projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| a86a7a39 | 1 | /* Install given context. |
| 04277e02 | 2 | Copyright (C) 2008-2019 Free Software Foundation, Inc. |
| a86a7a39 JJ |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by David S. Miller <davem@davemloft.net>, 2008. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 | 17 | License along with the GNU C Library; if not, see |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| a86a7a39 JJ |
19 | |
| 20 | #include <sysdep.h> | |
| 21 | #include <sys/trap.h> | |
| 22 | ||
| 23 | #include "ucontext_i.h" | |
| 24 | ||
| 25 | ||
| 26 | /* int __setcontext (const ucontext_t *ucp) | |
| 27 | ||
| 28 | Restores the machine context in UCP and thereby resumes execution | |
| 29 | in that context. | |
| 30 | ||
| 31 | This implementation is intended to be used for *synchronous* context | |
| 32 | switches only. Therefore, it does not have to restore anything | |
| 33 | other than the PRESERVED state. */ | |
| 34 | ||
| 35 | ENTRY(__setcontext) | |
| 36 | save %sp, -112, %sp | |
| 37 | ||
| 38 | mov SIG_SETMASK, %o0 | |
| 39 | add %i0, UC_SIGMASK, %o1 | |
| 40 | clr %o2 | |
| 41 | mov 8, %o3 | |
| 42 | mov __NR_rt_sigprocmask, %g1 | |
| 43 | ta 0x10 | |
| 44 | ||
| 45 | /* This is a bit on the expensive side, and we could optimize | |
| 46 | the unwind similar to how the 32-bit sparc longjmp code | |
| 47 | does if performance of this routine really matters. */ | |
| 48 | ta ST_FLUSH_WINDOWS | |
| 49 | ||
| 50 | ldub [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN], %g1 | |
| 51 | cmp %g1, 0 | |
| 52 | be 1f | |
| 53 | nop | |
| 54 | ld [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_FSR], %fsr | |
| 55 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D0], %f0 | |
| 56 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D2], %f2 | |
| 57 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D4], %f4 | |
| 58 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D6], %f6 | |
| 59 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D8], %f8 | |
| 60 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D10], %f10 | |
| 61 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D12], %f12 | |
| 62 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D14], %f14 | |
| 63 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D16], %f16 | |
| 64 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D18], %f18 | |
| 65 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D20], %f20 | |
| 66 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D22], %f22 | |
| 67 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D24], %f24 | |
| 68 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D26], %f26 | |
| 69 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D28], %f28 | |
| 70 | ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D30], %f30 | |
| 71 | 1: | |
| 72 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y], %g1 | |
| 73 | wr %g1, 0x0, %y | |
| 74 | ||
| 75 | /* We specifically do not restore %g1 since we need it here as | |
| 76 | a temporary. */ | |
| 77 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2], %g2 | |
| 78 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3], %g3 | |
| 79 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4], %g4 | |
| 80 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5], %g5 | |
| 81 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6], %g6 | |
| 82 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7], %g7 | |
| 83 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1], %i1 | |
| 84 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2], %i2 | |
| 85 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3], %i3 | |
| 86 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4], %i4 | |
| 87 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5], %i5 | |
| 88 | ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6], %i6 | |
| 89 | restore | |
| 90 | ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O7], %o7 | |
| 91 | ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_PC], %g1 | |
| 92 | jmpl %g1, %g0 | |
| 93 | ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O0], %o0 | |
| 94 | END(__setcontext) | |
| 95 | ||
| 96 | weak_alias (__setcontext, setcontext) | |
| 97 | ||
| 9aa5c222 AJ |
98 | /* We add an NOP here to separate between __setcontext/__startcontext. The |
| 99 | wanted behavior that happens is: when unwinding from a function called | |
| 100 | inside a makecontext() context, FDE lookup will use '&__startcontext - 1', | |
| 101 | then returns NULL for no FDE found, and immediately ends the unwind, in | |
| 102 | a normal fashion. | |
| 103 | ||
| 104 | If this NOP word does not exist, FDE lookup just repeatedly finds | |
| 105 | __setcontext's FDE in an infinite loop, due to the convention of using | |
| 106 | 'address - 1' for FDE lookup. Modifiying/deleting the below | |
| 107 | __startcontext's FDE has no help on this. */ | |
| 108 | ||
| 109 | nop | |
| 110 | ||
| a86a7a39 JJ |
111 | /* This is the helper code which gets called if a function which is |
| 112 | registered with 'makecontext' returns. In this case we have to | |
| 113 | install the context listed in the uc_link element of the context | |
| 114 | 'makecontext' manipulated at the time of the 'makecontext' call. | |
| 115 | If the pointer is NULL the process must terminate. */ | |
| 116 | ||
| 117 | ENTRY(__start_context) | |
| 118 | ld [%sp + (16 * 4)], %g1 | |
| 119 | cmp %g1, 0 | |
| 120 | be,a 1f | |
| 121 | clr %o0 | |
| 122 | call __setcontext | |
| 123 | mov %g1, %o0 | |
| 124 | /* If this returns (which can happen if the syscall fails) we'll | |
| 125 | exit the program with the return error value (-1). */ | |
| 86746abb | 126 | 1: call HIDDEN_JUMPTARGET(exit) |
| a86a7a39 JJ |
127 | nop |
| 128 | /* The 'exit' call should never return. In case it does cause | |
| 129 | the process to terminate. */ | |
| 130 | unimp | |
| 131 | END(__start_context) |