path: root/www/libxul/files/patch-xptcall-amd64

--- xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_freebsd.cpp.orig 2009-10-02 22:13:13.000000000 +0200
+++ xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_freebsd.cpp  2009-10-02 22:41:36.000000000 +0200
@@ -0,0 +1,174 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+// Platform specific code to invoke XPCOM methods on native objects
+
+#include "xptcprivate.h"
+
+// 6 integral parameters are passed in registers
+const PRUint32 GPR_COUNT = 6;
+
+// 8 floating point parameters are passed in SSE registers
+const PRUint32 FPR_COUNT = 8;
+
+// Remember that these 'words' are 64-bit long
+static inline void
+invoke_count_words(PRUint32 paramCount, nsXPTCVariant * s,
+                   PRUint32 & nr_gpr, PRUint32 & nr_fpr, PRUint32 & nr_stack)
+{
+    nr_gpr = 1; // skip one GP register for 'that'
+    nr_fpr = 0;
+    nr_stack = 0;
+
+    /* Compute number of eightbytes of class MEMORY.  */
+    for (uint32 i = 0; i < paramCount; i++, s++) {
+        if (!s->IsPtrData()
+            && (s->type == nsXPTType::T_FLOAT || s->type == nsXPTType::T_DOUBLE)) {
+            if (nr_fpr < FPR_COUNT)
+                nr_fpr++;
+            else
+                nr_stack++;
+        }
+        else {
+            if (nr_gpr < GPR_COUNT)
+                nr_gpr++;
+            else
+                nr_stack++;
+        }
+    }
+}
+
+static void
+invoke_copy_to_stack(PRUint64 * d, PRUint32 paramCount, nsXPTCVariant * s,
+                     PRUint64 * gpregs, double * fpregs)
+{
+    PRUint32 nr_gpr = 1; // skip one GP register for 'that'
+    PRUint32 nr_fpr = 0;
+    PRUint64 value;
+
+    for (uint32 i = 0; i < paramCount; i++, s++) {
+        if (s->IsPtrData())
+            value = (PRUint64) s->ptr;
+        else {
+            switch (s->type) {
+            case nsXPTType::T_FLOAT:                                break;
+            case nsXPTType::T_DOUBLE:                               break;
+            case nsXPTType::T_I8:     value = s->val.i8;            break;
+            case nsXPTType::T_I16:    value = s->val.i16;           break;
+            case nsXPTType::T_I32:    value = s->val.i32;           break;
+            case nsXPTType::T_I64:    value = s->val.i64;           break;
+            case nsXPTType::T_U8:     value = s->val.u8;            break;
+            case nsXPTType::T_U16:    value = s->val.u16;           break;
+            case nsXPTType::T_U32:    value = s->val.u32;           break;
+            case nsXPTType::T_U64:    value = s->val.u64;           break;
+            case nsXPTType::T_BOOL:   value = s->val.b;             break;
+            case nsXPTType::T_CHAR:   value = s->val.c;             break;
+            case nsXPTType::T_WCHAR:  value = s->val.wc;            break;
+            default:                  value = (PRUint64) s->val.p;  break;
+            }
+        }
+
+        if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
+            if (nr_fpr < FPR_COUNT)
+                fpregs[nr_fpr++] = s->val.d;
+            else {
+                *((double *)d) = s->val.d;
+                d++;
+            }
+        }
+        else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
+            if (nr_fpr < FPR_COUNT)
+                // The value in %xmm register is already prepared to
+                // be retrieved as a float. Therefore, we pass the
+                // value verbatim, as a double without conversion.
+                fpregs[nr_fpr++] = s->val.d;
+            else {
+                *((float *)d) = s->val.f;
+                d++;
+            }
+        }
+        else {
+            if (nr_gpr < GPR_COUNT)
+                gpregs[nr_gpr++] = value;
+            else
+                *d++ = value;
+        }
+    }
+}
+
+extern "C"
+EXPORT_XPCOM_API(nsresult)
+NS_InvokeByIndex_P(nsISupports * that, PRUint32 methodIndex,
+                   PRUint32 paramCount, nsXPTCVariant * params)
+{
+    PRUint32 nr_gpr, nr_fpr, nr_stack;
+    invoke_count_words(paramCount, params, nr_gpr, nr_fpr, nr_stack);
+    
+    // Stack, if used, must be 16-bytes aligned
+    if (nr_stack)
+        nr_stack = (nr_stack + 1) & ~1;
+
+    // Load parameters to stack, if necessary
+    PRUint64 *stack = (PRUint64 *) __builtin_alloca(nr_stack * 8);
+    PRUint64 gpregs[GPR_COUNT];
+    double fpregs[FPR_COUNT];
+    invoke_copy_to_stack(stack, paramCount, params, gpregs, fpregs);
+
+    // Load FPR registers from fpregs[]
+    register double d0 asm("xmm0");
+    register double d1 asm("xmm1");
+    register double d2 asm("xmm2");
+    register double d3 asm("xmm3");
+    register double d4 asm("xmm4");
+    register double d5 asm("xmm5");
+    register double d6 asm("xmm6");
+    register double d7 asm("xmm7");
+
+    switch (nr_fpr) {
+#define ARG_FPR(N) \
+    case N+1: d##N = fpregs[N];
+        ARG_FPR(7);
+        ARG_FPR(6);
+        ARG_FPR(5);
+        ARG_FPR(4);
+        ARG_FPR(3);
+        ARG_FPR(2);
+        ARG_FPR(1);
+        ARG_FPR(0);
+    case 0:;
+#undef ARG_FPR
+    }
+    
+    // Load GPR registers from gpregs[]
+    register PRUint64 a0 asm("rdi");
+    register PRUint64 a1 asm("rsi");
+    register PRUint64 a2 asm("rdx");
+    register PRUint64 a3 asm("rcx");
+    register PRUint64 a4 asm("r8");
+    register PRUint64 a5 asm("r9");
+    
+    switch (nr_gpr) {
+#define ARG_GPR(N) \
+    case N+1: a##N = gpregs[N];
+        ARG_GPR(5);
+        ARG_GPR(4);
+        ARG_GPR(3);
+        ARG_GPR(2);
+        ARG_GPR(1);
+    case 1: a0 = (PRUint64) that;
+    case 0:;
+#undef ARG_GPR
+    }
+
+    // Ensure that assignments to SSE registers won't be optimized away
+    asm("" ::
+        "x" (d0), "x" (d1), "x" (d2), "x" (d3),
+        "x" (d4), "x" (d5), "x" (d6), "x" (d7));
+    
+    // Get pointer to method
+    PRUint64 methodAddress = *((PRUint64 *)that);
+    methodAddress += 8 * methodIndex;
+    methodAddress = *((PRUint64 *)methodAddress);
+    
+    typedef PRUint32 (*Method)(PRUint64, PRUint64, PRUint64, PRUint64, PRUint64, PRUint64);
+    PRUint32 result = ((Method)methodAddress)(a0, a1, a2, a3, a4, a5);
+    return result;
+}
--- xpcom/reflect/xptcall/src/md/unix/xptcstubs_amd64_freebsd.cpp.orig  2009-10-02 22:13:13.000000000 +0200
+++ xpcom/reflect/xptcall/src/md/unix/xptcstubs_amd64_freebsd.cpp   2009-10-02 22:39:37.000000000 +0200
@@ -0,0 +1,200 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+// Implement shared vtbl methods.
+
+#include "xptcprivate.h"
+#include "xptiprivate.h"
+
+// The Linux/x86-64 ABI passes the first 6 integral parameters and the
+// first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
+// r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
+// caller.  The rest of the parameters are passed in the callers stack
+// area.
+
+const PRUint32 PARAM_BUFFER_COUNT   = 16;
+const PRUint32 GPR_COUNT            = 6;
+const PRUint32 FPR_COUNT            = 8;
+
+// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
+//
+// - 'args[]' contains the arguments passed on stack
+// - 'gpregs[]' contains the arguments passed in integer registers
+// - 'fpregs[]' contains the arguments passed in floating point registers
+// 
+// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
+// and then the method gets called.
+
+extern "C" nsresult
+PrepareAndDispatch(nsXPTCStubBase * self, PRUint32 methodIndex,
+                   PRUint64 * args, PRUint64 * gpregs, double *fpregs)
+{
+    nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
+    nsXPTCMiniVariant* dispatchParams = NULL;
+    const nsXPTMethodInfo* info;
+    PRUint32 paramCount;
+    PRUint32 i;
+    nsresult result = NS_ERROR_FAILURE;
+
+    NS_ASSERTION(self,"no self");
+
+    self->mEntry->GetMethodInfo(PRUint16(methodIndex), &info);
+    NS_ASSERTION(info,"no method info");
+    if (! info)
+        return NS_ERROR_UNEXPECTED;
+
+    paramCount = info->GetParamCount();
+
+    // setup variant array pointer
+    if(paramCount > PARAM_BUFFER_COUNT)
+        dispatchParams = new nsXPTCMiniVariant[paramCount];
+    else
+        dispatchParams = paramBuffer;
+
+    NS_ASSERTION(dispatchParams,"no place for params");
+    if (! dispatchParams)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    PRUint64* ap = args;
+    PRUint32 nr_gpr = 1;    // skip one GPR register for 'that'
+    PRUint32 nr_fpr = 0;
+    PRUint64 value;
+
+    for(i = 0; i < paramCount; i++) {
+        const nsXPTParamInfo& param = info->GetParam(i);
+        const nsXPTType& type = param.GetType();
+        nsXPTCMiniVariant* dp = &dispatchParams[i];
+   
+        if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
+            if (nr_fpr < FPR_COUNT)
+                dp->val.d = fpregs[nr_fpr++];
+            else
+                dp->val.d = *(double*) ap++;
+            continue;
+        }
+        else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
+            if (nr_fpr < FPR_COUNT)
+                // The value in %xmm register is already prepared to
+                // be retrieved as a float. Therefore, we pass the
+                // value verbatim, as a double without conversion.
+                dp->val.d = *(double*) ap++;
+            else
+                dp->val.f = *(float*) ap++;
+            continue;
+        }
+        else {
+            if (nr_gpr < GPR_COUNT)
+                value = gpregs[nr_gpr++];
+            else
+                value = *ap++;
+        }
+
+        if (param.IsOut() || !type.IsArithmetic()) {
+            dp->val.p = (void*) value;
+            continue;
+        }
+
+        switch (type) {
+        case nsXPTType::T_I8:      dp->val.i8  = (PRInt8)   value; break;
+        case nsXPTType::T_I16:     dp->val.i16 = (PRInt16)  value; break;
+        case nsXPTType::T_I32:     dp->val.i32 = (PRInt32)  value; break;
+        case nsXPTType::T_I64:     dp->val.i64 = (PRInt64)  value; break;
+        case nsXPTType::T_U8:      dp->val.u8  = (PRUint8)  value; break;
+        case nsXPTType::T_U16:     dp->val.u16 = (PRUint16) value; break;
+        case nsXPTType::T_U32:     dp->val.u32 = (PRUint32) value; break;
+        case nsXPTType::T_U64:     dp->val.u64 = (PRUint64) value; break;
+        case nsXPTType::T_BOOL:    dp->val.b   = (PRBool)   value; break;
+        case nsXPTType::T_CHAR:    dp->val.c   = (char)     value; break;
+        case nsXPTType::T_WCHAR:   dp->val.wc  = (wchar_t)  value; break;
+
+        default:
+            NS_ASSERTION(0, "bad type");
+            break;
+        }
+    }
+
+    result = self->mOuter->CallMethod((PRUint16)methodIndex, info,
+                                      dispatchParams);
+
+    if (dispatchParams != paramBuffer)
+        delete [] dispatchParams;
+
+    return result;
+}
+
+#if defined(__GXX_ABI_VERSION) && __GXX_ABI_VERSION >= 100 /* G++ V3 ABI */
+// Linux/x86-64 uses gcc >= 3.1
+#define STUB_ENTRY(n) \
+asm(".section  \".text\"\n\t" \
+    ".align    2\n\t" \
+    ".if   " #n " < 10\n\t" \
+    ".globl    _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
+    ".type _ZN14nsXPTCStubBase5Stub" #n "Ev,@function\n" \
+    "_ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
+    ".elseif   " #n " < 100\n\t" \
+    ".globl    _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
+    ".type _ZN14nsXPTCStubBase6Stub" #n "Ev,@function\n" \
+    "_ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
+    ".elseif    " #n " < 1000\n\t" \
+    ".globl     _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
+    ".type      _ZN14nsXPTCStubBase7Stub" #n "Ev,@function\n" \
+    "_ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
+    ".else\n\t" \
+    ".err  \"stub number " #n " >= 1000 not yet supported\"\n\t" \
+    ".endif\n\t" \
+    "movl  $" #n ", %eax\n\t" \
+    "jmp   SharedStub\n\t" \
+    ".if   " #n " < 10\n\t" \
+    ".size _ZN14nsXPTCStubBase5Stub" #n "Ev,.-_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
+    ".elseif   " #n " < 100\n\t" \
+    ".size _ZN14nsXPTCStubBase6Stub" #n "Ev,.-_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
+    ".else\n\t" \
+    ".size _ZN14nsXPTCStubBase7Stub" #n "Ev,.-_ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
+    ".endif");
+
+// static nsresult SharedStub(PRUint32 methodIndex)
+asm(".section   \".text\"\n\t"
+    ".align     2\n\t"
+    ".type      SharedStub,@function\n\t"
+    "SharedStub:\n\t"
+    // make room for gpregs (48), fpregs (64)
+    "pushq      %rbp\n\t"
+    "movq       %rsp,%rbp\n\t"
+    "subq       $112,%rsp\n\t"
+    // save GP registers
+    "movq       %rdi,-112(%rbp)\n\t"
+    "movq       %rsi,-104(%rbp)\n\t"
+    "movq       %rdx, -96(%rbp)\n\t"
+    "movq       %rcx, -88(%rbp)\n\t"
+    "movq       %r8 , -80(%rbp)\n\t"
+    "movq       %r9 , -72(%rbp)\n\t"
+    "leaq       -112(%rbp),%rcx\n\t"
+    // save FP registers
+    "movsd      %xmm0,-64(%rbp)\n\t"
+    "movsd      %xmm1,-56(%rbp)\n\t"
+    "movsd      %xmm2,-48(%rbp)\n\t"
+    "movsd      %xmm3,-40(%rbp)\n\t"
+    "movsd      %xmm4,-32(%rbp)\n\t"
+    "movsd      %xmm5,-24(%rbp)\n\t"
+    "movsd      %xmm6,-16(%rbp)\n\t"
+    "movsd      %xmm7, -8(%rbp)\n\t"
+    "leaq       -64(%rbp),%r8\n\t"
+    // rdi has the 'self' pointer already
+    "movl       %eax,%esi\n\t"
+    "leaq       16(%rbp),%rdx\n\t"
+    "call       PrepareAndDispatch\n\t"
+    "leave\n\t"
+    "ret\n\t"
+    ".size      SharedStub,.-SharedStub");
+
+#define SENTINEL_ENTRY(n) \
+nsresult nsXPTCStubBase::Sentinel##n() \
+{ \
+    NS_ASSERTION(0,"nsXPTCStubBase::Sentinel called"); \
+    return NS_ERROR_NOT_IMPLEMENTED; \
+}
+
+#include "xptcstubsdef.inc"
+
+#else
+#error "can't find a compiler to use"
+#endif /* __GNUC__ */