summaryrefslogtreecommitdiffstats
path: root/xpcom/reflect/xptcall/md/unix/xptcinvoke_linux_s390.cpp
blob: 573dfb00c2792cb7bd0c83f220b407b8b2d97f7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/* -*- 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"


static uint32_t
invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
{
    uint32_t overflow = 0, gpr = 1 /*this*/, fpr = 0;
    for(uint32_t i = 0; i < paramCount; i++, s++)
    {
        if(s->IsPtrData())
        {
            if (gpr < 5) gpr++; else overflow++;
            continue;
        }
        switch(s->type)
        {
        case nsXPTType::T_I8     :
        case nsXPTType::T_I16    :
        case nsXPTType::T_I32    :
            if (gpr < 5) gpr++; else overflow++;
            break;
        case nsXPTType::T_I64    :
            if (gpr < 4) gpr+=2; else gpr=5, overflow+=2;
            break;
        case nsXPTType::T_U8     :
        case nsXPTType::T_U16    :
        case nsXPTType::T_U32    :
            if (gpr < 5) gpr++; else overflow++;
            break;
        case nsXPTType::T_U64    :
            if (gpr < 4) gpr+=2; else gpr=5, overflow+=2;
            break;
        case nsXPTType::T_FLOAT  :
            if (fpr < 2) fpr++; else overflow++;
            break;
        case nsXPTType::T_DOUBLE :
            if (fpr < 2) fpr++; else overflow+=2;
            break;
        case nsXPTType::T_BOOL   :
        case nsXPTType::T_CHAR   :
        case nsXPTType::T_WCHAR  :
            if (gpr < 5) gpr++; else overflow++;
            break;
        default:
            // all the others are plain pointer types
            if (gpr < 5) gpr++; else overflow++;
            break;
        }
    }
    /* Round up number of overflow words to ensure stack
       stays aligned to 8 bytes.  */
    return (overflow + 1) & ~1;
}

static void
invoke_copy_to_stack(uint32_t paramCount, nsXPTCVariant* s, uint32_t* d_ov, uint32_t overflow)
{
    uint32_t *d_gpr = d_ov + overflow; 
    uint64_t *d_fpr = (uint64_t *)(d_gpr + 4);
    uint32_t gpr = 1 /*this*/, fpr = 0;

    for(uint32_t i = 0; i < paramCount; i++, s++)
    {
        if(s->IsPtrData())
        {
            if (gpr < 5) 
                *((void**)d_gpr) = s->ptr, d_gpr++, gpr++;
            else
                *((void**)d_ov ) = s->ptr, d_ov++;
            continue;
        }
        switch(s->type)
        {
        case nsXPTType::T_I8     : 
            if (gpr < 5)
                *((int32_t*) d_gpr) = s->val.i8, d_gpr++, gpr++;
            else
                *((int32_t*) d_ov ) = s->val.i8, d_ov++;
            break;
        case nsXPTType::T_I16    : 
            if (gpr < 5)
                *((int32_t*) d_gpr) = s->val.i16, d_gpr++, gpr++;
            else
                *((int32_t*) d_ov ) = s->val.i16, d_ov++;
            break;
        case nsXPTType::T_I32    : 
            if (gpr < 5)
                *((int32_t*) d_gpr) = s->val.i32, d_gpr++, gpr++;
            else
                *((int32_t*) d_ov ) = s->val.i32, d_ov++;
            break;
        case nsXPTType::T_I64    : 
            if (gpr < 4)
                *((int64_t*) d_gpr) = s->val.i64, d_gpr+=2, gpr+=2;
            else
                *((int64_t*) d_ov ) = s->val.i64, d_ov+=2, gpr=5;
            break;
        case nsXPTType::T_U8     : 
            if (gpr < 5)
                *((uint32_t*) d_gpr) = s->val.u8, d_gpr++, gpr++;
            else
                *((uint32_t*) d_ov ) = s->val.u8, d_ov++;
            break;
        case nsXPTType::T_U16    : 
            if (gpr < 5)
                *((uint32_t*)d_gpr) = s->val.u16, d_gpr++, gpr++;
            else
                *((uint32_t*)d_ov ) = s->val.u16, d_ov++;
            break;
        case nsXPTType::T_U32    : 
            if (gpr < 5)
                *((uint32_t*)d_gpr) = s->val.u32, d_gpr++, gpr++;
            else
                *((uint32_t*)d_ov ) = s->val.u32, d_ov++;
            break;
        case nsXPTType::T_U64    : 
            if (gpr < 4)
                *((uint64_t*)d_gpr) = s->val.u64, d_gpr+=2, gpr+=2;
            else
                *((uint64_t*)d_ov ) = s->val.u64, d_ov+=2, gpr=5;
            break;
        case nsXPTType::T_FLOAT  : 
            if (fpr < 2)
                *((float*)   d_fpr) = s->val.f, d_fpr++, fpr++;
            else
                *((float*)   d_ov ) = s->val.f, d_ov++;
            break;
        case nsXPTType::T_DOUBLE : 
            if (fpr < 2)
                *((double*)  d_fpr) = s->val.d, d_fpr++, fpr++;
            else
                *((double*)  d_ov ) = s->val.d, d_ov+=2;
            break;
        case nsXPTType::T_BOOL   : 
            if (gpr < 5)
                *((uint32_t*)d_gpr) = s->val.b, d_gpr++, gpr++;
            else
                *((uint32_t*)d_ov ) = s->val.b, d_ov++;
            break;
        case nsXPTType::T_CHAR   : 
            if (gpr < 5)
                *((uint32_t*)d_gpr) = s->val.c, d_gpr++, gpr++;
            else
                *((uint32_t*)d_ov ) = s->val.c, d_ov++;
            break;
        case nsXPTType::T_WCHAR  : 
            if (gpr < 5)
                *((uint32_t*)d_gpr) = s->val.wc, d_gpr++, gpr++;
            else
                *((uint32_t*)d_ov ) = s->val.wc, d_ov++;
            break;
        default:
            // all the others are plain pointer types
            if (gpr < 5) 
                *((void**)   d_gpr) = s->val.p, d_gpr++, gpr++;
            else
                *((void**)   d_ov ) = s->val.p, d_ov++;
            break;
        }
    }
}

typedef nsresult (*vtable_func)(nsISupports *, uint32_t, uint32_t, uint32_t, uint32_t, double, double);

// Avoid AddressSanitizer instrumentation for the next function because it
// depends on __builtin_alloca behavior and alignment that cannot be relied on
// once the function is compiled with a version of ASan that has dynamic-alloca
// instrumentation enabled.

MOZ_ASAN_BLACKLIST
EXPORT_XPCOM_API(nsresult)
NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
                 uint32_t paramCount, nsXPTCVariant* params)
{
    vtable_func *vtable = *reinterpret_cast<vtable_func **>(that);
    vtable_func method = vtable[methodIndex];
    uint32_t overflow = invoke_count_words (paramCount, params);
    uint32_t *stack_space = reinterpret_cast<uint32_t *>(__builtin_alloca((overflow + 8 /* 4 32-bits gpr + 2 64-bits fpr */) * 4));

    invoke_copy_to_stack(paramCount, params, stack_space, overflow);

    uint32_t *d_gpr = stack_space + overflow;
    double *d_fpr = reinterpret_cast<double *>(d_gpr + 4);

    return method(that, d_gpr[0], d_gpr[1], d_gpr[2], d_gpr[3],  d_fpr[0], d_fpr[1]);
}