| ... | ... | @@ -45,6 +45,12 @@ comptime { |
| 45 | 45 | symbol(&__aeabi_read_tp, "__aeabi_read_tp"); |
| 46 | 46 | } |
| 47 | 47 | |
| 48 | symbol(&__gnu_thumb1_case_sqi, "__gnu_thumb1_case_sqi"); |
| 49 | symbol(&__gnu_thumb1_case_uqi, "__gnu_thumb1_case_uqi"); |
| 50 | symbol(&__gnu_thumb1_case_shi, "__gnu_thumb1_case_shi"); |
| 51 | symbol(&__gnu_thumb1_case_uhi, "__gnu_thumb1_case_uhi"); |
| 52 | symbol(&__gnu_thumb1_case_si, "__gnu_thumb1_case_si"); |
| 53 | |
| 48 | 54 | // floating-point helper functions (single+double-precision reverse subtraction, y – x), see subdf3.zig |
| 49 | 55 | symbol(&__aeabi_frsub, "__aeabi_frsub"); |
| 50 | 56 | symbol(&__aeabi_drsub, "__aeabi_drsub"); |
| ... | ... | @@ -205,6 +211,83 @@ pub fn __aeabi_ldivmod() callconv(.naked) void { |
| 205 | 211 | unreachable; |
| 206 | 212 | } |
| 207 | 213 | |
| 214 | // GCC Thumb1 compressed switch tables: <https://gcc.gnu.org/legacy-ml/gcc-patches/2009-06/msg01698.html> |
| 215 | |
| 216 | pub fn __gnu_thumb1_case_sqi() callconv(.naked) noreturn { |
| 217 | asm volatile ( |
| 218 | \\ push {r1} |
| 219 | \\ mov r1, lr |
| 220 | \\ lsrs r1, r1, #1 |
| 221 | \\ lsls r1, r1, #1 |
| 222 | \\ ldrsb r1, [r1, r0] |
| 223 | \\ lsls r1, r1, #1 |
| 224 | \\ add lr, lr, r1 |
| 225 | \\ pop {r1} |
| 226 | \\ bx lr |
| 227 | ); |
| 228 | } |
| 229 | |
| 230 | pub fn __gnu_thumb1_case_uqi() callconv(.naked) noreturn { |
| 231 | asm volatile ( |
| 232 | \\ push {r1} |
| 233 | \\ mov r1, lr |
| 234 | \\ lsrs r1, r1, #1 |
| 235 | \\ lsls r1, r1, #1 |
| 236 | \\ ldrb r1, [r1, r0] |
| 237 | \\ lsls r1, r1, #1 |
| 238 | \\ add lr, lr, r1 |
| 239 | \\ pop {r1} |
| 240 | \\ bx lr |
| 241 | ); |
| 242 | } |
| 243 | |
| 244 | pub fn __gnu_thumb1_case_shi() callconv(.naked) noreturn { |
| 245 | asm volatile ( |
| 246 | \\ push {r0, r1} |
| 247 | \\ mov r1, lr |
| 248 | \\ lsrs r1, r1, #1 |
| 249 | \\ lsls r0, r0, #1 |
| 250 | \\ lsls r1, r1, #1 |
| 251 | \\ ldrsh r1, [r1, r0] |
| 252 | \\ lsls r1, r1, #1 |
| 253 | \\ add lr, lr, r1 |
| 254 | \\ pop {r0, r1} |
| 255 | \\ bx lr |
| 256 | ); |
| 257 | } |
| 258 | |
| 259 | pub fn __gnu_thumb1_case_uhi() callconv(.naked) noreturn { |
| 260 | asm volatile ( |
| 261 | \\ push {r0, r1} |
| 262 | \\ mov r1, lr |
| 263 | \\ lsrs r1, r1, #1 |
| 264 | \\ lsls r0, r0, #1 |
| 265 | \\ lsls r1, r1, #1 |
| 266 | \\ ldrh r1, [r1, r0] |
| 267 | \\ lsls r1, r1, #1 |
| 268 | \\ add lr, lr, r1 |
| 269 | \\ pop {r0, r1} |
| 270 | \\ bx lr |
| 271 | ); |
| 272 | } |
| 273 | |
| 274 | pub fn __gnu_thumb1_case_si() callconv(.naked) noreturn { |
| 275 | asm volatile ( |
| 276 | \\ push {r0, r1} |
| 277 | \\ mov r1, lr |
| 278 | \\ adds r1, r1, #2 |
| 279 | \\ lsrs r1, r1, #2 |
| 280 | \\ lsls r0, r0, #2 |
| 281 | \\ lsls r1, r1, #2 |
| 282 | \\ ldr r0, [r1, r0] |
| 283 | \\ adds r0, r0, r1 |
| 284 | \\ adds r0, r0, #1 |
| 285 | \\ mov lr, r0 |
| 286 | \\ pop {r0, r1} |
| 287 | \\ bx lr |
| 288 | ); |
| 289 | } |
| 290 | |
| 208 | 291 | // Float Arithmetic |
| 209 | 292 | |
| 210 | 293 | fn __aeabi_frsub(a: f32, b: f32) callconv(.{ .arm_aapcs = .{} }) f32 { |
Quinn X. J. <orichalcumcosmonaut@protonmail.com> 2025-08-11 23:47:23+10:00
Alex Rønne Petersen <alex@alexrp.com> 2026-09-27 11:05:23+02:00