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Add compiler-rt fallbacks for sync builtins on armv5te-musl.
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‎src/arm_linux.rs

+73-37
Original file line numberDiff line numberDiff line change
@@ -55,7 +55,7 @@ fn insert_aligned(aligned: u32, val: u32, shift: u32, mask: u32) -> u32 {
5555
}
5656

5757
// Generic atomic read-modify-write operation
58-
unsafe fn atomic_rmw<T, F: Fn(u32) -> u32>(ptr: *mut T, f: F) -> u32 {
58+
unsafe fn atomic_rmw<T, F: Fn(u32) -> u32, G: Fn(u32, u32) -> u32>(ptr: *mut T, f: F, g: G) -> u32 {
5959
let aligned_ptr = align_ptr(ptr);
6060
let (shift, mask) = get_shift_mask(ptr);
6161

@@ -65,7 +65,7 @@ unsafe fn atomic_rmw<T, F: Fn(u32) -> u32>(ptr: *mut T, f: F) -> u32 {
6565
let newval = f(curval);
6666
let newval_aligned = insert_aligned(curval_aligned, newval, shift, mask);
6767
if __kuser_cmpxchg(curval_aligned, newval_aligned, aligned_ptr) {
68-
return curval;
68+
return g(curval, newval);
6969
}
7070
}
7171
}
@@ -89,13 +89,21 @@ unsafe fn atomic_cmpxchg<T>(ptr: *mut T, oldval: u32, newval: u32) -> u32 {
8989
}
9090

9191
macro_rules! atomic_rmw {
92-
($name:ident, $ty:ty, $op:expr) => {
92+
($name:ident, $ty:ty, $op:expr, $fetch:expr) => {
9393
intrinsics! {
9494
pub unsafe extern "C" fn $name(ptr: *mut $ty, val: $ty) -> $ty {
95-
atomic_rmw(ptr, |x| $op(x as $ty, val) as u32) as $ty
95+
atomic_rmw(ptr, |x| $op(x as $ty, val) as u32, |old, new| $fetch(old, new)) as $ty
9696
}
9797
}
9898
};
99+
100+
(@old $name:ident, $ty:ty, $op:expr) => {
101+
atomic_rmw!($name, $ty, $op, |old, _| old);
102+
};
103+
104+
(@new $name:ident, $ty:ty, $op:expr) => {
105+
atomic_rmw!($name, $ty, $op, |_, new| new);
106+
};
99107
}
100108
macro_rules! atomic_cmpxchg {
101109
($name:ident, $ty:ty) => {
@@ -107,101 +115,129 @@ macro_rules! atomic_cmpxchg {
107115
};
108116
}
109117

110-
atomic_rmw!(__sync_fetch_and_add_1, u8, |a: u8, b: u8| a.wrapping_add(b));
111-
atomic_rmw!(__sync_fetch_and_add_2, u16, |a: u16, b: u16| a
118+
atomic_rmw!(@old __sync_fetch_and_add_1, u8, |a: u8, b: u8| a.wrapping_add(b));
119+
atomic_rmw!(@old __sync_fetch_and_add_2, u16, |a: u16, b: u16| a
120+
.wrapping_add(b));
121+
atomic_rmw!(@old __sync_fetch_and_add_4, u32, |a: u32, b: u32| a
122+
.wrapping_add(b));
123+
124+
atomic_rmw!(@new __sync_add_and_fetch_1, u8, |a: u8, b: u8| a.wrapping_add(b));
125+
atomic_rmw!(@new __sync_add_and_fetch_2, u16, |a: u16, b: u16| a
112126
.wrapping_add(b));
113-
atomic_rmw!(__sync_fetch_and_add_4, u32, |a: u32, b: u32| a
127+
atomic_rmw!(@new __sync_add_and_fetch_4, u32, |a: u32, b: u32| a
114128
.wrapping_add(b));
115129

116-
atomic_rmw!(__sync_fetch_and_sub_1, u8, |a: u8, b: u8| a.wrapping_sub(b));
117-
atomic_rmw!(__sync_fetch_and_sub_2, u16, |a: u16, b: u16| a
130+
atomic_rmw!(@old __sync_fetch_and_sub_1, u8, |a: u8, b: u8| a.wrapping_sub(b));
131+
atomic_rmw!(@old __sync_fetch_and_sub_2, u16, |a: u16, b: u16| a
118132
.wrapping_sub(b));
119-
atomic_rmw!(__sync_fetch_and_sub_4, u32, |a: u32, b: u32| a
133+
atomic_rmw!(@old __sync_fetch_and_sub_4, u32, |a: u32, b: u32| a
120134
.wrapping_sub(b));
121135

122-
atomic_rmw!(__sync_fetch_and_and_1, u8, |a: u8, b: u8| a & b);
123-
atomic_rmw!(__sync_fetch_and_and_2, u16, |a: u16, b: u16| a & b);
124-
atomic_rmw!(__sync_fetch_and_and_4, u32, |a: u32, b: u32| a & b);
136+
atomic_rmw!(@new __sync_sub_and_fetch_1, u8, |a: u8, b: u8| a.wrapping_sub(b));
137+
atomic_rmw!(@new __sync_sub_and_fetch_2, u16, |a: u16, b: u16| a
138+
.wrapping_sub(b));
139+
atomic_rmw!(@new __sync_sub_and_fetch_4, u32, |a: u32, b: u32| a
140+
.wrapping_sub(b));
141+
142+
atomic_rmw!(@old __sync_fetch_and_and_1, u8, |a: u8, b: u8| a & b);
143+
atomic_rmw!(@old __sync_fetch_and_and_2, u16, |a: u16, b: u16| a & b);
144+
atomic_rmw!(@old __sync_fetch_and_and_4, u32, |a: u32, b: u32| a & b);
145+
146+
atomic_rmw!(@new __sync_and_and_fetch_1, u8, |a: u8, b: u8| a & b);
147+
atomic_rmw!(@new __sync_and_and_fetch_2, u16, |a: u16, b: u16| a & b);
148+
atomic_rmw!(@new __sync_and_and_fetch_4, u32, |a: u32, b: u32| a & b);
149+
150+
atomic_rmw!(@old __sync_fetch_and_or_1, u8, |a: u8, b: u8| a | b);
151+
atomic_rmw!(@old __sync_fetch_and_or_2, u16, |a: u16, b: u16| a | b);
152+
atomic_rmw!(@old __sync_fetch_and_or_4, u32, |a: u32, b: u32| a | b);
153+
154+
atomic_rmw!(@new __sync_or_and_fetch_1, u8, |a: u8, b: u8| a | b);
155+
atomic_rmw!(@new __sync_or_and_fetch_2, u16, |a: u16, b: u16| a | b);
156+
atomic_rmw!(@new __sync_or_and_fetch_4, u32, |a: u32, b: u32| a | b);
157+
158+
atomic_rmw!(@old __sync_fetch_and_xor_1, u8, |a: u8, b: u8| a ^ b);
159+
atomic_rmw!(@old __sync_fetch_and_xor_2, u16, |a: u16, b: u16| a ^ b);
160+
atomic_rmw!(@old __sync_fetch_and_xor_4, u32, |a: u32, b: u32| a ^ b);
125161

126-
atomic_rmw!(__sync_fetch_and_or_1, u8, |a: u8, b: u8| a | b);
127-
atomic_rmw!(__sync_fetch_and_or_2, u16, |a: u16, b: u16| a | b);
128-
atomic_rmw!(__sync_fetch_and_or_4, u32, |a: u32, b: u32| a | b);
162+
atomic_rmw!(@new __sync_xor_and_fetch_1, u8, |a: u8, b: u8| a ^ b);
163+
atomic_rmw!(@new __sync_xor_and_fetch_2, u16, |a: u16, b: u16| a ^ b);
164+
atomic_rmw!(@new __sync_xor_and_fetch_4, u32, |a: u32, b: u32| a ^ b);
129165

130-
atomic_rmw!(__sync_fetch_and_xor_1, u8, |a: u8, b: u8| a ^ b);
131-
atomic_rmw!(__sync_fetch_and_xor_2, u16, |a: u16, b: u16| a ^ b);
132-
atomic_rmw!(__sync_fetch_and_xor_4, u32, |a: u32, b: u32| a ^ b);
166+
atomic_rmw!(@old __sync_fetch_and_nand_1, u8, |a: u8, b: u8| !(a & b));
167+
atomic_rmw!(@old __sync_fetch_and_nand_2, u16, |a: u16, b: u16| !(a & b));
168+
atomic_rmw!(@old __sync_fetch_and_nand_4, u32, |a: u32, b: u32| !(a & b));
133169

134-
atomic_rmw!(__sync_fetch_and_nand_1, u8, |a: u8, b: u8| !(a & b));
135-
atomic_rmw!(__sync_fetch_and_nand_2, u16, |a: u16, b: u16| !(a & b));
136-
atomic_rmw!(__sync_fetch_and_nand_4, u32, |a: u32, b: u32| !(a & b));
170+
atomic_rmw!(@new __sync_nand_and_fetch_1, u8, |a: u8, b: u8| !(a & b));
171+
atomic_rmw!(@new __sync_nand_and_fetch_2, u16, |a: u16, b: u16| !(a & b));
172+
atomic_rmw!(@new __sync_nand_and_fetch_4, u32, |a: u32, b: u32| !(a & b));
137173

138-
atomic_rmw!(__sync_fetch_and_max_1, i8, |a: i8, b: i8| if a > b {
174+
atomic_rmw!(@old __sync_fetch_and_max_1, i8, |a: i8, b: i8| if a > b {
139175
a
140176
} else {
141177
b
142178
});
143-
atomic_rmw!(__sync_fetch_and_max_2, i16, |a: i16, b: i16| if a > b {
179+
atomic_rmw!(@old __sync_fetch_and_max_2, i16, |a: i16, b: i16| if a > b {
144180
a
145181
} else {
146182
b
147183
});
148-
atomic_rmw!(__sync_fetch_and_max_4, i32, |a: i32, b: i32| if a > b {
184+
atomic_rmw!(@old __sync_fetch_and_max_4, i32, |a: i32, b: i32| if a > b {
149185
a
150186
} else {
151187
b
152188
});
153189

154-
atomic_rmw!(__sync_fetch_and_umax_1, u8, |a: u8, b: u8| if a > b {
190+
atomic_rmw!(@old __sync_fetch_and_umax_1, u8, |a: u8, b: u8| if a > b {
155191
a
156192
} else {
157193
b
158194
});
159-
atomic_rmw!(__sync_fetch_and_umax_2, u16, |a: u16, b: u16| if a > b {
195+
atomic_rmw!(@old __sync_fetch_and_umax_2, u16, |a: u16, b: u16| if a > b {
160196
a
161197
} else {
162198
b
163199
});
164-
atomic_rmw!(__sync_fetch_and_umax_4, u32, |a: u32, b: u32| if a > b {
200+
atomic_rmw!(@old __sync_fetch_and_umax_4, u32, |a: u32, b: u32| if a > b {
165201
a
166202
} else {
167203
b
168204
});
169205

170-
atomic_rmw!(__sync_fetch_and_min_1, i8, |a: i8, b: i8| if a < b {
206+
atomic_rmw!(@old __sync_fetch_and_min_1, i8, |a: i8, b: i8| if a < b {
171207
a
172208
} else {
173209
b
174210
});
175-
atomic_rmw!(__sync_fetch_and_min_2, i16, |a: i16, b: i16| if a < b {
211+
atomic_rmw!(@old __sync_fetch_and_min_2, i16, |a: i16, b: i16| if a < b {
176212
a
177213
} else {
178214
b
179215
});
180-
atomic_rmw!(__sync_fetch_and_min_4, i32, |a: i32, b: i32| if a < b {
216+
atomic_rmw!(@old __sync_fetch_and_min_4, i32, |a: i32, b: i32| if a < b {
181217
a
182218
} else {
183219
b
184220
});
185221

186-
atomic_rmw!(__sync_fetch_and_umin_1, u8, |a: u8, b: u8| if a < b {
222+
atomic_rmw!(@old __sync_fetch_and_umin_1, u8, |a: u8, b: u8| if a < b {
187223
a
188224
} else {
189225
b
190226
});
191-
atomic_rmw!(__sync_fetch_and_umin_2, u16, |a: u16, b: u16| if a < b {
227+
atomic_rmw!(@old __sync_fetch_and_umin_2, u16, |a: u16, b: u16| if a < b {
192228
a
193229
} else {
194230
b
195231
});
196-
atomic_rmw!(__sync_fetch_and_umin_4, u32, |a: u32, b: u32| if a < b {
232+
atomic_rmw!(@old __sync_fetch_and_umin_4, u32, |a: u32, b: u32| if a < b {
197233
a
198234
} else {
199235
b
200236
});
201237

202-
atomic_rmw!(__sync_lock_test_and_set_1, u8, |_: u8, b: u8| b);
203-
atomic_rmw!(__sync_lock_test_and_set_2, u16, |_: u16, b: u16| b);
204-
atomic_rmw!(__sync_lock_test_and_set_4, u32, |_: u32, b: u32| b);
238+
atomic_rmw!(@old __sync_lock_test_and_set_1, u8, |_: u8, b: u8| b);
239+
atomic_rmw!(@old __sync_lock_test_and_set_2, u16, |_: u16, b: u16| b);
240+
atomic_rmw!(@old __sync_lock_test_and_set_4, u32, |_: u32, b: u32| b);
205241

206242
atomic_cmpxchg!(__sync_val_compare_and_swap_1, u8);
207243
atomic_cmpxchg!(__sync_val_compare_and_swap_2, u16);

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