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* interp.c: Fix byte-swapping code throughout to work on 

both little- and big-endian hosts.
This commit is contained in:
Mark Alexander 1996-12-29 17:47:25 +00:00
parent 2510786bd4
commit 0049ba7a8d
2 changed files with 20 additions and 9 deletions
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5
sim/mips/ChangeLog
View File

@ -1,3 +1,8 @@
Sun Dec 29 09:37:18 1996 Mark Alexander <marka@cygnus.com>
* interp.c: Fix byte-swapping code throughout to work on
both little- and big-endian hosts.
Sun Dec 29 09:18:32 1996 Mark Alexander <marka@cygnus.com>
* support.h: Make definitions of SIGTRAP and SIGQUIT consistent

24
sim/mips/interp.c
View File

@ -390,6 +390,12 @@ static ut_reg HLPC = 0;
/* UserMode */
#define UserMode ((((SR & status_KSU_mask) >> status_KSU_shift) == ksu_user) ? 1 : 0)
/* BigEndianMem */
/* Hardware configuration. Affects endianness of LoadMemory and
StoreMemory and the endianness of Kernel and Supervisor mode
execution. The value is 0 for little-endian; 1 for big-endian. */
#define BigEndianMem ((state & simBE) ? 1 : 0)
/* ByteSwapMem */
/* This is true if the host and target have different endianness. */
#define ByteSwapMem (!(state & simHOSTBE) != !(state & simBE))
@ -404,8 +410,8 @@ static ut_reg HLPC = 0;
/* The endianness for load and store instructions (0=little;1=big). In
User mode this endianness may be switched by setting the state_RE
bit in the SR register. Thus, BigEndianCPU may be computed as
(!ByteSwapMem EOR ReverseEndian). */
#define BigEndianCPU (!ByteSwapMem ^ ReverseEndian) /* Already bits */
(BigEndianMem EOR ReverseEndian). */
#define BigEndianCPU (BigEndianMem ^ ReverseEndian) /* Already bits */
#if !defined(FASTSIM) || defined(PROFILE)
/* At the moment these values will be the same, since we do not have
@ -1058,7 +1064,7 @@ sim_write (addr,buffer,size)
/* We need to perform the following magic to ensure that that
bytes are written into same byte positions in the target memory
world, regardless of the endianness of the host. */
if (!ByteSwapMem) {
if (BigEndianMem) {
value = ((uword64)(*buffer++) << 8);
value |= ((uword64)(*buffer++) << 0);
} else {
@ -1075,7 +1081,7 @@ sim_write (addr,buffer,size)
int cca;
if (AddressTranslation(vaddr,isDATA,isSTORE,&paddr,&cca,isTARGET,isRAW)) {
uword64 value;
if (!ByteSwapMem) {
if (BigEndianMem) {
value = ((uword64)(*buffer++) << 24);
value |= ((uword64)(*buffer++) << 16);
value |= ((uword64)(*buffer++) << 8);
@ -1096,7 +1102,7 @@ sim_write (addr,buffer,size)
int cca;
if (AddressTranslation(vaddr,isDATA,isSTORE,&paddr,&cca,isTARGET,isRAW)) {
uword64 value;
if (!ByteSwapMem) {
if (BigEndianMem) {
value = ((uword64)(*buffer++) << 56);
value |= ((uword64)(*buffer++) << 48);
value |= ((uword64)(*buffer++) << 40);
@ -2303,7 +2309,7 @@ LoadMemory(CCA,AccessLength,pAddr,vAddr,IorD,raw)
extracts the required bytes. However, to keep performance
high we only load the required bytes into the relevant
slots. */
if (!ByteSwapMem)
if (BigEndianMem)
switch (AccessLength) { /* big-endian memory */
case AccessLength_DOUBLEWORD :
value |= ((uword64)mem[index++] << 56);
@ -2355,7 +2361,7 @@ LoadMemory(CCA,AccessLength,pAddr,vAddr,IorD,raw)
StoreMemory routines to avoid shifting the data before
returning or using it. */
if (!raw) { /* do nothing for raw accessess */
if (!ByteSwapMem)
if (BigEndianMem)
value <<= (((7 - (pAddr & LOADDRMASK)) - AccessLength) * 8);
else /* little-endian only needs to be shifted up to the correct byte offset */
value <<= ((pAddr & LOADDRMASK) * 8);
@ -2433,7 +2439,7 @@ StoreMemory(CCA,AccessLength,MemElem,pAddr,vAddr,raw)
printf("DBG: StoreMemory: offset = %d MemElem = 0x%08X%08X\n",(unsigned int)(pAddr & LOADDRMASK),WORD64HI(MemElem),WORD64LO(MemElem));
#endif /* DEBUG */
if (!ByteSwapMem) {
if (BigEndianMem) {
if (raw)
shift = ((7 - AccessLength) * 8);
else /* real memory access */
@ -2449,7 +2455,7 @@ StoreMemory(CCA,AccessLength,MemElem,pAddr,vAddr,raw)
printf("DBG: StoreMemory: shift = %d MemElem = 0x%08X%08X\n",shift,WORD64HI(MemElem),WORD64LO(MemElem));
#endif /* DEBUG */
if (!ByteSwapMem) {
if (BigEndianMem) {
switch (AccessLength) { /* big-endian memory */
case AccessLength_DOUBLEWORD :
mem[index++] = (unsigned char)(MemElem >> 56);