diff options
Diffstat (limited to 'xpcom/reflect/xptcall/md/unix/xptcstubs_arm.cpp')
| -rw-r--r-- | xpcom/reflect/xptcall/md/unix/xptcstubs_arm.cpp | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/unix/xptcstubs_arm.cpp b/xpcom/reflect/xptcall/md/unix/xptcstubs_arm.cpp new file mode 100644 index 000000000..ef4f8514d --- /dev/null +++ b/xpcom/reflect/xptcall/md/unix/xptcstubs_arm.cpp @@ -0,0 +1,238 @@ +/* -*- 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" +#include "xptiprivate.h" + +#if !defined(__arm__) && !(defined(LINUX) || defined(ANDROID) || defined(XP_DARWIN)) +#error "This code is for Linux/iOS ARM only. Please check if it works for you, too.\nDepends strongly on gcc behaviour." +#endif + +/* Specify explicitly a symbol for this function, don't try to guess the c++ mangled symbol. */ +static nsresult PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args) asm("_PrepareAndDispatch") +ATTRIBUTE_USED; + +#ifdef __ARM_EABI__ +#define DOUBLEWORD_ALIGN(p) ((uint32_t *)((((uint32_t)(p)) + 7) & 0xfffffff8)) +#else +#define DOUBLEWORD_ALIGN(p) (p) +#endif + +// Apple's iOS toolchain is lame. +#ifdef __APPLE__ +#define GNU(str) +#define APPLE(str) str +#define UNDERSCORE "__" +#else +#define GNU(str) str +#define APPLE(str) +#define UNDERSCORE "_" +#endif + +#ifdef __thumb__ +#define THUMB_FUNC ".thumb_func\n" +#else +#define THUMB_FUNC +#endif + +static nsresult +PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args) +{ +#define PARAM_BUFFER_COUNT 16 + + nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT]; + nsXPTCMiniVariant* dispatchParams = nullptr; + const nsXPTMethodInfo* info; + uint8_t paramCount; + uint8_t i; + nsresult result = NS_ERROR_FAILURE; + + NS_ASSERTION(self,"no self"); + + self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info); + 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"); + + uint32_t* ap = args; + for(i = 0; i < paramCount; i++, ap++) + { + const nsXPTParamInfo& param = info->GetParam(i); + const nsXPTType& type = param.GetType(); + nsXPTCMiniVariant* dp = &dispatchParams[i]; + + if(param.IsOut() || !type.IsArithmetic()) + { + dp->val.p = (void*) *ap; + continue; + } + // else + switch(type) + { + case nsXPTType::T_I8 : dp->val.i8 = *((int8_t*) ap); break; + case nsXPTType::T_I16 : dp->val.i16 = *((int16_t*) ap); break; + case nsXPTType::T_I32 : dp->val.i32 = *((int32_t*) ap); break; + case nsXPTType::T_I64 : ap = DOUBLEWORD_ALIGN(ap); + dp->val.i64 = *((int64_t*) ap); ap++; break; + case nsXPTType::T_U8 : dp->val.u8 = *((uint8_t*) ap); break; + case nsXPTType::T_U16 : dp->val.u16 = *((uint16_t*)ap); break; + case nsXPTType::T_U32 : dp->val.u32 = *((uint32_t*)ap); break; + case nsXPTType::T_U64 : ap = DOUBLEWORD_ALIGN(ap); + dp->val.u64 = *((uint64_t*)ap); ap++; break; + case nsXPTType::T_FLOAT : dp->val.f = *((float*) ap); break; + case nsXPTType::T_DOUBLE : ap = DOUBLEWORD_ALIGN(ap); + dp->val.d = *((double*) ap); ap++; break; + case nsXPTType::T_BOOL : dp->val.b = *((bool*) ap); break; + case nsXPTType::T_CHAR : dp->val.c = *((char*) ap); break; + case nsXPTType::T_WCHAR : dp->val.wc = *((wchar_t*) ap); break; + default: + NS_ERROR("bad type"); + break; + } + } + + result = self->mOuter->CallMethod((uint16_t)methodIndex, info, dispatchParams); + + if(dispatchParams != paramBuffer) + delete [] dispatchParams; + + return result; +} + +/* + * This is our shared stub. + * + * r0 = Self. + * + * The Rules: + * We pass an (undefined) number of arguments into this function. + * The first 3 C++ arguments are in r1 - r3, the rest are built + * by the calling function on the stack. + * + * We are allowed to corrupt r0 - r3, ip, and lr. + * + * Other Info: + * We pass the stub number in using `ip'. + * + * Implementation: + * - We save r1 to r3 inclusive onto the stack, which will be + * immediately below the caller saved arguments. + * - setup r2 (PrepareAndDispatch's args pointer) to point at + * the base of all these arguments + * - Save LR (for the return address) + * - Set r1 (PrepareAndDispatch's methodindex argument) from ip + * - r0 is passed through (self) + * - Call PrepareAndDispatch + * - When the call returns, we return by loading the PC off the + * stack, and undoing the stack (one instruction)! + * + */ +__asm__ ("\n" + GNU(".text\n") + APPLE(".section __TEXT,__text\n") + THUMB_FUNC + ".align 2\n" + "SharedStub:\n" + GNU(".fnstart\n") + GNU(".cfi_startproc\n") + "stmfd sp!, {r1, r2, r3}\n" + GNU(".save {r1, r2, r3}\n") + GNU(".cfi_def_cfa_offset 12\n") + GNU(".cfi_offset r3, -4\n") + GNU(".cfi_offset r2, -8\n") + GNU(".cfi_offset r1, -12\n") + "mov r2, sp\n" + "str lr, [sp, #-4]!\n" + GNU(".save {lr}\n") + GNU(".cfi_def_cfa_offset 16\n") + GNU(".cfi_offset lr, -16\n") + "mov r1, ip\n" + "bl _PrepareAndDispatch\n" + "ldr pc, [sp], #16\n" + GNU(".cfi_endproc\n") + GNU(".fnend")); + +/* + * Create sets of stubs to call the SharedStub. + * We don't touch the stack here, nor any registers, other than IP. + * IP is defined to be corruptable by a called function, so we are + * safe to use it. + * + * This will work with or without optimisation. + */ + +/* + * Note : 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. + * Create names would be like : + * _ZN14nsXPTCStubBase5Stub9Ev + * _ZN14nsXPTCStubBase6Stub13Ev + * _ZN14nsXPTCStubBase7Stub144Ev + * Use the assembler directives to get the names right... + */ + +#define STUB_ENTRY(n) \ + __asm__( \ + GNU(".section \".text\"\n") \ + APPLE(".section __TEXT,__text\n") \ +" .align 2\n" \ +" .if ("#n" - 10) < 0\n" \ +" .globl " UNDERSCORE "ZN14nsXPTCStubBase5Stub"#n"Ev\n" \ + THUMB_FUNC \ + GNU(".type _ZN14nsXPTCStubBase5Stub"#n"Ev,#function\n") \ +UNDERSCORE "ZN14nsXPTCStubBase5Stub"#n"Ev:\n" \ +" .else\n" \ +" .if ("#n" - 100) < 0\n" \ +" .globl " UNDERSCORE "ZN14nsXPTCStubBase6Stub"#n"Ev\n" \ + THUMB_FUNC \ + GNU(".type _ZN14nsXPTCStubBase6Stub"#n"Ev,#function\n") \ +UNDERSCORE "ZN14nsXPTCStubBase6Stub"#n"Ev:\n" \ +" .else\n" \ +" .if ("#n" - 1000) < 0\n" \ +" .globl " UNDERSCORE "ZN14nsXPTCStubBase7Stub"#n"Ev\n" \ + THUMB_FUNC \ + GNU(".type _ZN14nsXPTCStubBase7Stub"#n"Ev,#function\n") \ +UNDERSCORE "ZN14nsXPTCStubBase7Stub"#n"Ev:\n" \ +" .else\n" \ +" .err \"stub number "#n"> 1000 not yet supported\"\n" \ +" .endif\n" \ +" .endif\n" \ +" .endif\n" \ +" mov ip, #"#n"\n" \ +" b SharedStub\n\t"); + +#if 0 +/* + * This part is left in as comment : this is how the method definition + * should look like. + */ + +#define STUB_ENTRY(n) \ +nsresult nsXPTCStubBase::Stub##n () \ +{ \ + __asm__ ( \ +" mov ip, #"#n"\n" \ +" b SharedStub\n\t"); \ + return 0; /* avoid warnings */ \ +} +#endif + + +#define SENTINEL_ENTRY(n) \ +nsresult nsXPTCStubBase::Sentinel##n() \ +{ \ + NS_ERROR("nsXPTCStubBase::Sentinel called"); \ + return NS_ERROR_NOT_IMPLEMENTED; \ +} + +#include "xptcstubsdef.inc" |