1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_arm_openbsd.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,183 @@
1.4 +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* Platform specific code to invoke XPCOM methods on native objects */
1.10 +
1.11 +#include "xptcprivate.h"
1.12 +
1.13 +// Remember that these 'words' are 32bit DWORDS
1.14 +
1.15 +static uint32_t
1.16 +invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
1.17 +{
1.18 + uint32_t result = 0;
1.19 + for(uint32_t i = 0; i < paramCount; i++, s++)
1.20 + {
1.21 + if(s->IsPtrData())
1.22 + {
1.23 + result++;
1.24 + continue;
1.25 + }
1.26 + switch(s->type)
1.27 + {
1.28 + case nsXPTType::T_I8 :
1.29 + case nsXPTType::T_I16 :
1.30 + case nsXPTType::T_I32 :
1.31 + result++;
1.32 + break;
1.33 + case nsXPTType::T_I64 :
1.34 + result+=2;
1.35 + break;
1.36 + case nsXPTType::T_U8 :
1.37 + case nsXPTType::T_U16 :
1.38 + case nsXPTType::T_U32 :
1.39 + result++;
1.40 + break;
1.41 + case nsXPTType::T_U64 :
1.42 + result+=2;
1.43 + break;
1.44 + case nsXPTType::T_FLOAT :
1.45 + result++;
1.46 + break;
1.47 + case nsXPTType::T_DOUBLE :
1.48 + result+=2;
1.49 + break;
1.50 + case nsXPTType::T_BOOL :
1.51 + case nsXPTType::T_CHAR :
1.52 + case nsXPTType::T_WCHAR :
1.53 + result++;
1.54 + break;
1.55 + default:
1.56 + // all the others are plain pointer types
1.57 + result++;
1.58 + break;
1.59 + }
1.60 + }
1.61 + return result;
1.62 +}
1.63 +
1.64 +static void
1.65 +invoke_copy_to_stack(uint32_t* d, uint32_t paramCount, nsXPTCVariant* s)
1.66 +{
1.67 + for(uint32_t i = 0; i < paramCount; i++, d++, s++)
1.68 + {
1.69 + if(s->IsPtrData())
1.70 + {
1.71 + *((void**)d) = s->ptr;
1.72 + continue;
1.73 + }
1.74 + switch(s->type)
1.75 + {
1.76 + case nsXPTType::T_I8 : *((int8_t*) d) = s->val.i8; break;
1.77 + case nsXPTType::T_I16 : *((int16_t*) d) = s->val.i16; break;
1.78 + case nsXPTType::T_I32 : *((int32_t*) d) = s->val.i32; break;
1.79 + case nsXPTType::T_I64 : *((int64_t*) d) = s->val.i64; d++; break;
1.80 + case nsXPTType::T_U8 : *((uint8_t*) d) = s->val.u8; break;
1.81 + case nsXPTType::T_U16 : *((uint16_t*)d) = s->val.u16; break;
1.82 + case nsXPTType::T_U32 : *((uint32_t*)d) = s->val.u32; break;
1.83 + case nsXPTType::T_U64 : *((uint64_t*)d) = s->val.u64; d++; break;
1.84 + case nsXPTType::T_FLOAT : *((float*) d) = s->val.f; break;
1.85 + case nsXPTType::T_DOUBLE : *((double*) d) = s->val.d; d++; break;
1.86 + case nsXPTType::T_BOOL : *((bool*) d) = s->val.b; break;
1.87 + case nsXPTType::T_CHAR : *((char*) d) = s->val.c; break;
1.88 + case nsXPTType::T_WCHAR : *((wchar_t*) d) = s->val.wc; break;
1.89 + default:
1.90 + // all the others are plain pointer types
1.91 + *((void**)d) = s->val.p;
1.92 + break;
1.93 + }
1.94 + }
1.95 +}
1.96 +
1.97 +extern "C" {
1.98 + struct my_params_struct {
1.99 + nsISupports* that;
1.100 + uint32_t Index;
1.101 + uint32_t Count;
1.102 + nsXPTCVariant* params;
1.103 + uint32_t fn_count;
1.104 + uint32_t fn_copy;
1.105 + };
1.106 +}
1.107 +
1.108 +EXPORT_XPCOM_API(nsresult)
1.109 +NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
1.110 + uint32_t paramCount, nsXPTCVariant* params)
1.111 +{
1.112 + uint32_t result;
1.113 + struct my_params_struct my_params;
1.114 + my_params.that = that;
1.115 + my_params.Index = methodIndex;
1.116 + my_params.Count = paramCount;
1.117 + my_params.params = params;
1.118 + my_params.fn_copy = (uint32_t) &invoke_copy_to_stack;
1.119 + my_params.fn_count = (uint32_t) &invoke_count_words;
1.120 +
1.121 +/* This is to call a given method of class that.
1.122 + * The parameters are in params, the number is in paramCount.
1.123 + * The routine will issue calls to count the number of words
1.124 + * required for argument passing and to copy the arguments to
1.125 + * the stack.
1.126 + * Since APCS passes the first 3 params in r1-r3, we need to
1.127 + * load the first three words from the stack and correct the stack
1.128 + * pointer (sp) in the appropriate way. This means:
1.129 + *
1.130 + * 1.) more than 3 arguments: load r1-r3, correct sp and remember No.
1.131 + * of bytes left on the stack in r4
1.132 + *
1.133 + * 2.) <= 2 args: load r1-r3 (we won't be causing a stack overflow I hope),
1.134 + * restore sp as if nothing had happened and set the marker r4 to zero.
1.135 + *
1.136 + * Afterwards sp will be restored using the value in r4 (which is not a temporary register
1.137 + * and will be preserved by the function/method called according to APCS [ARM Procedure
1.138 + * Calling Standard]).
1.139 + *
1.140 + * !!! IMPORTANT !!!
1.141 + * This routine makes assumptions about the vtable layout of the c++ compiler. It's implemented
1.142 + * for arm-linux GNU g++ >= 2.8.1 (including egcs and gcc-2.95.[1-3])!
1.143 + *
1.144 + */
1.145 +
1.146 +#ifdef __GNUC__
1.147 + __asm__ __volatile__(
1.148 + "ldr r1, [%1, #12] \n\t" /* prepare to call invoke_count_words */
1.149 + "ldr ip, [%1, #16] \n\t" /* r0=paramCount, r1=params */
1.150 + "ldr r0, [%1, #8] \n\t"
1.151 + "mov lr, pc \n\t" /* call it... */
1.152 + "mov pc, ip \n\t"
1.153 + "mov r4, r0, lsl #2 \n\t" /* This is the amount of bytes needed. */
1.154 + "sub sp, sp, r4 \n\t" /* use stack space for the args... */
1.155 + "mov r0, sp \n\t" /* prepare a pointer an the stack */
1.156 + "ldr r1, [%1, #8] \n\t" /* =paramCount */
1.157 + "ldr r2, [%1, #12] \n\t" /* =params */
1.158 + "ldr ip, [%1, #20] \n\t" /* =invoke_copy_to_stack */
1.159 + "mov lr, pc \n\t" /* copy args to the stack like the */
1.160 + "mov pc, ip \n\t" /* compiler would. */
1.161 + "ldr r0, [%1] \n\t" /* =that */
1.162 + "ldr r1, [r0, #0] \n\t" /* get that->vtable offset */
1.163 + "ldr r2, [%1, #4] \n\t"
1.164 + "mov r2, r2, lsl #2 \n\t" /* a vtable_entry(x)=8 + (4 bytes * x) */
1.165 + "ldr ip, [r1, r2] \n\t" /* get method adress from vtable */
1.166 + "cmp r4, #12 \n\t" /* more than 3 arguments??? */
1.167 + "ldmgtia sp!, {r1, r2, r3}\n\t" /* yes: load arguments for r1-r3 */
1.168 + "subgt r4, r4, #12 \n\t" /* and correct the stack pointer */
1.169 + "ldmleia sp, {r1, r2, r3}\n\t" /* no: load r1-r3 from stack */
1.170 + "addle sp, sp, r4 \n\t" /* and restore stack pointer */
1.171 + "movle r4, #0 \n\t" /* a mark for restoring sp */
1.172 + "ldr r0, [%1, #0] \n\t" /* get (self) */
1.173 + "mov lr, pc \n\t" /* call mathod */
1.174 + "mov pc, ip \n\t"
1.175 + "add sp, sp, r4 \n\t" /* restore stack pointer */
1.176 + "mov %0, r0 \n\t" /* the result... */
1.177 + : "=r" (result)
1.178 + : "r" (&my_params), "m" (my_params)
1.179 + : "r0", "r1", "r2", "r3", "r4", "ip", "lr", "sp"
1.180 + );
1.181 +#else
1.182 +#error "Unsupported compiler. Use g++ >= 2.8 for OpenBSD/arm."
1.183 +#endif /* G++ >= 2.8 */
1.184 +
1.185 + return result;
1.186 +}
