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-rw-r--r--xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp280
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diff --git a/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp b/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp
new file mode 100644
index 0000000000..5bbb6f9e5f
--- /dev/null
+++ b/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp
@@ -0,0 +1,280 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Implement shared vtbl methods.
+
+#include "xptcprivate.h"
+
+// Prior to POWER8, all 64-bit Power ISA systems used ELF v1 ABI, found
+// here:
+// https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html
+// and in particular:
+// https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-CALL
+// Little-endian ppc64le, however, uses ELF v2 ABI, which is here:
+// http://openpowerfoundation.org/wp-content/uploads/resources/leabi/leabi-20170510.pdf
+// and in particular section 2.2, page 22. However, most big-endian ppc64
+// systems still use ELF v1, so this file should support both.
+//
+// Both ABIs pass the first 8 integral parameters and the first 13 floating
+// point parameters in registers r3-r10 and f1-f13. No stack space is
+// allocated for these by the caller. The rest of the parameters are passed
+// in the caller's stack area. The stack pointer must stay 16-byte aligned.
+
+const uint32_t GPR_COUNT = 7;
+const uint32_t FPR_COUNT = 13;
+
+// 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.
+//
+// Both ABIs use the same register assignment strategy, as per this
+// example from V1 ABI section 3.2.3 and V2 ABI section 2.2.3.2 [page 43]:
+//
+// typedef struct {
+// int a;
+// double dd;
+// } sparm;
+// sparm s, t;
+// int c, d, e;
+// long double ld;
+// double ff, gg, hh;
+//
+// x = func(c, ff, d, ld, s, gg, t, e, hh);
+//
+// Parameter Register Offset in parameter save area
+// c r3 0-7 (not stored in parameter save area)
+// ff f1 8-15 (not stored)
+// d r5 16-23 (not stored)
+// ld f2,f3 24-39 (not stored)
+// s r8,r9 40-55 (not stored)
+// gg f4 56-63 (not stored)
+// t (none) 64-79 (stored in parameter save area)
+// e (none) 80-87 (stored)
+// hh f5 88-95 (not stored)
+//
+// i.e., each successive FPR usage skips a GPR, but not the other way around.
+
+extern "C" nsresult ATTRIBUTE_USED
+PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
+ uint64_t * args, uint64_t * gpregs, double *fpregs)
+{
+ nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
+ const nsXPTMethodInfo* info;
+ uint32_t paramCount;
+ uint32_t i;
+
+ NS_ASSERTION(self,"no self");
+
+ self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
+ NS_ASSERTION(info,"no method info");
+ if (!info)
+ return NS_ERROR_UNEXPECTED;
+
+ paramCount = info->GetParamCount();
+
+ const uint8_t indexOfJSContext = info->IndexOfJSContext();
+
+ uint64_t* ap = args;
+ // |that| is implicit in the calling convention; we really do start at the
+ // first GPR (as opposed to x86_64).
+ uint32_t nr_gpr = 0;
+ uint32_t nr_fpr = 0;
+ uint64_t value;
+
+ for(i = 0; i < paramCount; i++) {
+ const nsXPTParamInfo& param = info->GetParam(i);
+ const nsXPTType& type = param.GetType();
+ nsXPTCMiniVariant* dp = &paramBuffer[i];
+
+ if (i == indexOfJSContext) {
+ if (nr_gpr < GPR_COUNT)
+ nr_gpr++;
+ else
+ ap++;
+ }
+
+ if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
+ if (nr_fpr < FPR_COUNT) {
+ dp->val.d = fpregs[nr_fpr++];
+ // Even if we have enough FPRs, still skip space in
+ // the parameter area if we ran out of placeholder GPRs.
+ if (nr_gpr < GPR_COUNT) {
+ nr_gpr++;
+ } else {
+ ap++;
+ }
+ } else {
+ dp->val.d = *(double*)ap++;
+ }
+ continue;
+ }
+ if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
+ if (nr_fpr < FPR_COUNT) {
+ // Single-precision floats are passed in FPRs too.
+ dp->val.f = (float)fpregs[nr_fpr++];
+ if (nr_gpr < GPR_COUNT) {
+ nr_gpr++;
+ } else {
+ ap++;
+ }
+ } else {
+#ifdef __LITTLE_ENDIAN__
+ dp->val.f = *(float*)ap++;
+#else
+ // Big endian needs adjustment to point to the least
+ // significant word.
+ float* p = (float*)ap;
+ p++;
+ dp->val.f = *p;
+ ap++;
+#endif
+ }
+ continue;
+ }
+ 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 = (int8_t) value; break;
+ case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break;
+ case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break;
+ case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break;
+ case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break;
+ case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break;
+ case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break;
+ case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break;
+ case nsXPTType::T_BOOL: dp->val.b = (bool) 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_ERROR("bad type");
+ break;
+ }
+ }
+
+ nsresult result = self->mOuter->CallMethod((uint16_t) methodIndex, info,
+ paramBuffer);
+
+ return result;
+}
+
+// Load r11 with the constant 'n' and branch to SharedStub().
+//
+// As G++3 ABI contains the length of the functionname in the mangled
+// name, it is difficult to get a generic assembler mechanism like
+// in the G++ 2.95 case.
+// XXX Yes, it's ugly that we're relying on gcc's name-mangling here;
+// however, it's quick, dirty, and'll break when the ABI changes on
+// us, which is what we want ;-).
+// Create names would be like:
+// _ZN14nsXPTCStubBase5Stub1Ev
+// _ZN14nsXPTCStubBase6Stub12Ev
+// _ZN14nsXPTCStubBase7Stub123Ev
+// _ZN14nsXPTCStubBase8Stub1234Ev
+// etc.
+// Use assembler directives to get the names right.
+
+#if _CALL_ELF == 2
+# 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\n" \
+"_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
+ "0: addis 2,12,.TOC.-0b@ha \n\t" \
+ "addi 2,2,.TOC.-0b@l \n\t" \
+ ".localentry _ZN14nsXPTCStubBase5Stub"#n"Ev,.-_ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
+ \
+ ".elseif "#n" < 100 \n\t" \
+ ".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
+ ".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
+"_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
+ "0: addis 2,12,.TOC.-0b@ha \n\t" \
+ "addi 2,2,.TOC.-0b@l \n\t" \
+ ".localentry _ZN14nsXPTCStubBase6Stub"#n"Ev,.-_ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
+ \
+ ".elseif "#n" < 1000 \n\t" \
+ ".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
+ ".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
+"_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
+ "0: addis 2,12,.TOC.-0b@ha \n\t" \
+ "addi 2,2,.TOC.-0b@l \n\t" \
+ ".localentry _ZN14nsXPTCStubBase7Stub"#n"Ev,.-_ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
+ \
+ ".else \n\t" \
+ ".err \"stub number "#n" >= 1000 not yet supported\"\n" \
+ ".endif \n\t" \
+ \
+ "li 11,"#n" \n\t" \
+ "b SharedStub \n" \
+);
+#else
+# define STUB_ENTRY(n) \
+__asm__ ( \
+ ".section \".toc\",\"aw\" \n\t" \
+ ".section \".text\" \n\t" \
+ ".align 2 \n\t" \
+ ".if "#n" < 10 \n\t" \
+ ".globl _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
+ ".section \".opd\",\"aw\" \n\t" \
+ ".align 3 \n\t" \
+"_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
+ ".quad ._ZN14nsXPTCStubBase5Stub"#n"Ev,.TOC.@tocbase \n\t" \
+ ".previous \n\t" \
+ ".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n" \
+"._ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
+ \
+ ".elseif "#n" < 100 \n\t" \
+ ".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
+ ".section \".opd\",\"aw\" \n\t" \
+ ".align 3 \n\t" \
+"_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
+ ".quad ._ZN14nsXPTCStubBase6Stub"#n"Ev,.TOC.@tocbase \n\t" \
+ ".previous \n\t" \
+ ".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
+"._ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
+ \
+ ".elseif "#n" < 1000 \n\t" \
+ ".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
+ ".section \".opd\",\"aw\" \n\t" \
+ ".align 3 \n\t" \
+"_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
+ ".quad ._ZN14nsXPTCStubBase7Stub"#n"Ev,.TOC.@tocbase \n\t" \
+ ".previous \n\t" \
+ ".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
+"._ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
+ \
+ ".else \n\t" \
+ ".err \"stub number "#n" >= 1000 not yet supported\"\n" \
+ ".endif \n\t" \
+ \
+ "li 11,"#n" \n\t" \
+ "b SharedStub \n" \
+);
+#endif
+
+#define SENTINEL_ENTRY(n) \
+nsresult nsXPTCStubBase::Sentinel##n() \
+{ \
+ NS_ERROR("nsXPTCStubBase::Sentinel called"); \
+ return NS_ERROR_NOT_IMPLEMENTED; \
+}
+
+#include "xptcstubsdef.inc"
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