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MIPS: Fix handling of spare long-range jump slots.

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Contributed by Djordje Kovacevic and Stefan Pejic.
This commit is contained in:
Mike Pall 2017-06-07 19:36:46 +02:00
parent 7381b62035
commit c7c3c4da43
3 changed files with 11 additions and 10 deletions
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9
src/lj_asm_mips.h
View File

@ -65,10 +65,9 @@ static Reg ra_alloc2(ASMState *as, IRIns *ir, RegSet allow)
static void asm_sparejump_setup(ASMState *as)
{
MCode *mxp = as->mcbot;
/* Assumes sizeof(MCLink) == 8. */
if (((uintptr_t)mxp & (LJ_PAGESIZE-1)) == 8) {
if (((uintptr_t)mxp & (LJ_PAGESIZE-1)) == sizeof(MCLink)) {
lua_assert(MIPSI_NOP == 0);
memset(mxp+2, 0, MIPS_SPAREJUMP*8);
memset(mxp, 0, MIPS_SPAREJUMP*2*sizeof(MCode));
mxp += MIPS_SPAREJUMP*2;
lua_assert(mxp < as->mctop);
lj_mcode_sync(as->mcbot, mxp);
@ -1947,7 +1946,9 @@ void lj_asm_patchexit(jit_State *J, GCtrace *T, ExitNo exitno, MCode *target)
if (!cstart) cstart = p-1;
} else { /* Branch out of range. Use spare jump slot in mcarea. */
int i;
for (i = 2; i < 2+MIPS_SPAREJUMP*2; i += 2) {
for (i = (int)(sizeof(MCLink)/sizeof(MCode));
i < (int)(sizeof(MCLink)/sizeof(MCode)+MIPS_SPAREJUMP*2);
i += 2) {
if (mcarea[i] == tjump) {
delta = mcarea+i - p;
goto patchbranch;

6
src/lj_jit.h
View File

@ -155,6 +155,12 @@ typedef uint8_t MCode;
typedef uint32_t MCode;
#endif
/* Linked list of MCode areas. */
typedef struct MCLink {
MCode *next; /* Next area. */
size_t size; /* Size of current area. */
} MCLink;
/* Stack snapshot header. */
typedef struct SnapShot {
uint16_t mapofs; /* Offset into snapshot map. */

6
src/lj_mcode.c
View File

@ -272,12 +272,6 @@ static void *mcode_alloc(jit_State *J, size_t sz)
/* -- MCode area management ----------------------------------------------- */
/* Linked list of MCode areas. */
typedef struct MCLink {
MCode *next; /* Next area. */
size_t size; /* Size of current area. */
} MCLink;
/* Allocate a new MCode area. */
static void mcode_allocarea(jit_State *J)
{