diff options
Diffstat (limited to 'packages/cacao/files/cacao-arm-race.patch')
| -rw-r--r-- | packages/cacao/files/cacao-arm-race.patch | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/packages/cacao/files/cacao-arm-race.patch b/packages/cacao/files/cacao-arm-race.patch new file mode 100644 index 0000000000..a4b730df18 --- /dev/null +++ b/packages/cacao/files/cacao-arm-race.patch @@ -0,0 +1,241 @@ +Index: cacao-0.99.3/src/vm/jit/arm/linux/md-os.c +=================================================================== +--- cacao-0.99.3.orig/src/vm/jit/arm/linux/md-os.c 2008-07-07 13:36:19.000000000 +0200 ++++ cacao-0.99.3/src/vm/jit/arm/linux/md-os.c 2008-09-24 17:15:23.191805889 +0200 +@@ -2,6 +2,7 @@ + + Copyright (C) 1996-2005, 2006, 2007, 2008 + CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO ++ Copyright (C) 2008 Theobroma Systems Ltd. + + This file is part of CACAO. + +@@ -60,7 +61,7 @@ + #include "vm/jit/executionstate.h" + #include "vm/jit/stacktrace.h" + #include "vm/jit/trap.h" +- ++#include "vm/jit/patcher-common.h" + + /* md_signal_handler_sigsegv *************************************************** + +@@ -126,56 +127,52 @@ + + void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p) + { +- ucontext_t *_uc; +- scontext_t *_sc; +- u1 *pv; +- u1 *sp; +- u1 *ra; +- u1 *xpc; +- u4 mcode; +- int type; +- intptr_t val; +- void *p; +- +- _uc = (ucontext_t*) _p; +- _sc = &_uc->uc_mcontext; +- +- /* ATTENTION: glibc included messed up kernel headers we needed a +- workaround for the ucontext structure. */ +- +- pv = (u1 *) _sc->arm_ip; +- sp = (u1 *) _sc->arm_sp; +- ra = (u1 *) _sc->arm_lr; /* this is correct for leafs */ +- xpc = (u1 *) _sc->arm_pc; +- +- /* get exception-throwing instruction */ +- +- mcode = *((u4 *) xpc); +- +- /* check for undefined instruction we use */ +- +- if ((mcode & 0x0ff000f0) != 0x07f000f0) { +- log_println("md_signal_handler_sigill: unknown illegal instruction: inst=%x", mcode); +-#if defined(ENABLE_DISASSEMBLER) +- DISASSINSTR(xpc); +-#endif +- vm_abort("Aborting..."); +- } +- +- type = (mcode >> 8) & 0x0fff; +- val = *((s4 *) _sc + OFFSET(scontext_t, arm_r0)/4 + (mcode & 0x0f)); +- +- /* Handle the trap. */ +- +- p = trap_handle(type, val, pv, sp, ra, xpc, _p); +- +- /* set registers if we have an exception, continue execution +- otherwise (this is needed for patchers to work) */ +- +- if (p != NULL) { +- _sc->arm_r10 = (uintptr_t) p; +- _sc->arm_fp = (uintptr_t) xpc; +- _sc->arm_pc = (uintptr_t) asm_handle_exception; ++ int type; ++ intptr_t val; ++ void *p; ++ ucontext_t* _uc = (ucontext_t*) _p; ++ scontext_t* _sc = &_uc->uc_mcontext; ++ ++ /* ATTENTION: glibc included messed up kernel headers we needed a ++ workaround for the ucontext structure. */ ++ ++ void* pv = (void*) _sc->arm_ip; ++ void* sp = (void*) _sc->arm_sp; ++ void* ra = (void*) _sc->arm_lr; // The RA is correct for leaf methods. ++ void* xpc = (void*) _sc->arm_pc; ++ ++ // Get the exception-throwing instruction. ++ uint32_t mcode = *((uint32_t*) xpc); ++ ++ // Check if the trap instruction is valid. ++ // TODO Move this into patcher_handler. ++ if (patcher_is_valid_trap_instruction_at(xpc) == false) { ++ // Check if the PC has been patched during our way to this ++ // signal handler (see PR85). ++ // NOTE: ARM uses SIGILL for other traps too, but it's OK to ++ // do this check anyway because it will fail. ++ if (patcher_is_patched_at(xpc) == true) ++ return; ++ ++ // We have a problem... ++ log_println("md_signal_handler_sigill: Unknown illegal instruction 0x%x at 0x%x", mcode, xpc); ++ #if defined(ENABLE_DISASSEMBLER) ++ (void) disassinstr(xpc); ++ #endif ++ vm_abort("Aborting..."); ++ } ++ ++ type = (mcode >> 8) & 0x0fff; ++ val = *((int32_t*) _sc + OFFSET(scontext_t, arm_r0)/4 + (mcode & 0x0f)); ++ ++ // Handle the trap. ++ p = trap_handle(type, val, pv, sp, ra, xpc, _p); ++ ++ // Set registers if we have an exception, continue execution ++ // otherwise. ++ if (p != NULL) { ++ _sc->arm_r10 = (uintptr_t) p; ++ _sc->arm_fp = (uintptr_t) xpc; + } + } + +Index: cacao-0.99.3/src/vm/jit/arm/patcher.c +=================================================================== +--- cacao-0.99.3.orig/src/vm/jit/arm/patcher.c 2008-04-27 23:44:08.000000000 +0200 ++++ cacao-0.99.3/src/vm/jit/arm/patcher.c 2008-09-24 17:05:17.003795314 +0200 +@@ -2,6 +2,7 @@ + + Copyright (C) 1996-2005, 2006, 2007, 2008 + CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO ++ Copyright (C) 2008 Theobroma Systems Ltd. + + This file is part of CACAO. + +@@ -76,6 +77,25 @@ + PATCH_BACK_ORIGINAL_MCODE; + } + ++ ++/** ++ * Check if the trap instruction at the given PC is valid. ++ * ++ * @param pc Program counter. ++ * ++ * @return true if valid, false otherwise. ++ */ ++bool patcher_is_valid_trap_instruction_at(void* pc) ++{ ++ uint32_t mcode = *((uint32_t*) pc); ++ ++ // Check for the undefined instruction we use. ++ if ((mcode & 0x0ff000f0) != 0x07f000f0) { ++ return false; ++ } ++ ++ return true; ++} + + /* patcher_get_putstatic ******************************************************* + +Index: cacao-0.99.3/src/vm/jit/patcher-common.c +=================================================================== +--- cacao-0.99.3.orig/src/vm/jit/patcher-common.c 2008-04-28 21:52:41.000000000 +0200 ++++ cacao-0.99.3/src/vm/jit/patcher-common.c 2008-09-24 17:05:17.047796037 +0200 +@@ -2,6 +2,7 @@ + + Copyright (C) 2007, 2008 + CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO ++ Copyright (C) 2008 Theobroma Systems Ltd. + + This file is part of CACAO. + +@@ -254,6 +255,49 @@ + } + + ++/** ++ * Check if the patcher is already patched. This is done by comparing ++ * the machine instruction. ++ * ++ * @param pr Patcher structure. ++ * ++ * @return true if patched, false otherwise. ++ */ ++bool patcher_is_patched(patchref_t* pr) ++{ ++ // Validate the instruction at the patching position is the same ++ // instruction as the patcher structure contains. ++ uint32_t mcode = *((uint32_t*) pr->mpc); ++ ++ if (mcode != pr->mcode) { ++ // The code differs. ++ return false; ++ } ++ ++ return true; ++} ++ ++ ++/** ++ * ++ */ ++bool patcher_is_patched_at(void* pc) ++{ ++ codeinfo* code = code_find_codeinfo_for_pc(pc); ++ ++ // Get the patcher for the given PC. ++ patchref_t* pr = patcher_list_find(code, pc); ++ ++ if (pr == NULL) { ++ // The given PC is not a patcher position. ++ return false; ++ } ++ ++ // Validate the instruction. ++ return patcher_is_patched(pr); ++} ++ ++ + /* patcher_handler ************************************************************* + + Handles the request to patch JIT code at the given patching +Index: cacao-0.99.3/src/vm/jit/patcher-common.h +=================================================================== +--- cacao-0.99.3.orig/src/vm/jit/patcher-common.h 2008-04-27 23:44:08.000000000 +0200 ++++ cacao-0.99.3/src/vm/jit/patcher-common.h 2008-09-24 17:05:17.115800331 +0200 +@@ -73,6 +73,12 @@ + + void patcher_resolve(jitdata* jd); + ++bool patcher_is_patched(patchref_t* pr); ++bool patcher_is_patched_at(void* pc); ++ ++// MD function. ++bool patcher_is_valid_trap_instruction_at(void* pc); ++ + java_handle_t *patcher_handler(u1 *pc); + + |