diff options
Diffstat (limited to 'xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_openbsd.cpp')
| -rw-r--r-- | xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_openbsd.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_openbsd.cpp b/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_openbsd.cpp new file mode 100644 index 000000000..4ec7dd20f --- /dev/null +++ b/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_openbsd.cpp @@ -0,0 +1,183 @@ +/* -*- 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/. */ + +/* Platform specific code to invoke XPCOM methods on native objects */ + +#include "xptcprivate.h" + +// Remember that these 'words' are 32bit DWORDS + +static uint32_t +invoke_count_words(uint32_t paramCount, nsXPTCVariant* s) +{ + uint32_t result = 0; + for(uint32_t i = 0; i < paramCount; i++, s++) + { + if(s->IsPtrData()) + { + result++; + continue; + } + switch(s->type) + { + case nsXPTType::T_I8 : + case nsXPTType::T_I16 : + case nsXPTType::T_I32 : + result++; + break; + case nsXPTType::T_I64 : + result+=2; + break; + case nsXPTType::T_U8 : + case nsXPTType::T_U16 : + case nsXPTType::T_U32 : + result++; + break; + case nsXPTType::T_U64 : + result+=2; + break; + case nsXPTType::T_FLOAT : + result++; + break; + case nsXPTType::T_DOUBLE : + result+=2; + break; + case nsXPTType::T_BOOL : + case nsXPTType::T_CHAR : + case nsXPTType::T_WCHAR : + result++; + break; + default: + // all the others are plain pointer types + result++; + break; + } + } + return result; +} + +static void +invoke_copy_to_stack(uint32_t* d, uint32_t paramCount, nsXPTCVariant* s) +{ + for(uint32_t i = 0; i < paramCount; i++, d++, s++) + { + if(s->IsPtrData()) + { + *((void**)d) = s->ptr; + continue; + } + switch(s->type) + { + case nsXPTType::T_I8 : *((int8_t*) d) = s->val.i8; break; + case nsXPTType::T_I16 : *((int16_t*) d) = s->val.i16; break; + case nsXPTType::T_I32 : *((int32_t*) d) = s->val.i32; break; + case nsXPTType::T_I64 : *((int64_t*) d) = s->val.i64; d++; break; + case nsXPTType::T_U8 : *((uint8_t*) d) = s->val.u8; break; + case nsXPTType::T_U16 : *((uint16_t*)d) = s->val.u16; break; + case nsXPTType::T_U32 : *((uint32_t*)d) = s->val.u32; break; + case nsXPTType::T_U64 : *((uint64_t*)d) = s->val.u64; d++; break; + case nsXPTType::T_FLOAT : *((float*) d) = s->val.f; break; + case nsXPTType::T_DOUBLE : *((double*) d) = s->val.d; d++; break; + case nsXPTType::T_BOOL : *((bool*) d) = s->val.b; break; + case nsXPTType::T_CHAR : *((char*) d) = s->val.c; break; + case nsXPTType::T_WCHAR : *((wchar_t*) d) = s->val.wc; break; + default: + // all the others are plain pointer types + *((void**)d) = s->val.p; + break; + } + } +} + +extern "C" { + struct my_params_struct { + nsISupports* that; + uint32_t Index; + uint32_t Count; + nsXPTCVariant* params; + uint32_t fn_count; + uint32_t fn_copy; + }; +} + +EXPORT_XPCOM_API(nsresult) +NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex, + uint32_t paramCount, nsXPTCVariant* params) +{ + uint32_t result; + struct my_params_struct my_params; + my_params.that = that; + my_params.Index = methodIndex; + my_params.Count = paramCount; + my_params.params = params; + my_params.fn_copy = (uint32_t) &invoke_copy_to_stack; + my_params.fn_count = (uint32_t) &invoke_count_words; + +/* This is to call a given method of class that. + * The parameters are in params, the number is in paramCount. + * The routine will issue calls to count the number of words + * required for argument passing and to copy the arguments to + * the stack. + * Since APCS passes the first 3 params in r1-r3, we need to + * load the first three words from the stack and correct the stack + * pointer (sp) in the appropriate way. This means: + * + * 1.) more than 3 arguments: load r1-r3, correct sp and remember No. + * of bytes left on the stack in r4 + * + * 2.) <= 2 args: load r1-r3 (we won't be causing a stack overflow I hope), + * restore sp as if nothing had happened and set the marker r4 to zero. + * + * Afterwards sp will be restored using the value in r4 (which is not a temporary register + * and will be preserved by the function/method called according to APCS [ARM Procedure + * Calling Standard]). + * + * !!! IMPORTANT !!! + * This routine makes assumptions about the vtable layout of the c++ compiler. It's implemented + * for arm-linux GNU g++ >= 2.8.1 (including egcs and gcc-2.95.[1-3])! + * + */ + +#ifdef __GNUC__ + __asm__ __volatile__( + "ldr r1, [%1, #12] \n\t" /* prepare to call invoke_count_words */ + "ldr ip, [%1, #16] \n\t" /* r0=paramCount, r1=params */ + "ldr r0, [%1, #8] \n\t" + "mov lr, pc \n\t" /* call it... */ + "mov pc, ip \n\t" + "mov r4, r0, lsl #2 \n\t" /* This is the amount of bytes needed. */ + "sub sp, sp, r4 \n\t" /* use stack space for the args... */ + "mov r0, sp \n\t" /* prepare a pointer an the stack */ + "ldr r1, [%1, #8] \n\t" /* =paramCount */ + "ldr r2, [%1, #12] \n\t" /* =params */ + "ldr ip, [%1, #20] \n\t" /* =invoke_copy_to_stack */ + "mov lr, pc \n\t" /* copy args to the stack like the */ + "mov pc, ip \n\t" /* compiler would. */ + "ldr r0, [%1] \n\t" /* =that */ + "ldr r1, [r0, #0] \n\t" /* get that->vtable offset */ + "ldr r2, [%1, #4] \n\t" + "mov r2, r2, lsl #2 \n\t" /* a vtable_entry(x)=8 + (4 bytes * x) */ + "ldr ip, [r1, r2] \n\t" /* get method adress from vtable */ + "cmp r4, #12 \n\t" /* more than 3 arguments??? */ + "ldmgtia sp!, {r1, r2, r3}\n\t" /* yes: load arguments for r1-r3 */ + "subgt r4, r4, #12 \n\t" /* and correct the stack pointer */ + "ldmleia sp, {r1, r2, r3}\n\t" /* no: load r1-r3 from stack */ + "addle sp, sp, r4 \n\t" /* and restore stack pointer */ + "movle r4, #0 \n\t" /* a mark for restoring sp */ + "ldr r0, [%1, #0] \n\t" /* get (self) */ + "mov lr, pc \n\t" /* call mathod */ + "mov pc, ip \n\t" + "add sp, sp, r4 \n\t" /* restore stack pointer */ + "mov %0, r0 \n\t" /* the result... */ + : "=r" (result) + : "r" (&my_params), "m" (my_params) + : "r0", "r1", "r2", "r3", "r4", "ip", "lr", "sp" + ); +#else +#error "Unsupported compiler. Use g++ >= 2.8 for OpenBSD/arm." +#endif /* G++ >= 2.8 */ + + return result; +} |