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-rw-r--r--xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_netbsd.cpp181
1 files changed, 181 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_netbsd.cpp b/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_netbsd.cpp
new file mode 100644
index 0000000000..2624c1e892
--- /dev/null
+++ b/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm_netbsd.cpp
@@ -0,0 +1,181 @@
+/* -*- 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;
+};
+
+XPTC_PUBLIC_API(nsresult)
+XPTC_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])!
+ *
+ */
+
+ __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"
+ "add r2, r1, r2, lsl #3\n\t" /* a vtable_entry(x)=8 + (8 bytes * x) */
+ "add r2, r2, #8 \n\t" /* with this compilers */
+ "ldr r3, [r2] \n\t" /* get virtual offset from vtable */
+ "mov r3, r3, lsl #16 \n\t"
+ "add r0, r0, r3, asr #16\n\t"
+ "ldr ip, [r2, #4] \n\t" /* get method address 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 */
+ "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)
+ : "r0", "r1", "r2", "r3", "r4", "ip", "lr"
+ );
+
+ return result;
+}