/* -----------------------------------------------------------------------------
- * $Id: StgCRun.c,v 1.24 2001/07/24 06:02:21 ken Exp $
+ * $Id: StgCRun.c,v 1.25 2001/08/07 20:06:41 ken Exp $
*
* (c) The GHC Team, 1998-2000
*
*
* -------------------------------------------------------------------------- */
+
+/*
+ * We define the following (unused) global register variables, because for
+ * some reason gcc generates sub-optimal code for StgRun() on the Alpha
+ * (unnecessarily saving extra registers on the stack) if we don't.
+ *
+ * Why do it at the top of this file, rather than near StgRun() below? Because
+ * gcc doesn't let us define global register variables after any function
+ * definition has been read. Any point after #include "Stg.h" would be too
+ * late.
+ *
+ * You can define alpha_EXTRA_CAREFUL here to save $s6, $f8 and $f9 -- registers
+ * that we don't use but which are callee-save registers. It shouldn't be
+ * necessary.
+ */
+#include "config.h"
+#ifdef alpha_TARGET_ARCH
+#undef alpha_EXTRA_CAREFUL
+register long fake_ra __asm__("$26");
+#ifdef alpha_EXTRA_CAREFUL
+register long fake_s6 __asm__("$15");
+register double fake_f8 __asm__("$f8");
+register double fake_f9 __asm__("$f9");
+#endif
+#endif
+
/* include Stg.h first because we want real machine regs in here: we
* have to get the value of R1 back from Stg land to C land intact.
*/
/* -----------------------------------------------------------------------------
alpha architecture
+
+ "The stack pointer (SP) must at all times denote an address that has octaword
+ alignment. (This restriction has the side effect that the in-memory portion
+ of the argument list, if any, will start on an octaword boundary.) Note that
+ the stack grows toward lower addresses. During a procedure invocation, SP
+ can never be set to a value that is higher than the value of SP at entry to
+ that procedure invocation.
+
+ "The contents of the stack, located above the portion of the argument list
+ (if any) that is passed in memory, belong to the calling procedure. Because
+ they are part of the calling procedure, they should not be read or written
+ by the called procedure, except as specified by indirect arguments or
+ language-controlled up-level references.
+
+ "The SP value might be used by the hardware when raising exceptions and
+ asynchronous interrupts. It must be assumed that the contents of the stack
+ below the current SP value and within the stack for the current thread are
+ continually and unpredictably modified, as specified in the _Alpha
+ Architecture Reference Manual_, and as a result of asynchronous software
+ actions."
+
+ -- Compaq Computer Corporation, Houston. Tru64 UNIX Calling Standard for
+ Alpha Systems, 5.1 edition, August 2000, section 3.2.1. http://www.
+ tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_PDF/ARH9MBTE.PDF
-------------------------------------------------------------------------- */
#ifdef alpha_TARGET_ARCH
StgThreadReturnCode
StgRun(StgFunPtr f, StgRegTable *basereg)
{
+ register long real_ra __asm__("$26"); volatile long save_ra;
+
+ register long real_s0 __asm__("$9" ); volatile long save_s0;
+ register long real_s1 __asm__("$10"); volatile long save_s1;
+ register long real_s2 __asm__("$11"); volatile long save_s2;
+ register long real_s3 __asm__("$12"); volatile long save_s3;
+ register long real_s4 __asm__("$13"); volatile long save_s4;
+ register long real_s5 __asm__("$14"); volatile long save_s5;
+#ifdef alpha_EXTRA_CAREFUL
+ register long real_s6 __asm__("$15"); volatile long save_s6;
+#endif
+
+ register double real_f2 __asm__("$f2"); volatile double save_f2;
+ register double real_f3 __asm__("$f3"); volatile double save_f3;
+ register double real_f4 __asm__("$f4"); volatile double save_f4;
+ register double real_f5 __asm__("$f5"); volatile double save_f5;
+ register double real_f6 __asm__("$f6"); volatile double save_f6;
+ register double real_f7 __asm__("$f7"); volatile double save_f7;
+#ifdef alpha_EXTRA_CAREFUL
+ register double real_f8 __asm__("$f8"); volatile double save_f8;
+ register double real_f9 __asm__("$f9"); volatile double save_f9;
+#endif
+
+ register StgFunPtr real_pv __asm__("$27");
+
StgThreadReturnCode ret;
- __asm__ volatile ("stq $9,-8($30)\n\t"
- "stq $10,-16($30)\n\t"
- "stq $11,-24($30)\n\t"
- "stq $12,-32($30)\n\t"
- "stq $13,-40($30)\n\t"
- "stq $14,-48($30)\n\t"
- "stq $15,-56($30)\n\t"
- "stt $f2,-64($30)\n\t"
- "stt $f3,-72($30)\n\t"
- "stt $f4,-80($30)\n\t"
- "stt $f5,-88($30)\n\t"
- "stt $f6,-96($30)\n\t"
- "stt $f7,-104($30)\n\t"
- "stt $f8,-112($30)\n\t"
- "stt $f9,-120($30)\n\t"
- "lda $30,-%0($30)" : :
- "K" (RESERVED_C_STACK_BYTES+
- 8*sizeof(double)+8*sizeof(long)));
+ save_ra = real_ra;
- f();
+ save_s0 = real_s0;
+ save_s1 = real_s1;
+ save_s2 = real_s2;
+ save_s3 = real_s3;
+ save_s4 = real_s4;
+ save_s5 = real_s5;
+#ifdef alpha_EXTRA_CAREFUL
+ save_s6 = real_s6;
+#endif
+
+ save_f2 = real_f2;
+ save_f3 = real_f3;
+ save_f4 = real_f4;
+ save_f5 = real_f5;
+ save_f6 = real_f6;
+ save_f7 = real_f7;
+#ifdef alpha_EXTRA_CAREFUL
+ save_f8 = real_f8;
+ save_f9 = real_f9;
+#endif
+
+ real_pv = f;
+
+ __asm__ volatile( "lda $30,-%0($30)" "\n"
+ "\t" "jmp ($27)" "\n"
+ "\t" ".align 3" "\n"
+ ".globl " STG_RETURN "\n"
+ STG_RETURN ":" "\n"
+ "\t" "lda $30,%0($30)" "\n"
+ : : "K" (RESERVED_C_STACK_BYTES));
+
+ ret = real_s5;
+
+ real_s0 = save_s0;
+ real_s1 = save_s1;
+ real_s2 = save_s2;
+ real_s3 = save_s3;
+ real_s4 = save_s4;
+ real_s5 = save_s5;
+#ifdef alpha_EXTRA_CAREFUL
+ real_s6 = save_s6;
+#endif
+
+ real_f2 = save_f2;
+ real_f3 = save_f3;
+ real_f4 = save_f4;
+ real_f5 = save_f5;
+ real_f6 = save_f6;
+ real_f7 = save_f7;
+#ifdef alpha_EXTRA_CAREFUL
+ real_f8 = save_f8;
+ real_f9 = save_f9;
+#endif
- __asm__ volatile (".align 3\n"
- ".globl " STG_RETURN "\n"
- STG_RETURN ":\n\t"
- "lda %0,($14)\n\t" /* save R1 */
- "lda $30,%1($30)\n\t"
- "ldq $9,-8($30)\n\t"
- "ldq $10,-16($30)\n\t"
- "ldq $11,-24($30)\n\t"
- "ldq $12,-32($30)\n\t"
- "ldq $13,-40($30)\n\t"
- "ldq $14,-48($30)\n\t"
- "ldq $15,-56($30)\n\t"
- "ldt $f2,-64($30)\n\t"
- "ldt $f3,-72($30)\n\t"
- "ldt $f4,-80($30)\n\t"
- "ldt $f5,-88($30)\n\t"
- "ldt $f6,-96($30)\n\t"
- "ldt $f7,-104($30)\n\t"
- "ldt $f8,-112($30)\n\t"
- "ldt $f9,-120($30)"
- : "=r" (ret)
- : "K" (RESERVED_C_STACK_BYTES+
- 8*sizeof(double)+8*sizeof(long)));
+ real_ra = save_ra;
return ret;
}
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