#include "RtsFlags.h"
/* Heavily arch-specific, I'm afraid.. */
-#if defined(i386_TARGET_ARCH) || defined(sparc_TARGET_ARCH)
+#if defined(i386_TARGET_ARCH) || defined(sparc_TARGET_ARCH) || defined(alpha_TARGET_ARCH)
+#if defined(i386_TARGET_ARCH)
/* Now here's something obscure for you:
When generating an adjustor thunk that uses the C calling
{ 0x83, 0xc4, 0x04 /* addl $0x4, %esp */
, 0xc3 /* ret */
};
-
+#endif
void*
createAdjustor(int cconv, StgStablePtr hptr, StgFunPtr wptr)
{
- void *adjustor;
- unsigned char* adj_code;
- size_t sizeof_adjustor;
-
- if (cconv == 0) { /* the adjustor will be _stdcall'ed */
-
-#if defined(sparc_TARGET_ARCH)
- /* SPARC doesn't have a calling convention other than _ccall */
- if (cconv == 0) {
- return NULL;
- }
-#endif
+ void *adjustor = NULL;
+ switch (cconv)
+ {
+ case 0: /* _stdcall */
+#if defined(i386_TARGET_ARCH)
/* Magic constant computed by inspecting the code length of
the following assembly language snippet
(offset and machine code prefixed):
<c>: ff e0 jmp %eax # and jump to it.
# the callee cleans up the stack
*/
- sizeof_adjustor = 14*sizeof(char);
-
- if ((adjustor = stgMallocBytes(sizeof_adjustor,"createAdjustor")) == NULL) {
- return NULL;
- }
-
- adj_code = (unsigned char*)adjustor;
- adj_code[0x00] = (unsigned char)0x58; /* popl %eax */
-
- adj_code[0x01] = (unsigned char)0x68; /* pushl hptr (which is a dword immediate ) */
- *((StgStablePtr*)(adj_code + 0x02)) = (StgStablePtr)hptr;
+ if ((adjustor = stgMallocBytes(14, "createAdjustor")) != NULL) {
+ unsigned char *const adj_code = (unsigned char *)adjustor;
+ adj_code[0x00] = (unsigned char)0x58; /* popl %eax */
- adj_code[0x06] = (unsigned char)0x50; /* pushl %eax */
+ adj_code[0x01] = (unsigned char)0x68; /* pushl hptr (which is a dword immediate ) */
+ *((StgStablePtr*)(adj_code + 0x02)) = (StgStablePtr)hptr;
- adj_code[0x07] = (unsigned char)0xb8; /* movl $wptr, %eax */
- *((StgFunPtr*)(adj_code + 0x08)) = (StgFunPtr)wptr;
+ adj_code[0x06] = (unsigned char)0x50; /* pushl %eax */
- adj_code[0x0c] = (unsigned char)0xff; /* jmp %eax */
- adj_code[0x0d] = (unsigned char)0xe0;
+ adj_code[0x07] = (unsigned char)0xb8; /* movl $wptr, %eax */
+ *((StgFunPtr*)(adj_code + 0x08)) = (StgFunPtr)wptr;
+ adj_code[0x0c] = (unsigned char)0xff; /* jmp %eax */
+ adj_code[0x0d] = (unsigned char)0xe0;
+ }
+#endif
+ break;
- } else { /* the adjustor will be _ccall'ed */
-
+ case 1: /* _ccall */
#if defined(i386_TARGET_ARCH)
/* Magic constant computed by inspecting the code length of
the following assembly language snippet
coming back from the C stub is not stored on the stack.
That's (thankfully) the case here with the restricted set of
return types that we support.
-
-
*/
- sizeof_adjustor = 17*sizeof(char);
+ if ((adjustor = stgMallocBytes(17, "createAdjustor")) != NULL) {
+ unsigned char *const adj_code = (unsigned char *)adjustor;
- if ((adjustor = stgMallocBytes(sizeof_adjustor,"createAdjustor")) == NULL) {
- return NULL;
- }
+ adj_code[0x00] = (unsigned char)0x68; /* pushl hptr (which is a dword immediate ) */
+ *((StgStablePtr*)(adj_code+0x01)) = (StgStablePtr)hptr;
- adj_code = (unsigned char*)adjustor;
+ adj_code[0x05] = (unsigned char)0xb8; /* movl $wptr, %eax */
+ *((StgFunPtr*)(adj_code + 0x06)) = (StgFunPtr)wptr;
- adj_code[0x00] = (unsigned char)0x68; /* pushl hptr (which is a dword immediate ) */
- *((StgStablePtr*)(adj_code+0x01)) = (StgStablePtr)hptr;
-
- adj_code[0x05] = (unsigned char)0xb8; /* movl $wptr, %eax */
- *((StgFunPtr*)(adj_code + 0x06)) = (StgFunPtr)wptr;
-
- adj_code[0x0a] = (unsigned char)0x68; /* pushl __obscure_ccall_ret_code */
- *((StgFunPtr*)(adj_code + 0x0b)) = (StgFunPtr)__obscure_ccall_ret_code;
-
- adj_code[0x0f] = (unsigned char)0xff; /* jmp *%eax */
- adj_code[0x10] = (unsigned char)0xe0;
+ adj_code[0x0a] = (unsigned char)0x68; /* pushl __obscure_ccall_ret_code */
+ *((StgFunPtr*)(adj_code + 0x0b)) = (StgFunPtr)__obscure_ccall_ret_code;
+ adj_code[0x0f] = (unsigned char)0xff; /* jmp *%eax */
+ adj_code[0x10] = (unsigned char)0xe0;
+ }
#elif defined(sparc_TARGET_ARCH)
/* Magic constant computed by inspecting the code length of
the following assembly language snippet
code above contains the input paramter to wptr.) The return address
is stored in %o7/%i7. Since we don't shift the window in this code,
the return address is preserved and wptr will return to our caller.
-
*/
- sizeof_adjustor = 28*sizeof(char);
+ if ((adjustor = stgMallocBytes(28, "createAdjustor")) != NULL) {
+ unsigned char *const adj_code = (unsigned char *)adjustor;
+
+ /* sethi %hi(wptr), %o1 */
+ *((unsigned long*)(adj_code+0x00)) = (unsigned long)0x13000000;
+ *((unsigned long*)(adj_code+0x00)) |= ((unsigned long)wptr) >> 10;
- if ((adjustor = stgMallocBytes(sizeof_adjustor,"createAdjustor")) == NULL) {
- return NULL;
+ /* sethi %hi(hptr), %o0 */
+ *((unsigned long*)(adj_code+0x04)) = (unsigned long)0x11000000;
+ *((unsigned long*)(adj_code+0x04)) |= ((unsigned long)hptr) >> 10;
+
+ /* jmp %o1+%lo(wptr) */
+ *((unsigned long*)(adj_code+0x08)) = (unsigned long)0x81c26000;
+ *((unsigned long*)(adj_code+0x08)) |= ((unsigned long)wptr) & 0x000003ff;
+
+ /* or %o0, %lo(hptr), %o0 */
+ *((unsigned long*)(adj_code+0x0c)) = (unsigned long)0x90122000;
+ *((unsigned long*)(adj_code+0x0c)) |= ((unsigned long)hptr) & 0x000003ff;
+
+ *((StgStablePtr*)(adj_code+0x10)) = (StgStablePtr)hptr;
}
+#elif defined(alpha_TARGET_ARCH)
+ /* Magic constant computed by inspecting the code length of
+ the following assembly language snippet
+ (offset and machine code prefixed; note that the machine code
+ shown is longwords stored in little-endian order):
+
+ <00>: a61b0010 ldq a0, 0x10(pv) # load up hptr
+ <04>: a77b0018 ldq pv, 0x18(pv) # load up wptr
+ <08>: 6bfbabcd jmp (pv), 0xabcd # jump to wptr (with hint)
+ <0c>: 47ff041f nop # padding for alignment
+ <10>: [8 bytes for hptr quadword]
+ <18>: [8 bytes for wptr quadword]
+
+ The "computed" jump at <08> above is really a jump to a fixed
+ location. Accordingly, we place an always-correct hint in the
+ jump instruction, namely the address offset from <0c> to wptr,
+ divided by 4, taking the lowest 14 bits.
+
+TODO: Depending on how much allocation overhead stgMallocBytes uses for
+ header information (more precisely, if the overhead is no more than
+ 4 bytes), we should move the first three instructions above down by
+ 4 bytes (getting rid of the nop), hence saving memory. [ccshan]
+ */
+ ASSERT(((StgWord64)wptr & 3) == 0);
+ if ((adjustor = stgMallocBytes(32, "createAdjustor")) != NULL) {
+ StgWord64 *const code = (StgWord64 *)adjustor;
- adj_code = (unsigned char*)adjustor;
-
- /* sethi %hi(wptr), %o1 */
- *((unsigned long*)(adj_code+0x00)) = (unsigned long)0x13000000;
- *((unsigned long*)(adj_code+0x00)) |= ((unsigned long)wptr) >> 10;
-
- /* sethi %hi(hptr), %o0 */
- *((unsigned long*)(adj_code+0x04)) = (unsigned long)0x11000000;
- *((unsigned long*)(adj_code+0x04)) |= ((unsigned long)hptr) >> 10;
-
- /* jmp %o1+%lo(wptr) */
- *((unsigned long*)(adj_code+0x08)) = (unsigned long)0x81c26000;
- *((unsigned long*)(adj_code+0x08)) |= ((unsigned long)wptr) & 0x000003ff;
-
- /* or %o0, %lo(hptr), %o0 */
- *((unsigned long*)(adj_code+0x0c)) = (unsigned long)0x90122000;
- *((unsigned long*)(adj_code+0x0c)) |= ((unsigned long)hptr) & 0x000003ff;
-
- *((StgStablePtr*)(adj_code+0x10)) = (StgStablePtr)hptr;
+ code[0] = 0xa77b0018a61b0010L;
+ code[1] = 0x47ff041f6bfb0000L
+ | (((StgWord32*)(wptr) - (StgWord32*)(code) - 3) & 0x3fff);
+
+ code[2] = (StgWord64)hptr;
+ code[3] = (StgWord64)wptr;
+ }
+#else
+#error Adjustor creation is not supported on this platform.
#endif
+ break;
+ default:
+ ASSERT(0);
+ break;
}
/* Have fun! */
- return ((void*)adjustor);
+ return adjustor;
}
+#endif
+
void
freeHaskellFunctionPtr(void* ptr)
{
/* Free the stable pointer first..*/
freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 0x10)));
+#elif defined(sparc_TARGET_ARCH)
+ if ( *(StgWord64*)ptr != 0xa77b0018a61b0010L ) {
+ fprintf(stderr, "freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+ return;
+ }
+
+ /* Free the stable pointer first..*/
+ freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 0x10)));
+#else
+ ASSERT(0);
#endif
*((unsigned char*)ptr) = '\0';
free(ptr);
}
-#else /* Provide dummy */
-void
-freeHaskellFunctionPtr(void* ptr)
-{
-}
-
-#endif /* i386_TARGET_ARCH || sparc_TARGET_ARCH */
-
projects / ghc-hetmet.git / commitdiff