*/
#include "PosixSource.h"
#include "Rts.h"
+#include "RtsExternal.h"
#include "RtsUtils.h"
-#include "RtsFlags.h"
-
#include <stdlib.h>
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
/* Heavily arch-specific, I'm afraid.. */
+typedef enum {
+ pageExecuteRead,
+ pageExecuteReadWrite
+} pageMode;
+
+/*
+ * Function: execPage()
+ *
+ * Set the executable bit on page containing addr.
+ *
+ * TODO: Can the code span more than one page? If yes, we need to make two
+ * pages executable!
+ */
+static rtsBool
+execPage (void* addr, pageMode mode)
+{
+#if defined(i386_TARGET_ARCH) && defined(_WIN32) && 0
+ SYSTEM_INFO sInfo;
+ DWORD dwOldProtect = 0;
+
+ /* doesn't return a result, so presumably it can't fail... */
+ GetSystemInfo(&sInfo);
+
+ if ( VirtualProtect ( (void*)((unsigned long)addr & (sInfo.dwPageSize - 1)),
+ sInfo.dwPageSize,
+ ( mode == pageExecuteReadWrite ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ),
+ &dwOldProtect) == 0 ) {
+# if 1
+ DWORD rc = GetLastError();
+ prog_belch("execPage: failed to protect 0x%p; error=%lu; old protection: %lu\n", addr, rc, dwOldProtect);
+# endif
+ return rtsFalse;
+ }
+ return rtsTrue;
+#else
+ (void)addr; (void)mode; /* keep gcc -Wall happy */
+ return rtsTrue;
+#endif
+}
+
#if defined(i386_TARGET_ARCH)
-/* Now here's something obscure for you:
-
- When generating an adjustor thunk that uses the C calling
- convention, we have to make sure that the thunk kicks off
- the process of jumping into Haskell with a tail jump. Why?
- Because as a result of jumping in into Haskell we may end
- up freeing the very adjustor thunk we came from using
- freeHaskellFunctionPtr(). Hence, we better not return to
- the adjustor code on our way out, since it could by then
- point to junk.
-
- The fix is readily at hand, just include the opcodes
- for the C stack fixup code that we need to perform when
- returning in some static piece of memory and arrange
- to return to it before tail jumping from the adjustor thunk.
-
- For this to work we make the assumption that bytes in .data
- are considered executable.
-*/
-static unsigned char __obscure_ccall_ret_code [] =
- { 0x83, 0xc4, 0x04 /* addl $0x4, %esp */
- , 0xc3 /* ret */
- };
+static unsigned char *obscure_ccall_ret_code;
#endif
#if defined(alpha_TARGET_ARCH)
/* To get the definition of PAL_imb: */
-#include <machine/pal.h>
+# if defined(linux_TARGET_OS)
+# include <asm/pal.h>
+# else
+# include <machine/pal.h>
+# endif
+#endif
+
+#if defined(ia64_TARGET_ARCH)
+#include "Storage.h"
+
+/* Layout of a function descriptor */
+typedef struct _IA64FunDesc {
+ StgWord64 ip;
+ StgWord64 gp;
+} IA64FunDesc;
+
+static void *
+stgAllocStable(size_t size_in_bytes, StgStablePtr *stable)
+{
+ StgArrWords* arr;
+ nat data_size_in_words, total_size_in_words;
+
+ /* round up to a whole number of words */
+ data_size_in_words = (size_in_bytes + sizeof(W_) + 1) / sizeof(W_);
+ total_size_in_words = sizeofW(StgArrWords) + data_size_in_words;
+
+ /* allocate and fill it in */
+ arr = (StgArrWords *)allocate(total_size_in_words);
+ SET_ARR_HDR(arr, &stg_ARR_WORDS_info, CCCS, data_size_in_words);
+
+ /* obtain a stable ptr */
+ *stable = getStablePtr((StgPtr)arr);
+
+ /* and return a ptr to the goods inside the array */
+ return(BYTE_ARR_CTS(arr));
+}
#endif
void*
adj_code[0x0c] = (unsigned char)0xff; /* jmp %eax */
adj_code[0x0d] = (unsigned char)0xe0;
+
+ execPage(adjustor, pageExecuteReadWrite);
}
#endif
break;
<00>: 68 ef be ad de pushl $0xdeadbeef # constant is large enough to
# hold a StgStablePtr
<05>: b8 fa ef ff 00 movl $0x00ffeffa, %eax # load up wptr
- <0a>: 68 ef be ad de pushl $__obscure_ccall_ret_code # push the return address
+ <0a>: 68 ef be ad de pushl $obscure_ccall_ret_code # push the return address
<0f>: ff e0 jmp *%eax # jump to wptr
The ccall'ing version is a tad different, passing in the return
via the stable pointer.) (The auto-generated C stub is in on this
game, don't worry :-)
- See the comment next to __obscure_ccall_ret_code why we need to
+ See the comment next to obscure_ccall_ret_code why we need to
perform a tail jump instead of a call, followed by some C stack
fixup.
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[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;
+
+ execPage(adjustor, pageExecuteReadWrite);
}
#elif defined(sparc_TARGET_ARCH)
/* Magic constant computed by inspecting the code length of the following
while(n--)
{
__asm__ volatile ("dcbf 0,%0\n\tsync\n\ticbi 0,%0"
- : : "g" (p));
+ : : "r" (p));
p++;
}
__asm__ volatile ("sync\n\tisync");
}
}
+#elif defined(ia64_TARGET_ARCH)
+/*
+ Up to 8 inputs are passed in registers. We flush the last two inputs to
+ the stack, initially into the 16-byte scratch region left by the caller.
+ We then shuffle the others along by 4 (taking 2 registers for ourselves
+ to save return address and previous function state - we need to come back
+ here on the way out to restore the stack, so this is a real function
+ rather than just a trampoline).
+
+ The function descriptor we create contains the gp of the target function
+ so gp is already loaded correctly.
+
+ [MLX] alloc r16=ar.pfs,10,2,0
+ movl r17=wptr
+ [MII] st8.spill [r12]=r38,8 // spill in6 (out4)
+ mov r41=r37 // out7 = in5 (out3)
+ mov r40=r36;; // out6 = in4 (out2)
+ [MII] st8.spill [r12]=r39 // spill in7 (out5)
+ mov.sptk b6=r17,50
+ mov r38=r34;; // out4 = in2 (out0)
+ [MII] mov r39=r35 // out5 = in3 (out1)
+ mov r37=r33 // out3 = in1 (loc1)
+ mov r36=r32 // out2 = in0 (loc0)
+ [MLX] adds r12=-24,r12 // update sp
+ movl r34=hptr;; // out0 = hptr
+ [MIB] mov r33=r16 // loc1 = ar.pfs
+ mov r32=b0 // loc0 = retaddr
+ br.call.sptk.many b0=b6;;
+
+ [MII] adds r12=-16,r12
+ mov b0=r32
+ mov.i ar.pfs=r33
+ [MFB] nop.m 0x0
+ nop.f 0x0
+ br.ret.sptk.many b0;;
+*/
+
+/* These macros distribute a long constant into the two words of an MLX bundle */
+#define BITS(val,start,count) (((val) >> (start)) & ((1 << (count))-1))
+#define MOVL_LOWORD(val) (BITS(val,22,18) << 46)
+#define MOVL_HIWORD(val) (BITS(val,40,23) | (BITS(val,0,7) << 36) | (BITS(val,7,9) << 50) \
+ | (BITS(val,16,5) << 55) | (BITS(val,21,1) << 44) | BITS(val,63,1) << 59)
+
+ {
+ StgStablePtr stable;
+ IA64FunDesc *wdesc = (IA64FunDesc *)wptr;
+ StgWord64 wcode = wdesc->ip;
+ IA64FunDesc *fdesc;
+ StgWord64 *code;
+
+ /* we allocate on the Haskell heap since malloc'd memory isn't executable - argh */
+ adjustor = stgAllocStable(sizeof(IA64FunDesc)+18*8, &stable);
+
+ fdesc = (IA64FunDesc *)adjustor;
+ code = (StgWord64 *)(fdesc + 1);
+ fdesc->ip = (StgWord64)code;
+ fdesc->gp = wdesc->gp;
+
+ code[0] = 0x0000058004288004 | MOVL_LOWORD(wcode);
+ code[1] = 0x6000000220000000 | MOVL_HIWORD(wcode);
+ code[2] = 0x029015d818984001;
+ code[3] = 0x8401200500420094;
+ code[4] = 0x886011d8189c0001;
+ code[5] = 0x84011004c00380c0;
+ code[6] = 0x0250210046013800;
+ code[7] = 0x8401000480420084;
+ code[8] = 0x0000233f19a06005 | MOVL_LOWORD((StgWord64)hptr);
+ code[9] = 0x6000000440000000 | MOVL_HIWORD((StgWord64)hptr);
+ code[10] = 0x0200210020010811;
+ code[11] = 0x1080006800006200;
+ code[12] = 0x0000210018406000;
+ code[13] = 0x00aa021000038005;
+ code[14] = 0x000000010000001d;
+ code[15] = 0x0084000880000200;
+
+ /* save stable pointers in convenient form */
+ code[16] = (StgWord64)hptr;
+ code[17] = (StgWord64)stable;
+ }
#else
barf("adjustor creation not supported on this platform");
#endif
#if defined(i386_TARGET_ARCH)
if ( *(unsigned char*)ptr != 0x68 &&
*(unsigned char*)ptr != 0x58 ) {
- fprintf(stderr, "freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+ prog_belch("freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
return;
}
}
#elif defined(sparc_TARGET_ARCH)
if ( *(unsigned long*)ptr != 0x9C23A008UL ) {
- fprintf(stderr, "freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+ prog_belch("freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
return;
}
freeStablePtr(*((StgStablePtr*)((unsigned long*)ptr + 11)));
#elif defined(alpha_TARGET_ARCH)
if ( *(StgWord64*)ptr != 0xa77b0018a61b0010L ) {
- fprintf(stderr, "freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+ prog_belch("freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
return;
}
freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 0x10)));
#elif defined(powerpc_TARGET_ARCH)
if ( *(StgWord*)ptr != 0x7d0a4378 ) {
- fprintf(stderr, "freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+ prog_belch("freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
return;
}
freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 4*12)));
+#elif defined(ia64_TARGET_ARCH)
+ IA64FunDesc *fdesc = (IA64FunDesc *)ptr;
+ StgWord64 *code = (StgWord64 *)(fdesc+1);
+
+ if (fdesc->ip != (StgWord64)code) {
+ prog_belch("freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+ return;
+ }
+ freeStablePtr((StgStablePtr)code[16]);
+ freeStablePtr((StgStablePtr)code[17]);
+ return;
#else
ASSERT(0);
#endif
*((unsigned char*)ptr) = '\0';
- free(ptr);
+ stgFree(ptr);
}
+
+/*
+ * Function: initAdjustor()
+ *
+ * Perform initialisation of adjustor thunk layer (if needed.)
+ */
+rtsBool
+initAdjustor(void)
+{
+#if defined(i386_TARGET_ARCH)
+ /* Now here's something obscure for you:
+
+ When generating an adjustor thunk that uses the C calling
+ convention, we have to make sure that the thunk kicks off
+ the process of jumping into Haskell with a tail jump. Why?
+ Because as a result of jumping in into Haskell we may end
+ up freeing the very adjustor thunk we came from using
+ freeHaskellFunctionPtr(). Hence, we better not return to
+ the adjustor code on our way out, since it could by then
+ point to junk.
+
+ The fix is readily at hand, just include the opcodes
+ for the C stack fixup code that we need to perform when
+ returning in some static piece of memory and arrange
+ to return to it before tail jumping from the adjustor thunk.
+ */
+
+ obscure_ccall_ret_code = stgMallocBytes(4, "initAdjustor");
+
+ obscure_ccall_ret_code[0x00] = (unsigned char)0x83; /* addl $0x4, %esp */
+ obscure_ccall_ret_code[0x01] = (unsigned char)0xc4;
+ obscure_ccall_ret_code[0x02] = (unsigned char)0x04;
+
+ obscure_ccall_ret_code[0x03] = (unsigned char)0xc3; /* ret */
+
+ execPage(obscure_ccall_ret_code, pageExecuteRead);
+#endif
+ return rtsTrue;
+}
projects / ghc-hetmet.git / blobdiff