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Fix jump-range constrained mcode allocation.

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Mike Pall 2013-04-05 20:22:41 +02:00
parent 389822d606
commit b5bbacdc17
1 changed files with 2 additions and 1 deletions
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3
src/lj_mcode.c
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@ -206,6 +206,7 @@ static void *mcode_alloc(jit_State *J, size_t sz)
{ {
/* Target an address in the static assembler code (64K aligned). /* Target an address in the static assembler code (64K aligned).
** Try addresses within a distance of target-range/2+1MB..target+range/2-1MB. ** Try addresses within a distance of target-range/2+1MB..target+range/2-1MB.
** Use half the jump range so every address in the range can reach any other.
*/ */
#if LJ_TARGET_MIPS #if LJ_TARGET_MIPS
/* Use the middle of the 256MB-aligned region. */ /* Use the middle of the 256MB-aligned region. */
@ -214,7 +215,7 @@ static void *mcode_alloc(jit_State *J, size_t sz)
#else #else
uintptr_t target = (uintptr_t)(void *)lj_vm_exit_handler & ~(uintptr_t)0xffff; uintptr_t target = (uintptr_t)(void *)lj_vm_exit_handler & ~(uintptr_t)0xffff;
#endif #endif
const uintptr_t range = (1u << LJ_TARGET_JUMPRANGE) - (1u << 21); const uintptr_t range = (1u << (LJ_TARGET_JUMPRANGE-1)) - (1u << 21);
/* First try a contiguous area below the last one. */ /* First try a contiguous area below the last one. */
uintptr_t hint = J->mcarea ? (uintptr_t)J->mcarea - sz : 0; uintptr_t hint = J->mcarea ? (uintptr_t)J->mcarea - sz : 0;
int i; int i;