Reorganisation of the source tree

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.

1 files changed, 189 insertions, 0 deletions

diff --git a/rts/AdjustorAsm.S b/rts/AdjustorAsm.S
new file mode 100644
index 0000000000..cfdef68349
--- /dev/null
+++ b/rts/AdjustorAsm.S
@@ -0,0 +1,189 @@
+#include "../includes/ghcconfig.h"
+
+/* ******************************** PowerPC ******************************** */
+
+#if defined(powerpc_HOST_ARCH) || defined(powerpc64_HOST_ARCH)
+#if !(defined(powerpc_HOST_ARCH) && defined(linux_HOST_OS))
+    /* The following code applies, with some differences,
+       to all powerpc platforms except for powerpc32-linux,
+       whose calling convention is annoyingly complex.
+    */
+
+
+    /* The code is "almost" the same for
+       32-bit and for 64-bit
+    */
+#if defined(powerpc64_HOST_ARCH)
+#define WS          8
+#define LOAD        ld
+#define STORE       std
+#else
+#define WS          4
+#define LOAD        lwz
+#define STORE       stw
+#endif
+
+    /* Some info about stack frame layout */
+#define LINK_SLOT           (2*WS)
+#define LINKAGE_AREA_SIZE   (6*WS)
+
+    /* The following defines mirror struct AdjustorStub
+       from Adjustor.c. Make sure to keep these in sync.
+    */
+#if defined(powerpc_HOST_ARCH) && defined(darwin_HOST_OS)
+#define HEADER_WORDS   6
+#elif defined(powerpc64_HOST_ARCH) && defined(darwin_HOST_OS)
+#else
+#define HEADER_WORDS   3
+#endif
+
+#define HPTR_OFF        ((HEADER_WORDS    )*WS)
+#define WPTR_OFF        ((HEADER_WORDS + 1)*WS)
+#define FRAMESIZE_OFF   ((HEADER_WORDS + 2)*WS)
+#define EXTRA_WORDS_OFF ((HEADER_WORDS + 3)*WS)
+
+    /* Darwin insists on register names, everyone else prefers
+       to use numbers. */
+#if !defined(darwin_HOST_OS)
+#define r0 0
+#define r1 1
+#define r2 2
+#define r3 3
+#define r4 4
+#define r5 5
+#define r6 6
+#define r7 7
+#define r8 8
+#define r9 9
+#define r10 10
+#define r11 11
+#define r12 12
+
+#define r30 30
+#define r31 31
+#endif
+
+
+.text
+#if LEADING_UNDERSCORE
+    .globl _adjustorCode
+_adjustorCode:
+#else
+    .globl adjustorCode
+        /* Note that we don't build a function descriptor
+           for AIX-derived ABIs here. This will happen at runtime
+           in createAdjustor().
+        */
+adjustorCode:
+#endif
+    /* On entry, r2 will point to the AdjustorStub data structure. */
+
+        /* save the link */
+    mflr    r0
+    STORE   r0, LINK_SLOT(r1)
+    
+        /* set up stack frame */
+    LOAD    r12, FRAMESIZE_OFF(r2)
+#ifdef powerpc64_HOST_ARCH
+    stdux   r1, r1, r12
+#else   
+    stwux   r1, r1, r12
+#endif
+
+        /* Save some regs so that we can use them.
+           Note that we use the "Red Zone" below the stack pointer.
+        */
+    STORE   r31, -WS(r1)
+    STORE   r30, -2*WS(r1)
+
+    mr      r31, r1
+    subf    r30, r12, r31
+
+    LOAD    r12, EXTRA_WORDS_OFF(r2)
+    mtctr   r12
+    b       2f
+1:
+    LOAD    r0, LINKAGE_AREA_SIZE +  8*WS(r30)
+    STORE   r0, LINKAGE_AREA_SIZE + 10*WS(r31)
+    addi    r30, r30, WS
+    addi    r31, r31, WS
+2:
+    bdnz    1b
+
+        /* Restore r30 and r31 now.
+        */
+    LOAD    r31, -WS(r1)
+    LOAD    r30, -2*WS(r1)
+
+    STORE   r10, LINKAGE_AREA_SIZE + 9*WS(r1)
+    STORE   r9,  LINKAGE_AREA_SIZE + 8*WS(r1)
+    mr      r10, r8
+    mr      r9, r7
+    mr      r8, r6
+    mr      r7, r5
+    mr      r6, r4
+    mr      r5, r3
+
+    LOAD    r3, HPTR_OFF(r2)
+
+    LOAD    r12, WPTR_OFF(r2)
+#if defined(darwin_HOST_OS)
+    mtctr   r12
+#else
+    LOAD    r0, 0(r12)
+        /* The function we're calling will never be a nested function,
+           so we don't load r11. 
+        */
+    mtctr   r0
+    LOAD    r2, WS(r12)
+#endif
+    bctrl
+
+    LOAD    r1, 0(r1)
+    LOAD    r0, LINK_SLOT(r1)
+    mtlr    r0
+    blr
+#endif
+
+/* ********************************* i386 ********************************** */
+
+#elif defined(i386_HOST_ARCH) && defined(darwin_HOST_OS)
+
+#define WS              4
+#define RETVAL_OFF      5
+#define HEADER_BYTES    8
+
+#define HPTR_OFF        HEADER_BYTES
+#define WPTR_OFF        (HEADER_BYTES + 1*WS)
+#define FRAMESIZE_OFF   (HEADER_BYTES + 2*WS)
+#define ARGWORDS_OFF    (HEADER_BYTES + 3*WS)
+
+    .globl _adjustorCode
+_adjustorCode:
+    popl    %eax
+    subl    $RETVAL_OFF, %eax
+    
+    pushl   %ebp
+    movl    %esp, %ebp
+    
+    subl    FRAMESIZE_OFF(%eax), %esp
+
+    pushl   %esi
+    pushl   %edi
+        
+    leal    8(%ebp), %esi
+    leal    12(%esp), %edi
+    movl    ARGWORDS_OFF(%eax), %ecx
+    rep
+    movsl
+    
+    popl    %edi
+    popl    %esi
+    
+    pushl   HPTR_OFF(%eax)
+    call    *WPTR_OFF(%eax)
+    
+    leave
+    ret
+#endif
+