internal/fakecgo: simplify ppc64le trampolines (#424)
Drop NOFRAME and manual LR/CR save/restore from the x_cgo_* trampolines, letting the Go assembler manage their frames. These are called from Go and don't need ELFv2 linkage area management. Simplify setg_trampoline by dropping NOFRAME, using a Go-managed $16 frame with FP-relative argument access, and saving R31 directly to the stack instead of shuttling through a non-volatile register. In threadentry_trampoline, save and restore all C callee-saved registers (R14-R31, F14-F31) using the SAVE_GPR/SAVE_FPR macros from abi_ppc64x.h. This function is the entry point for threads created by pthread_create, so it must preserve the C caller's non-volatile registers across the call into Go code. Without this, Go can clobber these registers and corrupt the C runtime's state when the thread exits.
- commit
- 23e4f41d5c257ba46bcbeda5980dd43c02d4b311
- author
- George Adams · · 2026-02-26 18:02 UTC
- committer
- GitHub · · 2026-02-26 18:02 UTC
- parent
- 7618415
- signature
- GPG Unverified
B5690EEEBB952194The key is unknown
1 file · +30 -129
M internal/fakecgo/trampolines_ppc64le.s +30 -129
| @@ -5,188 +5,89 @@ | |||
| 5 | 5 | ||
| 6 | 6 | #include "textflag.h" | |
| 7 | 7 | #include "go_asm.h" | |
| 8 | + | #include "abi_ppc64x.h" | |
| 8 | 9 | ||
| 9 | 10 | // These trampolines map the C ABI to Go ABI and call into the Go equivalent functions. | |
| 10 | - | // | |
| 11 | - | // PPC64LE ELFv2 ABI stack frame layout: | |
| 12 | - | // 0(R1) = backchain (pointer to caller's frame) | |
| 13 | - | // 8(R1) = CR save area | |
| 14 | - | // 16(R1) = LR save area | |
| 15 | - | // 24(R1) = reserved | |
| 16 | - | // 32(R1) = parameter save area (minimum 64 bytes for 8 args) | |
| 17 | - | // | |
| 18 | - | // Two patterns are used depending on call direction: | |
| 19 | - | // | |
| 20 | - | // C→Go trampolines: The C caller already provides a 32-byte linkage area. | |
| 21 | - | // Save LR/CR into caller's frame at 16(R1)/8(R1) BEFORE allocating, | |
| 22 | - | // then use MOVDU to allocate and set backchain atomically. | |
| 23 | - | // | |
| 24 | - | // Go→C trampolines: Go callers don't provide ELFv2 linkage area. | |
| 25 | - | // Allocate frame first with MOVDU, then save LR/CR into OUR frame. | |
| 26 | - | ||
| 27 | - | TEXT x_cgo_init_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 28 | - | MOVD LR, 16(R1) | |
| 29 | - | MOVW CR, R0 | |
| 30 | - | MOVD R0, 8(R1) | |
| 31 | 11 | ||
| 32 | - | MOVDU R1, -32(R1) | |
| 33 | - | ||
| 34 | - | // R3, R4 already have the arguments | |
| 12 | + | TEXT x_cgo_init_trampoline(SB), NOSPLIT, $0-0 | |
| 35 | 13 | MOVD ·x_cgo_init_call(SB), R12 | |
| 36 | 14 | MOVD (R12), R12 | |
| 37 | 15 | MOVD R12, CTR | |
| 38 | 16 | CALL CTR | |
| 39 | - | ||
| 40 | - | ADD $32, R1 | |
| 41 | - | ||
| 42 | - | MOVD 16(R1), LR | |
| 43 | - | MOVD 8(R1), R0 | |
| 44 | - | MOVW R0, CR | |
| 45 | 17 | RET | |
| 46 | 18 | ||
| 47 | - | TEXT x_cgo_thread_start_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 48 | - | MOVD LR, 16(R1) | |
| 49 | - | MOVW CR, R0 | |
| 50 | - | MOVD R0, 8(R1) | |
| 51 | - | ||
| 52 | - | MOVDU R1, -32(R1) | |
| 53 | - | ||
| 19 | + | TEXT x_cgo_thread_start_trampoline(SB), NOSPLIT, $0-0 | |
| 54 | 20 | MOVD ·x_cgo_thread_start_call(SB), R12 | |
| 55 | 21 | MOVD (R12), R12 | |
| 56 | 22 | MOVD R12, CTR | |
| 57 | 23 | CALL CTR | |
| 58 | - | ||
| 59 | - | ADD $32, R1 | |
| 60 | - | ||
| 61 | - | MOVD 16(R1), LR | |
| 62 | - | MOVD 8(R1), R0 | |
| 63 | - | MOVW R0, CR | |
| 64 | 24 | RET | |
| 65 | 25 | ||
| 66 | - | // void (*_cgo_setenv)(char**) | |
| 67 | - | // C arg: R3 = pointer to env | |
| 68 | - | // This is C→Go: caller is C ABI. | |
| 69 | - | TEXT x_cgo_setenv_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 70 | - | MOVD LR, 16(R1) | |
| 71 | - | MOVW CR, R0 | |
| 72 | - | MOVD R0, 8(R1) | |
| 73 | - | ||
| 74 | - | MOVDU R1, -32(R1) | |
| 75 | - | ||
| 26 | + | TEXT x_cgo_setenv_trampoline(SB), NOSPLIT, $0-0 | |
| 76 | 27 | MOVD ·x_cgo_setenv_call(SB), R12 | |
| 77 | 28 | MOVD (R12), R12 | |
| 78 | 29 | MOVD R12, CTR | |
| 79 | 30 | CALL CTR | |
| 80 | - | ||
| 81 | - | ADD $32, R1 | |
| 82 | - | ||
| 83 | - | MOVD 16(R1), LR | |
| 84 | - | MOVD 8(R1), R0 | |
| 85 | - | MOVW R0, CR | |
| 86 | 31 | RET | |
| 87 | 32 | ||
| 88 | - | TEXT x_cgo_unsetenv_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 89 | - | MOVD LR, 16(R1) | |
| 90 | - | MOVW CR, R0 | |
| 91 | - | MOVD R0, 8(R1) | |
| 92 | - | ||
| 93 | - | MOVDU R1, -32(R1) | |
| 94 | - | ||
| 33 | + | TEXT x_cgo_unsetenv_trampoline(SB), NOSPLIT, $0-0 | |
| 95 | 34 | MOVD ·x_cgo_unsetenv_call(SB), R12 | |
| 96 | 35 | MOVD (R12), R12 | |
| 97 | 36 | MOVD R12, CTR | |
| 98 | 37 | CALL CTR | |
| 99 | - | ||
| 100 | - | ADD $32, R1 | |
| 101 | - | ||
| 102 | - | MOVD 16(R1), LR | |
| 103 | - | MOVD 8(R1), R0 | |
| 104 | - | MOVW R0, CR | |
| 105 | 38 | RET | |
| 106 | 39 | ||
| 107 | - | TEXT x_cgo_notify_runtime_init_done_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 108 | - | MOVD LR, 16(R1) | |
| 109 | - | MOVW CR, R0 | |
| 110 | - | MOVD R0, 8(R1) | |
| 111 | - | ||
| 112 | - | MOVDU R1, -32(R1) | |
| 113 | - | ||
| 40 | + | TEXT x_cgo_notify_runtime_init_done_trampoline(SB), NOSPLIT, $0-0 | |
| 114 | 41 | CALL ·x_cgo_notify_runtime_init_done(SB) | |
| 115 | - | ||
| 116 | - | ADD $32, R1 | |
| 117 | - | ||
| 118 | - | MOVD 16(R1), LR | |
| 119 | - | MOVD 8(R1), R0 | |
| 120 | - | MOVW R0, CR | |
| 121 | 42 | RET | |
| 122 | 43 | ||
| 123 | - | TEXT x_cgo_bindm_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 124 | - | MOVD LR, 16(R1) | |
| 125 | - | MOVW CR, R0 | |
| 126 | - | MOVD R0, 8(R1) | |
| 127 | - | ||
| 128 | - | MOVDU R1, -32(R1) | |
| 129 | - | ||
| 44 | + | TEXT x_cgo_bindm_trampoline(SB), NOSPLIT, $0-0 | |
| 130 | 45 | CALL ·x_cgo_bindm(SB) | |
| 131 | - | ||
| 132 | - | ADD $32, R1 | |
| 133 | - | ||
| 134 | - | MOVD 16(R1), LR | |
| 135 | - | MOVD 8(R1), R0 | |
| 136 | - | MOVW R0, CR | |
| 137 | 46 | RET | |
| 138 | 47 | ||
| 139 | - | TEXT ·setg_trampoline(SB), NOSPLIT|NOFRAME, $0-16 | |
| 140 | - | // Save LR, CR, and R31 to non-volatile registers (C ABI preserves R14-R31) | |
| 141 | - | MOVD LR, R20 | |
| 142 | - | MOVW CR, R21 | |
| 143 | - | MOVD R31, R22 // save R31 because load_g clobbers it | |
| 144 | - | ||
| 145 | - | // Load arguments from Go stack | |
| 146 | - | MOVD 32(R1), R12 // setg function pointer | |
| 147 | - | MOVD 40(R1), R3 // g pointer → first C arg | |
| 48 | + | // func setg_trampoline(setg uintptr, g uintptr) | |
| 49 | + | TEXT ·setg_trampoline(SB), NOSPLIT, $16-16 | |
| 50 | + | MOVD R31, 8(R1) // save R31 (load_g clobbers it) | |
| 148 | 51 | ||
| 149 | - | // Allocate ELFv2 frame for the C callee (32 bytes minimum) | |
| 150 | - | MOVDU R1, -32(R1) | |
| 52 | + | MOVD setg+0(FP), R12 | |
| 53 | + | MOVD newg+8(FP), R3 | |
| 151 | 54 | ||
| 152 | - | // Call setg_gcc which stores g to TLS | |
| 153 | 55 | MOVD R12, CTR | |
| 154 | 56 | CALL CTR | |
| 155 | 57 | ||
| 156 | - | // setg_gcc stored g to TLS but restored old g in R30. | |
| 157 | - | // Call load_g to reload g from TLS into R30. | |
| 158 | - | // Note: load_g clobbers R31 | |
| 159 | 58 | CALL runtime·load_g(SB) | |
| 160 | 59 | ||
| 161 | - | // Deallocate frame | |
| 162 | - | ADD $32, R1 | |
| 163 | - | ||
| 164 | - | // Clear R0 before returning to Go code. | |
| 165 | - | // Go uses R0 as a constant 0 for things like "std r0,X(r1)" to zero stack locations. | |
| 166 | - | // C/assembly functions may leave garbage in R0. | |
| 167 | - | XOR R0, R0, R0 | |
| 168 | - | ||
| 169 | - | // Restore LR, CR, and R31 from non-volatile registers | |
| 170 | - | MOVD R22, R31 // restore R31 | |
| 171 | - | MOVD R20, LR | |
| 172 | - | MOVW R21, CR | |
| 60 | + | MOVD 8(R1), R31 | |
| 61 | + | XOR R0, R0, R0 | |
| 173 | 62 | RET | |
| 174 | 63 | ||
| 175 | 64 | TEXT threadentry_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |
| 176 | - | MOVD LR, 16(R1) | |
| 65 | + | // Called from C (pthread_create). Must save all C callee-saved registers. | |
| 66 | + | // Uses NOFRAME for proper ELFv2 backchain via MOVDU. | |
| 67 | + | MOVD LR, R0 | |
| 68 | + | MOVD R0, 16(R1) | |
| 177 | 69 | MOVW CR, R0 | |
| 178 | 70 | MOVD R0, 8(R1) | |
| 179 | 71 | ||
| 180 | - | MOVDU R1, -32(R1) | |
| 72 | + | MOVDU R1, -320(R1) | |
| 73 | + | ||
| 74 | + | SAVE_GPR(32) | |
| 75 | + | SAVE_FPR(32+SAVE_GPR_SIZE) | |
| 76 | + | ||
| 77 | + | MOVD $0, R0 | |
| 181 | 78 | ||
| 182 | 79 | MOVD ·threadentry_call(SB), R12 | |
| 183 | 80 | MOVD (R12), R12 | |
| 184 | 81 | MOVD R12, CTR | |
| 185 | 82 | CALL CTR | |
| 186 | 83 | ||
| 187 | - | ADD $32, R1 | |
| 84 | + | RESTORE_FPR(32+SAVE_GPR_SIZE) | |
| 85 | + | RESTORE_GPR(32) | |
| 86 | + | ||
| 87 | + | ADD $320, R1 | |
| 188 | 88 | ||
| 189 | - | MOVD 16(R1), LR | |
| 89 | + | MOVD 16(R1), R0 | |
| 90 | + | MOVD R0, LR | |
| 190 | 91 | MOVD 8(R1), R0 | |
| 191 | 92 | MOVW R0, CR | |
| 192 | 93 | RET | |
| @@ -5,188 +5,89 @@ | |||||
| 5 | 5 | ||||
| 6 | #include "textflag.h" | 6 | #include "textflag.h" | ||
| 7 | #include "go_asm.h" | 7 | #include "go_asm.h" | ||
| 8 | + | #include "abi_ppc64x.h" | |||
| 8 | 9 | ||||
| 9 | // These trampolines map the C ABI to Go ABI and call into the Go equivalent functions. | 10 | // These trampolines map the C ABI to Go ABI and call into the Go equivalent functions. | ||
| 10 | - | // | |||
| 11 | - | // PPC64LE ELFv2 ABI stack frame layout: | |||
| 12 | - | // 0(R1) = backchain (pointer to caller's frame) | |||
| 13 | - | // 8(R1) = CR save area | |||
| 14 | - | // 16(R1) = LR save area | |||
| 15 | - | // 24(R1) = reserved | |||
| 16 | - | // 32(R1) = parameter save area (minimum 64 bytes for 8 args) | |||
| 17 | - | // | |||
| 18 | - | // Two patterns are used depending on call direction: | |||
| 19 | - | // | |||
| 20 | - | // C→Go trampolines: The C caller already provides a 32-byte linkage area. | |||
| 21 | - | // Save LR/CR into caller's frame at 16(R1)/8(R1) BEFORE allocating, | |||
| 22 | - | // then use MOVDU to allocate and set backchain atomically. | |||
| 23 | - | // | |||
| 24 | - | // Go→C trampolines: Go callers don't provide ELFv2 linkage area. | |||
| 25 | - | // Allocate frame first with MOVDU, then save LR/CR into OUR frame. | |||
| 26 | - | ||||
| 27 | - | TEXT x_cgo_init_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |||
| 28 | - | MOVD LR, 16(R1) | |||
| 29 | - | MOVW CR, R0 | |||
| 30 | - | MOVD R0, 8(R1) | |||
| 31 | 11 | ||||
| 32 | - | MOVDU R1, -32(R1) | 12 | + | TEXT x_cgo_init_trampoline(SB), NOSPLIT, $0-0 |
| 33 | - | ||||
| 34 | - | // R3, R4 already have the arguments | |||
| 35 | MOVD ·x_cgo_init_call(SB), R12 | 13 | MOVD ·x_cgo_init_call(SB), R12 | ||
| 36 | MOVD (R12), R12 | 14 | MOVD (R12), R12 | ||
| 37 | MOVD R12, CTR | 15 | MOVD R12, CTR | ||
| 38 | CALL CTR | 16 | CALL CTR | ||
| 39 | - | ||||
| 40 | - | ADD $32, R1 | |||
| 41 | - | ||||
| 42 | - | MOVD 16(R1), LR | |||
| 43 | - | MOVD 8(R1), R0 | |||
| 44 | - | MOVW R0, CR | |||
| 45 | RET | 17 | RET | ||
| 46 | 18 | ||||
| 47 | - | TEXT x_cgo_thread_start_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | 19 | + | TEXT x_cgo_thread_start_trampoline(SB), NOSPLIT, $0-0 |
| 48 | - | MOVD LR, 16(R1) | |||
| 49 | - | MOVW CR, R0 | |||
| 50 | - | MOVD R0, 8(R1) | |||
| 51 | - | ||||
| 52 | - | MOVDU R1, -32(R1) | |||
| 53 | - | ||||
| 54 | MOVD ·x_cgo_thread_start_call(SB), R12 | 20 | MOVD ·x_cgo_thread_start_call(SB), R12 | ||
| 55 | MOVD (R12), R12 | 21 | MOVD (R12), R12 | ||
| 56 | MOVD R12, CTR | 22 | MOVD R12, CTR | ||
| 57 | CALL CTR | 23 | CALL CTR | ||
| 58 | - | ||||
| 59 | - | ADD $32, R1 | |||
| 60 | - | ||||
| 61 | - | MOVD 16(R1), LR | |||
| 62 | - | MOVD 8(R1), R0 | |||
| 63 | - | MOVW R0, CR | |||
| 64 | RET | 24 | RET | ||
| 65 | 25 | ||||
| 66 | - | // void (*_cgo_setenv)(char**) | 26 | + | TEXT x_cgo_setenv_trampoline(SB), NOSPLIT, $0-0 |
| 67 | - | // C arg: R3 = pointer to env | |||
| 68 | - | // This is C→Go: caller is C ABI. | |||
| 69 | - | TEXT x_cgo_setenv_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | |||
| 70 | - | MOVD LR, 16(R1) | |||
| 71 | - | MOVW CR, R0 | |||
| 72 | - | MOVD R0, 8(R1) | |||
| 73 | - | ||||
| 74 | - | MOVDU R1, -32(R1) | |||
| 75 | - | ||||
| 76 | MOVD ·x_cgo_setenv_call(SB), R12 | 27 | MOVD ·x_cgo_setenv_call(SB), R12 | ||
| 77 | MOVD (R12), R12 | 28 | MOVD (R12), R12 | ||
| 78 | MOVD R12, CTR | 29 | MOVD R12, CTR | ||
| 79 | CALL CTR | 30 | CALL CTR | ||
| 80 | - | ||||
| 81 | - | ADD $32, R1 | |||
| 82 | - | ||||
| 83 | - | MOVD 16(R1), LR | |||
| 84 | - | MOVD 8(R1), R0 | |||
| 85 | - | MOVW R0, CR | |||
| 86 | RET | 31 | RET | ||
| 87 | 32 | ||||
| 88 | - | TEXT x_cgo_unsetenv_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | 33 | + | TEXT x_cgo_unsetenv_trampoline(SB), NOSPLIT, $0-0 |
| 89 | - | MOVD LR, 16(R1) | |||
| 90 | - | MOVW CR, R0 | |||
| 91 | - | MOVD R0, 8(R1) | |||
| 92 | - | ||||
| 93 | - | MOVDU R1, -32(R1) | |||
| 94 | - | ||||
| 95 | MOVD ·x_cgo_unsetenv_call(SB), R12 | 34 | MOVD ·x_cgo_unsetenv_call(SB), R12 | ||
| 96 | MOVD (R12), R12 | 35 | MOVD (R12), R12 | ||
| 97 | MOVD R12, CTR | 36 | MOVD R12, CTR | ||
| 98 | CALL CTR | 37 | CALL CTR | ||
| 99 | - | ||||
| 100 | - | ADD $32, R1 | |||
| 101 | - | ||||
| 102 | - | MOVD 16(R1), LR | |||
| 103 | - | MOVD 8(R1), R0 | |||
| 104 | - | MOVW R0, CR | |||
| 105 | RET | 38 | RET | ||
| 106 | 39 | ||||
| 107 | - | TEXT x_cgo_notify_runtime_init_done_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | 40 | + | TEXT x_cgo_notify_runtime_init_done_trampoline(SB), NOSPLIT, $0-0 |
| 108 | - | MOVD LR, 16(R1) | |||
| 109 | - | MOVW CR, R0 | |||
| 110 | - | MOVD R0, 8(R1) | |||
| 111 | - | ||||
| 112 | - | MOVDU R1, -32(R1) | |||
| 113 | - | ||||
| 114 | CALL ·x_cgo_notify_runtime_init_done(SB) | 41 | CALL ·x_cgo_notify_runtime_init_done(SB) | ||
| 115 | - | ||||
| 116 | - | ADD $32, R1 | |||
| 117 | - | ||||
| 118 | - | MOVD 16(R1), LR | |||
| 119 | - | MOVD 8(R1), R0 | |||
| 120 | - | MOVW R0, CR | |||
| 121 | RET | 42 | RET | ||
| 122 | 43 | ||||
| 123 | - | TEXT x_cgo_bindm_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | 44 | + | TEXT x_cgo_bindm_trampoline(SB), NOSPLIT, $0-0 |
| 124 | - | MOVD LR, 16(R1) | |||
| 125 | - | MOVW CR, R0 | |||
| 126 | - | MOVD R0, 8(R1) | |||
| 127 | - | ||||
| 128 | - | MOVDU R1, -32(R1) | |||
| 129 | - | ||||
| 130 | CALL ·x_cgo_bindm(SB) | 45 | CALL ·x_cgo_bindm(SB) | ||
| 131 | - | ||||
| 132 | - | ADD $32, R1 | |||
| 133 | - | ||||
| 134 | - | MOVD 16(R1), LR | |||
| 135 | - | MOVD 8(R1), R0 | |||
| 136 | - | MOVW R0, CR | |||
| 137 | RET | 46 | RET | ||
| 138 | 47 | ||||
| 139 | - | TEXT ·setg_trampoline(SB), NOSPLIT|NOFRAME, $0-16 | 48 | + | // func setg_trampoline(setg uintptr, g uintptr) |
| 140 | - | // Save LR, CR, and R31 to non-volatile registers (C ABI preserves R14-R31) | 49 | + | TEXT ·setg_trampoline(SB), NOSPLIT, $16-16 |
| 141 | - | MOVD LR, R20 | 50 | + | MOVD R31, 8(R1) // save R31 (load_g clobbers it) |
| 142 | - | MOVW CR, R21 | |||
| 143 | - | MOVD R31, R22 // save R31 because load_g clobbers it | |||
| 144 | - | ||||
| 145 | - | // Load arguments from Go stack | |||
| 146 | - | MOVD 32(R1), R12 // setg function pointer | |||
| 147 | - | MOVD 40(R1), R3 // g pointer → first C arg | |||
| 148 | 51 | ||||
| 149 | - | // Allocate ELFv2 frame for the C callee (32 bytes minimum) | 52 | + | MOVD setg+0(FP), R12 |
| 150 | - | MOVDU R1, -32(R1) | 53 | + | MOVD newg+8(FP), R3 |
| 151 | 54 | ||||
| 152 | - | // Call setg_gcc which stores g to TLS | |||
| 153 | MOVD R12, CTR | 55 | MOVD R12, CTR | ||
| 154 | CALL CTR | 56 | CALL CTR | ||
| 155 | 57 | ||||
| 156 | - | // setg_gcc stored g to TLS but restored old g in R30. | |||
| 157 | - | // Call load_g to reload g from TLS into R30. | |||
| 158 | - | // Note: load_g clobbers R31 | |||
| 159 | CALL runtime·load_g(SB) | 58 | CALL runtime·load_g(SB) | ||
| 160 | 59 | ||||
| 161 | - | // Deallocate frame | 60 | + | MOVD 8(R1), R31 |
| 162 | - | ADD $32, R1 | 61 | + | XOR R0, R0, R0 |
| 163 | - | ||||
| 164 | - | // Clear R0 before returning to Go code. | |||
| 165 | - | // Go uses R0 as a constant 0 for things like "std r0,X(r1)" to zero stack locations. | |||
| 166 | - | // C/assembly functions may leave garbage in R0. | |||
| 167 | - | XOR R0, R0, R0 | |||
| 168 | - | ||||
| 169 | - | // Restore LR, CR, and R31 from non-volatile registers | |||
| 170 | - | MOVD R22, R31 // restore R31 | |||
| 171 | - | MOVD R20, LR | |||
| 172 | - | MOVW R21, CR | |||
| 173 | RET | 62 | RET | ||
| 174 | 63 | ||||
| 175 | TEXT threadentry_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | 64 | TEXT threadentry_trampoline(SB), NOSPLIT|NOFRAME, $0-0 | ||
| 176 | - | MOVD LR, 16(R1) | 65 | + | // Called from C (pthread_create). Must save all C callee-saved registers. |
| 66 | + | // Uses NOFRAME for proper ELFv2 backchain via MOVDU. | |||
| 67 | + | MOVD LR, R0 | |||
| 68 | + | MOVD R0, 16(R1) | |||
| 177 | MOVW CR, R0 | 69 | MOVW CR, R0 | ||
| 178 | MOVD R0, 8(R1) | 70 | MOVD R0, 8(R1) | ||
| 179 | 71 | ||||
| 180 | - | MOVDU R1, -32(R1) | 72 | + | MOVDU R1, -320(R1) |
| 73 | + | ||||
| 74 | + | SAVE_GPR(32) | |||
| 75 | + | SAVE_FPR(32+SAVE_GPR_SIZE) | |||
| 76 | + | ||||
| 77 | + | MOVD $0, R0 | |||
| 181 | 78 | ||||
| 182 | MOVD ·threadentry_call(SB), R12 | 79 | MOVD ·threadentry_call(SB), R12 | ||
| 183 | MOVD (R12), R12 | 80 | MOVD (R12), R12 | ||
| 184 | MOVD R12, CTR | 81 | MOVD R12, CTR | ||
| 185 | CALL CTR | 82 | CALL CTR | ||
| 186 | 83 | ||||
| 187 | - | ADD $32, R1 | 84 | + | RESTORE_FPR(32+SAVE_GPR_SIZE) |
| 85 | + | RESTORE_GPR(32) | |||
| 86 | + | ||||
| 87 | + | ADD $320, R1 | |||
| 188 | 88 | ||||
| 189 | - | MOVD 16(R1), LR | 89 | + | MOVD 16(R1), R0 |
| 90 | + | MOVD R0, LR | |||
| 190 | MOVD 8(R1), R0 | 91 | MOVD 8(R1), R0 | ||
| 191 | MOVW R0, CR | 92 | MOVW R0, CR | ||
| 192 | RET | 93 | RET | ||