-/* src/vm/jit/x86_64/md.c - machine dependent x86_64 Linux functions
+/* src/vm/jit/x86_64/md.c - machine dependent x86_64 functions
- Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
+ 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
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
-
- Changes: Edwin Steiner
-
- $Id: md.c 6140 2006-12-07 22:45:09Z edwin $
+ $Id: md.c 7590 2007-03-28 18:54:02Z twisti $
*/
-#define _GNU_SOURCE
-
#include "config.h"
#include <assert.h>
#include <stdlib.h>
-#include <ucontext.h>
#include "vm/jit/x86_64/md-abi.h"
# include "threads/native/threads.h"
#endif
-#include "vm/exceptions.h"
-#include "vm/signallocal.h"
#include "vm/jit/asmpart.h"
+#include "vm/jit/codegen-common.h"
#include "vm/jit/stacktrace.h"
#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
-#include "vm/options.h" /* XXX debug */
+#include "vmcore/options.h" /* XXX debug */
#include "vm/jit/disass.h" /* XXX debug */
#endif
}
-/* md_signal_handler_sigsegv ***************************************************
-
- NullPointerException signal handler for hardware null pointer
- check.
-
-*******************************************************************************/
-
-void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
-{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
-
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
- different to the ones in <ucontext.h>. */
-
- sp = (u1 *) _mc->gregs[REG_RSP];
- xpc = (u1 *) _mc->gregs[REG_RIP];
- ra = xpc; /* return address is equal to xpc */
-
-#if 0
- /* check for StackOverflowException */
-
- threads_check_stackoverflow(sp);
-#endif
-
- _mc->gregs[REG_RAX] =
- (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);
-
- _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception;
-}
-
-
-/* md_signal_handler_sigfpe ****************************************************
-
- ArithmeticException signal handler for hardware divide by zero
- check.
-
-*******************************************************************************/
-
-void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
-{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
-
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
- different to the ones in <ucontext.h>. */
-
- sp = (u1 *) _mc->gregs[REG_RSP];
- xpc = (u1 *) _mc->gregs[REG_RIP];
- ra = xpc; /* return address is equal to xpc */
-
- _mc->gregs[REG_RAX] =
- (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);
-
- _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception;
-}
-
-
-/* md_signal_handler_sigusr2 ***************************************************
-
- Signal handler for profiling sampling.
-
-*******************************************************************************/
-
-#if defined(ENABLE_THREADS)
-void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
-{
- threadobject *t;
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *pc;
-
- t = THREADOBJECT;
-
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
- different to the ones in <ucontext.h>. */
-
- pc = (u1 *) _mc->gregs[REG_RIP];
-
- t->pc = pc;
-}
-#endif
-
-
-#if defined(ENABLE_THREADS)
-void thread_restartcriticalsection(ucontext_t *_uc)
-{
- mcontext_t *_mc;
- void *pc;
-
- _mc = &_uc->uc_mcontext;
-
- pc = critical_find_restart_point((void *) _mc->gregs[REG_RIP]);
-
- if (pc != NULL)
- _mc->gregs[REG_RIP] = (ptrint) pc;
-}
-#endif
-
-
-/* md_codegen_patch_branch *****************************************************
-
- Back-patches a branch instruction.
-
-*******************************************************************************/
-
-void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
-{
- s4 *mcodeptr;
- s4 disp; /* branch displacement */
-
- /* calculate the patch position */
-
- mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
-
- /* Calculate the branch displacement. */
-
- disp = targetmpc - branchmpc;
-
- /* I don't think we have to check for branch-displacement
- overflow. +/-2GB should be enough. */
-
- /* patch the branch instruction before the mcodeptr */
-
- mcodeptr[-1] = disp;
-}
-
-
/* md_stacktrace_get_returnaddress *********************************************
Returns the return address of the current stackframe, specified by
*******************************************************************************/
-void md_patch_replacement_point(rplpoint *rp)
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
{
- u8 mcode;
+ s4 disp;
+ u8 mcode;
/* XXX this is probably unsafe! */
- /* save the current machine code */
- mcode = *(u8*)rp->pc;
+ if (index < 0) {
+ /* write spinning instruction */
+ *(u2*)(rp->pc) = 0xebfe;
- /* write spinning instruction */
- *(u2*)(rp->pc) = 0xebfe;
+ /* write 5th byte */
+ rp->pc[4] = savedmcode[4];
- /* write 5th byte */
- rp->pc[4] = (rp->mcode >> 32);
+ /* write first word */
+ *(u4*)(rp->pc) = *(u4*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u4*)(savedmcode) = *(u4*)(rp->pc);
+ savedmcode[4] = rp->pc[4];
- /* write first word */
- *(u4*)(rp->pc) = (u4) rp->mcode;
+ /* build the machine code for the patch */
+ disp = (code->replacementstubs - rp->pc)
+ + index * REPLACEMENT_STUB_SIZE
+ - 5;
- /* store saved mcode */
- rp->mcode = mcode;
-
-#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+ mcode = 0xe9 | ((u8) disp << 8);
+
+ /* write spinning instruction */
+ *(u2*)(rp->pc) = 0xebfe;
+
+ /* write 5th byte */
+ rp->pc[4] = (mcode >> 32);
+
+ /* write first word */
+ *(u4*)(rp->pc) = (u4) mcode;
+ }
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
{
u1* u1ptr = rp->pc;
DISASSINSTR(u1ptr);
/* XXX if required asm_cacheflush(rp->pc,8); */
}
+#endif /* defined(ENABLE_REPLACEMENT) */
/*
* These are local overrides for various environment variables in Emacs.
projects / cacao.git / blobdiff