1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /* Platform specific code to invoke XPCOM methods on native objects */
7
8 #include "xptcprivate.h"
9
10 /* Prototype specifies unmangled function name and disables unused warning */
11 static void
12 invoke_copy_to_stack(uint64_t* d, uint32_t paramCount, nsXPTCVariant* s)
13 __asm__("invoke_copy_to_stack") __attribute__((used));
14
15 static void
invoke_copy_to_stack(uint64_t * d,uint32_t paramCount,nsXPTCVariant * s)16 invoke_copy_to_stack(uint64_t* d, uint32_t paramCount, nsXPTCVariant* s)
17 {
18 const uint8_t NUM_ARG_REGS = 6-1; // -1 for "this" pointer
19
20 for(uint32_t i = 0; i < paramCount; i++, d++, s++)
21 {
22 if(s->IsPtrData())
23 {
24 *d = (uint64_t)s->ptr;
25 continue;
26 }
27 switch(s->type)
28 {
29 case nsXPTType::T_I8 : *d = (uint64_t)s->val.i8; break;
30 case nsXPTType::T_I16 : *d = (uint64_t)s->val.i16; break;
31 case nsXPTType::T_I32 : *d = (uint64_t)s->val.i32; break;
32 case nsXPTType::T_I64 : *d = (uint64_t)s->val.i64; break;
33 case nsXPTType::T_U8 : *d = (uint64_t)s->val.u8; break;
34 case nsXPTType::T_U16 : *d = (uint64_t)s->val.u16; break;
35 case nsXPTType::T_U32 : *d = (uint64_t)s->val.u32; break;
36 case nsXPTType::T_U64 : *d = (uint64_t)s->val.u64; break;
37 case nsXPTType::T_FLOAT :
38 if(i < NUM_ARG_REGS)
39 {
40 // convert floats to doubles if they are to be passed
41 // via registers so we can just deal with doubles later
42 union { uint64_t u64; double d; } t;
43 t.d = (double)s->val.f;
44 *d = t.u64;
45 }
46 else
47 // otherwise copy to stack normally
48 *d = (uint64_t)s->val.u32;
49 break;
50 case nsXPTType::T_DOUBLE : *d = (uint64_t)s->val.u64; break;
51 case nsXPTType::T_BOOL : *d = (uint64_t)s->val.b; break;
52 case nsXPTType::T_CHAR : *d = (uint64_t)s->val.c; break;
53 case nsXPTType::T_WCHAR : *d = (uint64_t)s->val.wc; break;
54 default:
55 // all the others are plain pointer types
56 *d = (uint64_t)s->val.p;
57 break;
58 }
59 }
60 }
61
62 /*
63 * EXPORT_XPCOM_API(nsresult)
64 * NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
65 * uint32_t paramCount, nsXPTCVariant* params)
66 */
67 __asm__(
68 "#### NS_InvokeByIndex ####\n"
69 ".text\n\t"
70 ".align 5\n\t"
71 ".globl NS_InvokeByIndex\n\t"
72 ".ent NS_InvokeByIndex\n"
73 "NS_InvokeByIndex:\n\t"
74 ".frame $15,32,$26,0\n\t"
75 ".mask 0x4008000,-32\n\t"
76 "ldgp $29,0($27)\n"
77 "$NS_InvokeByIndex..ng:\n\t"
78 "subq $30,32,$30\n\t"
79 "stq $26,0($30)\n\t"
80 "stq $15,8($30)\n\t"
81 "bis $30,$30,$15\n\t"
82 ".prologue 1\n\t"
83
84 /*
85 * Allocate enough stack space to hold the greater of 6 or "paramCount"+1
86 * parameters. (+1 for "this" pointer) Room for at least 6 parameters
87 * is required for storage of those passed via registers.
88 */
89
90 "bis $31,5,$2\n\t" /* count = MAX(5, "paramCount") */
91 "cmplt $2,$18,$1\n\t"
92 "cmovne $1,$18,$2\n\t"
93 "s8addq $2,16,$1\n\t" /* room for count+1 params (8 bytes each) */
94 "bic $1,15,$1\n\t" /* stack space is rounded up to 0 % 16 */
95 "subq $30,$1,$30\n\t"
96
97 "stq $16,0($30)\n\t" /* save "that" (as "this" pointer) */
98 "stq $17,16($15)\n\t" /* save "methodIndex" */
99
100 "addq $30,8,$16\n\t" /* pass stack pointer */
101 "bis $18,$18,$17\n\t" /* pass "paramCount" */
102 "bis $19,$19,$18\n\t" /* pass "params" */
103 "bsr $26,$invoke_copy_to_stack..ng\n\t" /* call invoke_copy_to_stack */
104
105 /*
106 * Copy the first 6 parameters to registers and remove from stack frame.
107 * Both the integer and floating point registers are set for each parameter
108 * except the first which is the "this" pointer. (integer only)
109 * The floating point registers are all set as doubles since the
110 * invoke_copy_to_stack function should have converted the floats.
111 */
112 "ldq $16,0($30)\n\t" /* integer registers */
113 "ldq $17,8($30)\n\t"
114 "ldq $18,16($30)\n\t"
115 "ldq $19,24($30)\n\t"
116 "ldq $20,32($30)\n\t"
117 "ldq $21,40($30)\n\t"
118 "ldt $f17,8($30)\n\t" /* floating point registers */
119 "ldt $f18,16($30)\n\t"
120 "ldt $f19,24($30)\n\t"
121 "ldt $f20,32($30)\n\t"
122 "ldt $f21,40($30)\n\t"
123
124 "addq $30,48,$30\n\t" /* remove params from stack */
125
126 /*
127 * Call the virtual function with the constructed stack frame.
128 */
129 "bis $16,$16,$1\n\t" /* load "this" */
130 "ldq $2,16($15)\n\t" /* load "methodIndex" */
131 "ldq $1,0($1)\n\t" /* load vtable */
132 "s8addq $2,$31,$2\n\t" /* vtable index = "methodIndex" * 8 */
133 "addq $1,$2,$1\n\t"
134 "ldq $27,0($1)\n\t" /* load address of function */
135 "jsr $26,($27),0\n\t" /* call virtual function */
136 "ldgp $29,0($26)\n\t"
137
138 "bis $15,$15,$30\n\t"
139 "ldq $26,0($30)\n\t"
140 "ldq $15,8($30)\n\t"
141 "addq $30,32,$30\n\t"
142 "ret $31,($26),1\n\t"
143 ".end NS_InvokeByIndex"
144 );
145