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

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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
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@ -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> Sun Dec 29 09:18:32 1996 Mark Alexander <marka@cygnus.com>
* support.h: Make definitions of SIGTRAP and SIGQUIT consistent * 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 */ /* UserMode */
#define UserMode ((((SR & status_KSU_mask) >> status_KSU_shift) == ksu_user) ? 1 : 0) #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 */ /* ByteSwapMem */
/* This is true if the host and target have different endianness. */ /* This is true if the host and target have different endianness. */
#define ByteSwapMem (!(state & simHOSTBE) != !(state & simBE)) #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 /* The endianness for load and store instructions (0=little;1=big). In
User mode this endianness may be switched by setting the state_RE User mode this endianness may be switched by setting the state_RE
bit in the SR register. Thus, BigEndianCPU may be computed as bit in the SR register. Thus, BigEndianCPU may be computed as
(!ByteSwapMem EOR ReverseEndian). */ (BigEndianMem EOR ReverseEndian). */
#define BigEndianCPU (!ByteSwapMem ^ ReverseEndian) /* Already bits */ #define BigEndianCPU (BigEndianMem ^ ReverseEndian) /* Already bits */
#if !defined(FASTSIM) || defined(PROFILE) #if !defined(FASTSIM) || defined(PROFILE)
/* At the moment these values will be the same, since we do not have /* 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 /* We need to perform the following magic to ensure that that
bytes are written into same byte positions in the target memory bytes are written into same byte positions in the target memory
world, regardless of the endianness of the host. */ world, regardless of the endianness of the host. */
if (!ByteSwapMem) { if (BigEndianMem) {
value = ((uword64)(*buffer++) << 8); value = ((uword64)(*buffer++) << 8);
value |= ((uword64)(*buffer++) << 0); value |= ((uword64)(*buffer++) << 0);
} else { } else {
@ -1075,7 +1081,7 @@ sim_write (addr,buffer,size)
int cca; int cca;
if (AddressTranslation(vaddr,isDATA,isSTORE,&paddr,&cca,isTARGET,isRAW)) { if (AddressTranslation(vaddr,isDATA,isSTORE,&paddr,&cca,isTARGET,isRAW)) {
uword64 value; uword64 value;
if (!ByteSwapMem) { if (BigEndianMem) {
value = ((uword64)(*buffer++) << 24); value = ((uword64)(*buffer++) << 24);
value |= ((uword64)(*buffer++) << 16); value |= ((uword64)(*buffer++) << 16);
value |= ((uword64)(*buffer++) << 8); value |= ((uword64)(*buffer++) << 8);
@ -1096,7 +1102,7 @@ sim_write (addr,buffer,size)
int cca; int cca;
if (AddressTranslation(vaddr,isDATA,isSTORE,&paddr,&cca,isTARGET,isRAW)) { if (AddressTranslation(vaddr,isDATA,isSTORE,&paddr,&cca,isTARGET,isRAW)) {
uword64 value; uword64 value;
if (!ByteSwapMem) { if (BigEndianMem) {
value = ((uword64)(*buffer++) << 56); value = ((uword64)(*buffer++) << 56);
value |= ((uword64)(*buffer++) << 48); value |= ((uword64)(*buffer++) << 48);
value |= ((uword64)(*buffer++) << 40); value |= ((uword64)(*buffer++) << 40);
@ -2303,7 +2309,7 @@ LoadMemory(CCA,AccessLength,pAddr,vAddr,IorD,raw)
extracts the required bytes. However, to keep performance extracts the required bytes. However, to keep performance
high we only load the required bytes into the relevant high we only load the required bytes into the relevant
slots. */ slots. */
if (!ByteSwapMem) if (BigEndianMem)
switch (AccessLength) { /* big-endian memory */ switch (AccessLength) { /* big-endian memory */
case AccessLength_DOUBLEWORD : case AccessLength_DOUBLEWORD :
value |= ((uword64)mem[index++] << 56); value |= ((uword64)mem[index++] << 56);
@ -2355,7 +2361,7 @@ LoadMemory(CCA,AccessLength,pAddr,vAddr,IorD,raw)
StoreMemory routines to avoid shifting the data before StoreMemory routines to avoid shifting the data before
returning or using it. */ returning or using it. */
if (!raw) { /* do nothing for raw accessess */ if (!raw) { /* do nothing for raw accessess */
if (!ByteSwapMem) if (BigEndianMem)
value <<= (((7 - (pAddr & LOADDRMASK)) - AccessLength) * 8); value <<= (((7 - (pAddr & LOADDRMASK)) - AccessLength) * 8);
else /* little-endian only needs to be shifted up to the correct byte offset */ else /* little-endian only needs to be shifted up to the correct byte offset */
value <<= ((pAddr & LOADDRMASK) * 8); 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)); printf("DBG: StoreMemory: offset = %d MemElem = 0x%08X%08X\n",(unsigned int)(pAddr & LOADDRMASK),WORD64HI(MemElem),WORD64LO(MemElem));
#endif /* DEBUG */ #endif /* DEBUG */
if (!ByteSwapMem) { if (BigEndianMem) {
if (raw) if (raw)
shift = ((7 - AccessLength) * 8); shift = ((7 - AccessLength) * 8);
else /* real memory access */ 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)); printf("DBG: StoreMemory: shift = %d MemElem = 0x%08X%08X\n",shift,WORD64HI(MemElem),WORD64LO(MemElem));
#endif /* DEBUG */ #endif /* DEBUG */
if (!ByteSwapMem) { if (BigEndianMem) {
switch (AccessLength) { /* big-endian memory */ switch (AccessLength) { /* big-endian memory */
case AccessLength_DOUBLEWORD : case AccessLength_DOUBLEWORD :
mem[index++] = (unsigned char)(MemElem >> 56); mem[index++] = (unsigned char)(MemElem >> 56);