE);
+}
- ra = (u1 *) pc;
- pv = ra;
- /* get offset of first instruction (lda) */
+/* md_patch_replacement_point **************************************************
- mcode = *((u4 *) ra);
+ Patch the given replacement point.
- if ((mcode >> 16) != 0x237a) {
- log_text("No `lda pv,x(ra)' instruction found on return address!");
- assert(0);
- }
+*******************************************************************************/
- offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp,
+ u1 *savedmcode)
+{
+ union {
+ u8 both;
+ u4 words[2];
+ } mcode;
+
+ if (index < 0) {
+ /* restore the patched-over instruction */
+ *(u8*)(rp->pc) = *(u8*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u8*)(savedmcode) = *(u8*)(rp->pc);
- /* check for second instruction (ldah) */
+ /* build the machine code for the patch */
+ assert(0); /* XXX build trap instruction below */
+ mcode.both = 0;
- mcode = *((u4 *) (ra + 1 * 4));
+ /* write the new machine code */
+ *(u8*)(rp->pc) = mcode.both;
+ }
- if ((mcode >> 16) == 0x177b) {
- offset = (s2) (mcode << 16);
- pv += offset;
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+ {
+ u1* u1ptr = rp->pc;
+ DISASSINSTR(u1ptr);
+ DISASSINSTR(u1ptr);
+ fflush(stdout);
}
+#endif
- return (functionptr) pv;
+ /* flush instruction cache */
+ md_icacheflush(rp->pc,2*4);
}
-
+#endif /* defined(ENABLE_REPLACEMENT) */
/*
* These are local overrides for various environment variables in Emacs.
* c-basic-offset: 4
* tab-width: 4
* End:
+ * vim:noexpandtab:sw=4:ts=4:
*/
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