* in libc.a clobbers $s6.
*/
#include "ghcconfig.h"
-#ifdef alpha_TARGET_ARCH
+#ifdef alpha_HOST_ARCH
#define alpha_EXTRA_CAREFUL
register long fake_ra __asm__("$26");
register long fake_gp __asm__("$29");
any architecture (using miniinterpreter)
-------------------------------------------------------------------------- */
-StgThreadReturnCode StgRun(StgFunPtr f, StgRegTable *basereg STG_UNUSED)
+StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg STG_UNUSED)
{
while (f) {
- if (RtsFlags[0].DebugFlags.interpreter) {
+ IF_DEBUG(interpreter,
debugBelch("Jumping to ");
printPtr((P_)f); fflush(stdout);
debugBelch("\n");
- }
+ );
f = (StgFunPtr) (f)();
}
- return (StgThreadReturnCode)R1.i;
+ return (StgRegTable *)R1.p;
}
StgFunPtr StgReturn(void)
x86 architecture
-------------------------------------------------------------------------- */
-#ifdef i386_TARGET_ARCH
+#ifdef i386_HOST_ARCH
-StgThreadReturnCode
+#ifdef darwin_TARGET_OS
+#define STG_GLOBAL ".globl "
+#else
+#define STG_GLOBAL ".global "
+#endif
+
+StgRegTable *
StgRun(StgFunPtr f, StgRegTable *basereg) {
unsigned char space[ RESERVED_C_STACK_BYTES + 4*sizeof(void *) ];
- StgThreadReturnCode r;
+ StgRegTable * r;
__asm__ volatile (
/*
*/
"movl %3,%%ebx\n\t"
/*
- * grab the function argument from the stack, and jump to it.
+ * grab the function argument from the stack
*/
"movl %2,%%eax\n\t"
+
+#if darwin_TARGET_OS
+ /*
+ * Darwin: keep the stack aligned
+ */
+ "subl $12,%%esp\n\t"
+#endif
+
+ /*
+ * jump to it
+ */
"jmp *%%eax\n\t"
- ".global " STG_RETURN "\n"
+ STG_GLOBAL STG_RETURN "\n"
STG_RETURN ":\n\t"
+#if darwin_TARGET_OS
+ /*
+ * Darwin: keep the stack aligned
+ */
+ "addl $12,%%esp\n\t"
+#endif
+
"movl %%esi, %%eax\n\t" /* Return value in R1 */
/*
------------------------------------------------------------------------- */
-#ifdef x86_64_TARGET_ARCH
+#ifdef x86_64_HOST_ARCH
-extern StgThreadReturnCode StgRun(StgFunPtr f, StgRegTable *basereg);
+extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
-static void StgRunIsImplementedInAssembler(void)
+void StgRunIsImplementedInAssembler(void);
+void StgRunIsImplementedInAssembler(void)
{
__asm__ volatile (
/*
"addq %0, %%rsp\n\t"
"retq"
- : : "i"(RESERVED_C_STACK_BYTES+48 /*stack frame size*/));
+ : : "i"(RESERVED_C_STACK_BYTES+48+8 /*stack frame size*/));
+ /*
+ HACK alert!
+
+ The x86_64 ABI specifies that on a procedure call, %rsp is
+ aligned on a 16-byte boundary + 8. That is, the first
+ argument on the stack after the return address will be
+ 16-byte aligned.
+
+ Which should be fine: RESERVED_C_STACK_BYTES+48 is a multiple
+ of 16 bytes.
+
+ BUT... when we do a C-call from STG land, gcc likes to put the
+ stack alignment adjustment in the prolog. eg. if we're calling
+ a function with arguments in regs, gcc will insert 'subq $8,%rsp'
+ in the prolog, to keep %rsp aligned (the return address is 8
+ bytes, remember). The mangler throws away the prolog, so we
+ lose the stack alignment.
+
+ The hack is to add this extra 8 bytes to our %rsp adjustment
+ here, so that throughout STG code, %rsp is 16-byte aligned,
+ ready for a C-call.
+
+ A quick way to see if this is wrong is to compile this code:
+
+ main = System.Exit.exitWith ExitSuccess
+
+ And run it with +RTS -sstderr. The stats code in the RTS, in
+ particular statsPrintf(), relies on the stack alignment because
+ it saves the %xmm regs on the stack, so it'll fall over if the
+ stack isn't aligned, and calling exitWith from Haskell invokes
+ shutdownHaskellAndExit using a C call.
+
+ Future gcc releases will almost certainly break this hack...
+ */
}
#endif /* x86-64 */
Updated info (GHC 4.08.2): not saving %i7 any more (see below).
-------------------------------------------------------------------------- */
-#ifdef sparc_TARGET_ARCH
+#ifdef sparc_HOST_ARCH
-StgThreadReturnCode
+StgRegTable *
StgRun(StgFunPtr f, StgRegTable *basereg) {
unsigned char space[RESERVED_C_STACK_BYTES];
__asm__ volatile ("ld %1,%0"
: "=r" (i7) : "m" (((void **)(space))[100]));
#endif
- return (StgThreadReturnCode)R1.i;
+ return (StgRegTable *)R1.i;
}
#endif
tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_PDF/ARH9MBTE.PDF
-------------------------------------------------------------------------- */
-#ifdef alpha_TARGET_ARCH
+#ifdef alpha_HOST_ARCH
-StgThreadReturnCode
+StgRegTable *
StgRun(StgFunPtr f, StgRegTable *basereg)
{
register long real_ra __asm__("$26"); volatile long save_ra;
register StgFunPtr real_pv __asm__("$27");
- StgThreadReturnCode ret;
+ StgRegTable * ret;
save_ra = real_ra;
save_gp = real_gp;
return ret;
}
-#endif /* alpha_TARGET_ARCH */
+#endif /* alpha_HOST_ARCH */
/* -----------------------------------------------------------------------------
HP-PA architecture
-------------------------------------------------------------------------- */
-#ifdef hppa1_1_TARGET_ARCH
+#ifdef hppa1_1_HOST_ARCH
-StgThreadReturnCode
+StgRegTable *
StgRun(StgFunPtr f, StgRegTable *basereg)
{
StgChar space[RESERVED_C_STACK_BYTES+16*sizeof(long)+10*sizeof(double)];
- StgThreadReturnCode ret;
+ StgRegTable * ret;
__asm__ volatile ("ldo %0(%%r30),%%r19\n"
"\tstw %%r3, 0(0,%%r19)\n"
return ret;
}
-#endif /* hppa1_1_TARGET_ARCH */
+#endif /* hppa1_1_HOST_ARCH */
/* -----------------------------------------------------------------------------
PowerPC architecture
-------------------------------------------------------------------------- */
-#ifdef powerpc_TARGET_ARCH
+#ifdef powerpc_HOST_ARCH
-extern StgThreadReturnCode StgRun(StgFunPtr f, StgRegTable *basereg);
+extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
-#ifdef darwin_TARGET_OS
-static void StgRunIsImplementedInAssembler(void)
+#ifdef darwin_HOST_OS
+void StgRunIsImplementedInAssembler(void)
{
+#if HAVE_SUBSECTIONS_VIA_SYMBOLS
+ // if the toolchain supports deadstripping, we have to
+ // prevent it here (it tends to get confused here).
+ __asm__ volatile (".no_dead_strip _StgRunIsImplementedInAssembler");
+#endif
__asm__ volatile (
"\n.globl _StgRun\n"
"_StgRun:\n"
-------------------------------------------------------------------------- */
-#ifdef powerpc64_TARGET_ARCH
+#ifdef powerpc64_HOST_ARCH
-#ifdef linux_TARGET_OS
-extern StgThreadReturnCode StgRun(StgFunPtr f, StgRegTable *basereg);
+#ifdef linux_HOST_OS
+extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
static void StgRunIsImplementedInAssembler(void)
{
"\tblr\n"
: : "i"(RESERVED_C_STACK_BYTES+304 /*stack frame size*/));
}
-#else // linux_TARGET_OS
+#else // linux_HOST_OS
#error Only linux support for power64 right now.
#endif
loc31: saved gp (gcc 3.3 uses this slot)
-------------------------------------------------------------------------- */
-#ifdef ia64_TARGET_ARCH
+#ifdef ia64_HOST_ARCH
/* the memory stack is rarely used, so 16K is excessive */
#undef RESERVED_C_STACK_BYTES