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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 | /* * Linux/PARISC Project (http://www.parisc-linux.org/) * * HP-UX System Call Wrapper routines and System Call Return Path * * Copyright (C) 2000 Hewlett-Packard (John Marvin) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifdef CONFIG_64BIT #warning PA64 support needs more work...did first cut #endif #include <asm/asm-offsets.h> #include <asm/assembly.h> #include <asm/signal.h> #include <linux/linkage.h> .level LEVEL .text /* These should probably go in a header file somewhere. * They are duplicated in kernel/wrappers.S * Possibly we should consider consolidating these * register save/restore macros. */ .macro reg_save regs #ifdef CONFIG_64BIT #warning NEEDS WORK for 64-bit #endif STREG %r3, PT_GR3(\regs) STREG %r4, PT_GR4(\regs) STREG %r5, PT_GR5(\regs) STREG %r6, PT_GR6(\regs) STREG %r7, PT_GR7(\regs) STREG %r8, PT_GR8(\regs) STREG %r9, PT_GR9(\regs) STREG %r10,PT_GR10(\regs) STREG %r11,PT_GR11(\regs) STREG %r12,PT_GR12(\regs) STREG %r13,PT_GR13(\regs) STREG %r14,PT_GR14(\regs) STREG %r15,PT_GR15(\regs) STREG %r16,PT_GR16(\regs) STREG %r17,PT_GR17(\regs) STREG %r18,PT_GR18(\regs) .endm .macro reg_restore regs LDREG PT_GR3(\regs), %r3 LDREG PT_GR4(\regs), %r4 LDREG PT_GR5(\regs), %r5 LDREG PT_GR6(\regs), %r6 LDREG PT_GR7(\regs), %r7 LDREG PT_GR8(\regs), %r8 LDREG PT_GR9(\regs), %r9 LDREG PT_GR10(\regs),%r10 LDREG PT_GR11(\regs),%r11 LDREG PT_GR12(\regs),%r12 LDREG PT_GR13(\regs),%r13 LDREG PT_GR14(\regs),%r14 LDREG PT_GR15(\regs),%r15 LDREG PT_GR16(\regs),%r16 LDREG PT_GR17(\regs),%r17 LDREG PT_GR18(\regs),%r18 .endm .import sys_fork ENTRY(hpux_fork_wrapper) ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs ;! pointer in task reg_save %r1 STREG %r2,-20(%r30) ldo 64(%r30),%r30 STREG %r2,PT_GR19(%r1) ;! save for child STREG %r30,PT_GR21(%r1) ;! save for child LDREG PT_GR30(%r1),%r25 mtctl %r25,%cr29 copy %r1,%r24 bl sys_clone,%r2 ldi SIGCHLD,%r26 LDREG -84(%r30),%r2 fork_return: ldo -64(%r30),%r30 ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs reg_restore %r1 /* * HP-UX wants pid (child gets parent pid, parent gets child pid) * in r28 and a flag in r29 (r29 == 1 for child, 0 for parent). * Linux fork returns 0 for child, pid for parent. Since HP-UX * libc stub throws away parent pid and returns 0 for child, * we'll just return 0 for parent pid now. Only applications * that jump directly to the gateway page (not supported) will * know the difference. We can fix this later if necessary. */ ldo -1024(%r0),%r1 comb,>>=,n %r28,%r1,fork_exit /* just let the syscall exit handle it */ or,= %r28,%r0,%r0 or,tr %r0,%r0,%r29 /* r28 <> 0, we are parent, set r29 to 0 */ ldo 1(%r0),%r29 /* r28 == 0, we are child, set r29 to 1 */ fork_exit: bv %r0(%r2) nop ENDPROC(hpux_fork_wrapper) /* Set the return value for the child */ ENTRY(hpux_child_return) #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) bl,n schedule_tail, %r2 #endif LDREG TASK_PT_GR19-TASK_SZ_ALGN-128(%r30),%r2 b fork_return copy %r0,%r28 ENDPROC(hpux_child_return) .import hpux_execve ENTRY(hpux_execv_wrapper) copy %r0,%r24 /* NULL environment */ ENTRY(hpux_execve_wrapper) ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs /* * Do we need to save/restore r3-r18 here? * I don't think so. why would new thread need old * threads registers? */ /* Store arg0, arg1 and arg2 so that hpux_execve will find them */ STREG %r26,PT_GR26(%r1) STREG %r25,PT_GR25(%r1) STREG %r24,PT_GR24(%r1) STREG %r2,-20(%r30) ldo 64(%r30),%r30 bl hpux_execve,%r2 copy %r1,%arg0 ldo -64(%r30),%r30 LDREG -20(%r30),%r2 /* If exec succeeded we need to load the args */ ldo -1024(%r0),%r1 comb,>>= %r28,%r1,exec_error copy %r2,%r19 ldo -TASK_SZ_ALGN-64(%r30),%r1 ;! get task ptr LDREG TASK_PT_GR26(%r1),%r26 LDREG TASK_PT_GR25(%r1),%r25 LDREG TASK_PT_GR24(%r1),%r24 LDREG TASK_PT_GR23(%r1),%r23 copy %r0,%r2 /* Flag to syscall_exit not to clear args */ exec_error: bv %r0(%r19) nop ENDPROC(hpux_execv_wrapper) .import hpux_pipe /* HP-UX expects pipefd's returned in r28 & r29 */ ENTRY(hpux_pipe_wrapper) STREG %r2,-20(%r30) ldo 64(%r30),%r30 bl hpux_pipe,%r2 ldo -56(%r30),%r26 /* pass local array to hpux_pipe */ ldo -1024(%r0),%r1 comb,>>= %r28,%r1,pipe_exit /* let syscall exit handle it */ LDREG -84(%r30),%r2 /* if success, load fd's from stack array */ LDREG -56(%r30),%r28 LDREG -52(%r30),%r29 pipe_exit: bv %r0(%r2) ldo -64(%r30),%r30 ENDPROC(hpux_pipe_wrapper) .import syscall_exit ENTRY(hpux_syscall_exit) /* * * HP-UX call return conventions: * * if error: * r22 = 1 * r28 = errno value * r29 = secondary return value * else * r22 = 0 * r28 = return value * r29 = secondary return value * * For now, we'll just check to see if r28 is < (unsigned long)-1024 * (to handle addresses > 2 Gb) and if so set r22 to zero. If not, * we'll complement r28 and set r22 to 1. Wrappers will be * needed for syscalls that care about the secondary return value. * The wrapper may also need a way of avoiding the following code, * but we'll deal with that when it becomes necessary. */ ldo -1024(%r0),%r1 comb,<< %r28,%r1,no_error copy %r0,%r22 subi 0,%r28,%r28 ldo 1(%r0),%r22 no_error: b,n syscall_exit ENDPROC(hpux_syscall_exit) .import hpux_unimplemented ENTRY(hpux_unimplemented_wrapper) b hpux_unimplemented STREG %r22,-64(%r30) /* overwrite arg8 with syscall number */ ENDPROC(hpux_unimplemented_wrapper) |