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| 1 | /* Copyright (C) 1998-2024 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _SYS_UCONTEXT_H |
| 19 | #define _SYS_UCONTEXT_H 1 |
| 20 | |
| 21 | #include <features.h> |
| 22 | |
| 23 | #include <bits/types/sigset_t.h> |
| 24 | #include <bits/types/stack_t.h> |
| 25 | |
| 26 | |
| 27 | #ifdef __USE_MISC |
| 28 | # define __ctx(fld) fld |
| 29 | #else |
| 30 | # define __ctx(fld) __ ## fld |
| 31 | #endif |
| 32 | |
| 33 | struct __ctx(pt_regs); |
| 34 | |
| 35 | #if __WORDSIZE == 32 |
| 36 | |
| 37 | /* Number of general registers. */ |
| 38 | # define __NGREG 48 |
| 39 | # ifdef __USE_MISC |
| 40 | # define NGREG __NGREG |
| 41 | # endif |
| 42 | |
| 43 | /* Container for all general registers. */ |
| 44 | typedef unsigned long gregset_t[__NGREG]; |
| 45 | |
| 46 | /* Container for floating-point registers and status */ |
| 47 | typedef struct _libc_fpstate |
| 48 | { |
| 49 | double __ctx(fpregs)[32]; |
| 50 | double __ctx(fpscr); |
| 51 | unsigned int _pad[2]; |
| 52 | } fpregset_t; |
| 53 | |
| 54 | /* Container for Altivec/VMX registers and status. |
| 55 | Needs to be aligned on a 16-byte boundary. */ |
| 56 | typedef struct _libc_vrstate |
| 57 | { |
| 58 | unsigned int __ctx(vrregs)[32][4]; |
| 59 | unsigned int __ctx(vrsave); |
| 60 | unsigned int _pad[2]; |
| 61 | unsigned int __ctx(vscr); |
| 62 | } vrregset_t; |
| 63 | |
| 64 | /* Context to describe whole processor state. */ |
| 65 | typedef struct |
| 66 | { |
| 67 | gregset_t __ctx(gregs); |
| 68 | fpregset_t __ctx(fpregs); |
| 69 | vrregset_t __ctx(vrregs) __attribute__((__aligned__(16))); |
| 70 | } mcontext_t; |
| 71 | |
| 72 | #else |
| 73 | |
| 74 | /* For 64-bit kernels with Altivec support, a machine context is exactly |
| 75 | * a sigcontext. For older kernel (without Altivec) the sigcontext matches |
| 76 | * the mcontext upto but not including the v_regs field. For kernels that |
| 77 | * don't set AT_HWCAP or return AT_HWCAP without PPC_FEATURE_HAS_ALTIVEC the |
| 78 | * v_regs field may not exist and should not be referenced. The v_regs field |
| 79 | * can be referenced safely only after verifying that PPC_FEATURE_HAS_ALTIVEC |
| 80 | * is set in AT_HWCAP. */ |
| 81 | |
| 82 | /* Number of general registers. */ |
| 83 | # define __NGREG 48 /* includes r0-r31, nip, msr, lr, etc. */ |
| 84 | # define __NFPREG 33 /* includes fp0-fp31 &fpscr. */ |
| 85 | # define __NVRREG 34 /* includes v0-v31, vscr, & vrsave in |
| 86 | split vectors */ |
| 87 | # ifdef __USE_MISC |
| 88 | # define NGREG __NGREG |
| 89 | # define NFPREG __NFPREG |
| 90 | # define NVRREG __NVRREG |
| 91 | # endif |
| 92 | |
| 93 | typedef unsigned long gregset_t[__NGREG]; |
| 94 | typedef double fpregset_t[__NFPREG]; |
| 95 | |
| 96 | /* Container for Altivec/VMX Vector Status and Control Register. Only 32-bits |
| 97 | but can only be copied to/from a 128-bit vector register. So we allocated |
| 98 | a whole quadword speedup save/restore. */ |
| 99 | typedef struct _libc_vscr |
| 100 | { |
| 101 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| 102 | unsigned int __pad[3]; |
| 103 | unsigned int __ctx(vscr_word); |
| 104 | #else |
| 105 | unsigned int __ctx(vscr_word); |
| 106 | unsigned int __pad[3]; |
| 107 | #endif |
| 108 | } vscr_t; |
| 109 | |
| 110 | /* Container for Altivec/VMX registers and status. |
| 111 | Must to be aligned on a 16-byte boundary. */ |
| 112 | typedef struct _libc_vrstate |
| 113 | { |
| 114 | unsigned int __ctx(vrregs)[32][4]; |
| 115 | vscr_t __ctx(vscr); |
| 116 | unsigned int __ctx(vrsave); |
| 117 | unsigned int __pad[3]; |
| 118 | } vrregset_t __attribute__((__aligned__(16))); |
| 119 | |
| 120 | typedef struct { |
| 121 | unsigned long __glibc_reserved[4]; |
| 122 | int __ctx(signal); |
| 123 | int __pad0; |
| 124 | unsigned long __ctx(handler); |
| 125 | unsigned long __ctx(oldmask); |
| 126 | struct __ctx(pt_regs) *__ctx(regs); |
| 127 | gregset_t __ctx(gp_regs); |
| 128 | fpregset_t __ctx(fp_regs); |
| 129 | /* |
| 130 | * To maintain compatibility with current implementations the sigcontext is |
| 131 | * extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t) |
| 132 | * followed by an unstructured (vmx_reserve) field of 69 doublewords. This |
| 133 | * allows the array of vector registers to be quadword aligned independent of |
| 134 | * the alignment of the containing sigcontext or ucontext. It is the |
| 135 | * responsibility of the code setting the sigcontext to set this pointer to |
| 136 | * either NULL (if this processor does not support the VMX feature) or the |
| 137 | * address of the first quadword within the allocated (vmx_reserve) area. |
| 138 | * |
| 139 | * The pointer (v_regs) of vector type (elf_vrreg_t) is essentially |
| 140 | * an array of 34 quadword entries. The entries with |
| 141 | * indexes 0-31 contain the corresponding vector registers. The entry with |
| 142 | * index 32 contains the vscr as the last word (offset 12) within the |
| 143 | * quadword. This allows the vscr to be stored as either a quadword (since |
| 144 | * it must be copied via a vector register to/from storage) or as a word. |
| 145 | * The entry with index 33 contains the vrsave as the first word (offset 0) |
| 146 | * within the quadword. |
| 147 | */ |
| 148 | vrregset_t *__ctx(v_regs); |
| 149 | long __ctx(vmx_reserve)[__NVRREG+__NVRREG+1]; |
| 150 | } mcontext_t; |
| 151 | |
| 152 | #endif |
| 153 | |
| 154 | /* Userlevel context. */ |
| 155 | typedef struct ucontext_t |
| 156 | { |
| 157 | unsigned long int __ctx(uc_flags); |
| 158 | struct ucontext_t *uc_link; |
| 159 | stack_t uc_stack; |
| 160 | #if __WORDSIZE == 32 |
| 161 | /* |
| 162 | * These fields are set up this way to maximize source and |
| 163 | * binary compatibility with code written for the old |
| 164 | * ucontext_t definition, which didn't include space for the |
| 165 | * registers. |
| 166 | * |
| 167 | * Different versions of the kernel have stored the registers on |
| 168 | * signal delivery at different offsets from the ucontext struct. |
| 169 | * Programs should thus use the uc_mcontext.uc_regs pointer to |
| 170 | * find where the registers are actually stored. The registers |
| 171 | * will be stored within the ucontext_t struct but not necessarily |
| 172 | * at a fixed address. As a side-effect, this lets us achieve |
| 173 | * 16-byte alignment for the register storage space if the |
| 174 | * Altivec registers are to be saved, without requiring 16-byte |
| 175 | * alignment on the whole ucontext_t. |
| 176 | * |
| 177 | * The uc_mcontext.regs field is included for source compatibility |
| 178 | * with programs written against the older ucontext_t definition, |
| 179 | * and its name should therefore not change. The uc_pad field |
| 180 | * is for binary compatibility with programs compiled against the |
| 181 | * old ucontext_t; it ensures that uc_mcontext.regs and uc_sigmask |
| 182 | * are at the same offset as previously. |
| 183 | */ |
| 184 | int __glibc_reserved1[7]; |
| 185 | union __ctx(uc_regs_ptr) { |
| 186 | struct __ctx(pt_regs) *__ctx(regs); |
| 187 | mcontext_t *__ctx(uc_regs); |
| 188 | } uc_mcontext; |
| 189 | sigset_t uc_sigmask; |
| 190 | /* last for extensibility */ |
| 191 | char __ctx(uc_reg_space)[sizeof (mcontext_t) + 12]; |
| 192 | #else /* 64-bit */ |
| 193 | sigset_t uc_sigmask; |
| 194 | mcontext_t uc_mcontext; /* last for extensibility */ |
| 195 | #endif |
| 196 | } ucontext_t; |
| 197 | |
| 198 | #undef __ctx |
| 199 | |
| 200 | #endif /* sys/ucontext.h */ |
| 201 |
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