typedef unsigned long my_uintptr_t;
#endif
+#if defined(powerpc_TARGET_ARCH) && defined(linux_TARGET_OS)
+#include <string.h>
+#endif
+
/* Heavily arch-specific, I'm afraid.. */
/*
}
#endif
+#if defined(powerpc_TARGET_ARCH) && defined(linux_TARGET_OS)
+__asm__("obscure_ccall_ret_code:\n\t"
+ "lwz 1,0(1)\n\t"
+ "lwz 0,4(1)\n\t"
+ "mtlr 0\n\t"
+ "blr");
+extern void obscure_ccall_ret_code(void);
+#endif
+
#if defined(powerpc_TARGET_ARCH) || defined(powerpc64_TARGET_ARCH)
#if !(defined(powerpc_TARGET_ARCH) && defined(linux_TARGET_OS))
__asm__ volatile("call_pal %0" : : "i" (PAL_imb));
}
#elif defined(powerpc_TARGET_ARCH) && defined(linux_TARGET_OS)
-/*
- For PowerPC Linux, the following code is used:
-
- mr r10,r8
- mr r9,r7
- mr r8,r6
- mr r7,r5
- mr r6,r4
- mr r5,r3
- lis r0,0xDEAD ;hi(wptr)
- lis r3,0xDEAF ;hi(hptr)
- ori r0,r0,0xBEEF ; lo(wptr)
- ori r3,r3,0xFACE ; lo(hptr)
- mtctr r0
- bctr
-
- The arguments (passed in registers r3 - r10) are shuffled along by two to
- make room for hptr and a dummy argument. As r9 and r10 are overwritten by
- this code, it only works for up to 6 arguments (when floating point arguments
- are involved, this may be more or less, depending on the exact situation).
-*/
- adjustor = mallocBytesRWX(4*13);
- {
- unsigned long *const adj_code = (unsigned long *)adjustor;
-
- // make room for extra arguments
- adj_code[0] = 0x7d0a4378; //mr r10,r8
- adj_code[1] = 0x7ce93b78; //mr r9,r7
- adj_code[2] = 0x7cc83378; //mr r8,r6
- adj_code[3] = 0x7ca72b78; //mr r7,r5
- adj_code[4] = 0x7c862378; //mr r6,r4
- adj_code[5] = 0x7c651b78; //mr r5,r3
-
- adj_code[6] = 0x3c000000; //lis r0,hi(wptr)
- adj_code[6] |= ((unsigned long)wptr) >> 16;
-
- adj_code[7] = 0x3c600000; //lis r3,hi(hptr)
- adj_code[7] |= ((unsigned long)hptr) >> 16;
-
- adj_code[8] = 0x60000000; //ori r0,r0,lo(wptr)
- adj_code[8] |= ((unsigned long)wptr) & 0xFFFF;
-
- adj_code[9] = 0x60630000; //ori r3,r3,lo(hptr)
- adj_code[9] |= ((unsigned long)hptr) & 0xFFFF;
-
- adj_code[10] = 0x7c0903a6; //mtctr r0
- adj_code[11] = 0x4e800420; //bctr
- adj_code[12] = (unsigned long)hptr;
-
- // Flush the Instruction cache:
- // MakeDataExecutable(adjustor,4*13);
- /* This would require us to link with CoreServices.framework */
- { /* this should do the same: */
- int n = 13;
- unsigned long *p = adj_code;
- while(n--)
- {
- __asm__ volatile ("dcbf 0,%0\n\tsync\n\ticbi 0,%0"
- : : "r" (p));
- p++;
- }
- __asm__ volatile ("sync\n\tisync");
- }
- }
+
+#define OP_LO(op,lo) ((((unsigned)(op)) << 16) | (((unsigned)(lo)) & 0xFFFF))
+#define OP_HI(op,hi) ((((unsigned)(op)) << 16) | (((unsigned)(hi)) >> 16))
+ {
+ /* The PowerPC Linux (32-bit) calling convention is annoyingly complex.
+ We need to calculate all the details of the stack frame layout,
+ taking into account the types of all the arguments, and then
+ generate code on the fly. */
+
+ int src_gpr = 3, dst_gpr = 5;
+ int fpr = 3;
+ int src_offset = 0, dst_offset = 0;
+ int n = strlen(typeString),i;
+ int src_locs[n], dst_locs[n];
+ int frameSize;
+ unsigned *code;
+
+ /* Step 1:
+ Calculate where the arguments should go.
+ src_locs[] will contain the locations of the arguments in the
+ original stack frame passed to the adjustor.
+ dst_locs[] will contain the locations of the arguments after the
+ adjustor runs, on entry to the wrapper proc pointed to by wptr.
+
+ This algorithm is based on the one described on page 3-19 of the
+ System V ABI PowerPC Processor Supplement.
+ */
+ for(i=0;typeString[i];i++)
+ {
+ char t = typeString[i];
+ if((t == 'f' || t == 'd') && fpr <= 8)
+ src_locs[i] = dst_locs[i] = -32-(fpr++);
+ else
+ {
+ if(t == 'l' && src_gpr <= 9)
+ {
+ if((src_gpr & 1) == 0)
+ src_gpr++;
+ src_locs[i] = -src_gpr;
+ src_gpr += 2;
+ }
+ else if(t == 'i' && src_gpr <= 10)
+ {
+ src_locs[i] = -(src_gpr++);
+ }
+ else
+ {
+ if(t == 'l' || t == 'd')
+ {
+ if(src_offset % 8)
+ src_offset += 4;
+ }
+ src_locs[i] = src_offset;
+ src_offset += (t == 'l' || t == 'd') ? 8 : 4;
+ }
+
+ if(t == 'l' && dst_gpr <= 9)
+ {
+ if((dst_gpr & 1) == 0)
+ dst_gpr++;
+ dst_locs[i] = -dst_gpr;
+ dst_gpr += 2;
+ }
+ else if(t == 'i' && dst_gpr <= 10)
+ {
+ dst_locs[i] = -(dst_gpr++);
+ }
+ else
+ {
+ if(t == 'l' || t == 'd')
+ {
+ if(dst_offset % 8)
+ dst_offset += 4;
+ }
+ dst_locs[i] = dst_offset;
+ dst_offset += (t == 'l' || t == 'd') ? 8 : 4;
+ }
+ }
+ }
+
+ frameSize = dst_offset + 8;
+ frameSize = (frameSize+15) & ~0xF;
+
+ /* Step 2:
+ Build the adjustor.
+ */
+ // allocate space for at most 4 insns per parameter
+ // plus 14 more instructions.
+ adjustor = mallocBytesRWX(4 * (4*n + 14));
+ code = (unsigned*)adjustor;
+
+ *code++ = 0x48000008; // b *+8
+ // * Put the hptr in a place where freeHaskellFunctionPtr
+ // can get at it.
+ *code++ = (unsigned) hptr;
+
+ // * save the link register
+ *code++ = 0x7c0802a6; // mflr r0;
+ *code++ = 0x90010004; // stw r0, 4(r1);
+ // * and build a new stack frame
+ *code++ = OP_LO(0x9421, -frameSize); // stwu r1, -frameSize(r1)
+
+ // * now generate instructions to copy arguments
+ // from the old stack frame into the new stack frame.
+ for(i=n-1;i>=0;i--)
+ {
+ if(src_locs[i] < -32)
+ ASSERT(dst_locs[i] == src_locs[i]);
+ else if(src_locs[i] < 0)
+ {
+ // source in GPR.
+ ASSERT(typeString[i] != 'f' && typeString[i] != 'd');
+ if(dst_locs[i] < 0)
+ {
+ ASSERT(dst_locs[i] > -32);
+ // dst is in GPR, too.
+
+ if(typeString[i] == 'l')
+ {
+ // mr dst+1, src+1
+ *code++ = 0x7c000378
+ | ((-dst_locs[i]+1) << 16)
+ | ((-src_locs[i]+1) << 11)
+ | ((-src_locs[i]+1) << 21);
+ }
+ // mr dst, src
+ *code++ = 0x7c000378
+ | ((-dst_locs[i]) << 16)
+ | ((-src_locs[i]) << 11)
+ | ((-src_locs[i]) << 21);
+ }
+ else
+ {
+ if(typeString[i] == 'l')
+ {
+ // stw src+1, dst_offset+4(r1)
+ *code++ = 0x90010000
+ | ((-src_locs[i]+1) << 21)
+ | (dst_locs[i] + 4);
+ }
+
+ // stw src, dst_offset(r1)
+ *code++ = 0x90010000
+ | ((-src_locs[i]) << 21)
+ | (dst_locs[i] + 8);
+ }
+ }
+ else
+ {
+ ASSERT(dst_locs[i] >= 0);
+ ASSERT(typeString[i] != 'f' && typeString[i] != 'd');
+
+ if(typeString[i] == 'l')
+ {
+ // lwz r0, src_offset(r1)
+ *code++ = 0x80010000
+ | (src_locs[i] + frameSize + 8 + 4);
+ // stw r0, dst_offset(r1)
+ *code++ = 0x90010000
+ | (dst_locs[i] + 8 + 4);
+ }
+ // lwz r0, src_offset(r1)
+ *code++ = 0x80010000
+ | (src_locs[i] + frameSize + 8);
+ // stw r0, dst_offset(r1)
+ *code++ = 0x90010000
+ | (dst_locs[i] + 8);
+ }
+ }
+
+ // * hptr will be the new first argument.
+ // lis r3, hi(hptr)
+ *code++ = OP_HI(0x3c60, hptr);
+ // ori r3,r3,lo(hptr)
+ *code++ = OP_LO(0x6063, hptr);
+
+ // * we need to return to a piece of code
+ // which will tear down the stack frame.
+ // lis r11,hi(obscure_ccall_ret_code)
+ *code++ = OP_HI(0x3d60, obscure_ccall_ret_code);
+ // ori r11,r11,lo(obscure_ccall_ret_code)
+ *code++ = OP_LO(0x616b, obscure_ccall_ret_code);
+ // mtlr r11
+ *code++ = 0x7d6803a6;
+
+ // * jump to wptr
+ // lis r11,hi(wptr)
+ *code++ = OP_HI(0x3d60, wptr);
+ // ori r11,r11,lo(wptr)
+ *code++ = OP_LO(0x616b, wptr);
+ // mtctr r11
+ *code++ = 0x7d6903a6;
+ // bctr
+ *code++ = 0x4e800420;
+
+ // Flush the Instruction cache:
+ {
+ unsigned *p = adjustor;
+ while(p < code)
+ {
+ __asm__ volatile ("dcbf 0,%0\n\tsync\n\ticbi 0,%0"
+ : : "r" (p));
+ p++;
+ }
+ __asm__ volatile ("sync\n\tisync");
+ }
+ }
#elif defined(powerpc_TARGET_ARCH) || defined(powerpc64_TARGET_ARCH)
/* Free the stable pointer first..*/
freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 0x10)));
#elif defined(powerpc_TARGET_ARCH) && defined(linux_TARGET_OS)
- if ( *(StgWord*)ptr != 0x7d0a4378 ) {
+ if ( *(StgWord*)ptr != 0x48000008 ) {
errorBelch("freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
return;
}
- freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 4*12)));
+ freeStablePtr(((StgStablePtr*)ptr)[1]);
#elif defined(powerpc_TARGET_ARCH) || defined(powerpc64_TARGET_ARCH)
extern void* adjustorCode;
if ( ((AdjustorStub*)ptr)->code != (StgFunPtr) &adjustorCode ) {
projects / ghc-hetmet.git / commitdiff