^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * arch/sparc64/kernel/signal.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/context_tracking.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/fpumacro.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/uctx.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/siginfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/visasm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include "sigutil.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include "systbls.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include "kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include "entry.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /* {set, get}context() needed for 64-bit SparcLinux userland. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) asmlinkage void sparc64_set_context(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct ucontext __user *ucp = (struct ucontext __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) regs->u_regs[UREG_I0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) enum ctx_state prev_state = exception_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) mc_gregset_t __user *grp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) unsigned long pc, npc, tstate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned long fp, i7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) unsigned char fenab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (get_thread_wsaved() ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) (!__access_ok(ucp, sizeof(*ucp))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) grp = &ucp->uc_mcontext.mc_gregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) err = __get_user(pc, &((*grp)[MC_PC]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) err |= __get_user(npc, &((*grp)[MC_NPC]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (err || ((pc | npc) & 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (regs->u_regs[UREG_I1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (_NSIG_WORDS == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (test_thread_flag(TIF_32BIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) pc &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) npc &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) regs->tpc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) regs->tnpc = npc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) err |= __get_user(regs->y, &((*grp)[MC_Y]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* Skip %g7 as that's the thread register in userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) err |= __put_user(fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) err |= __put_user(i7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (fenab) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned long *fpregs = current_thread_info()->fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) unsigned long fprs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) fprs_write(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (fprs & FPRS_DL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) err |= copy_from_user(fpregs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (fprs & FPRS_DU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) err |= copy_from_user(fpregs+16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) err |= __get_user(current_thread_info()->xfsr[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) err |= __get_user(current_thread_info()->gsr[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) regs->tstate &= ~TSTATE_PEF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) exception_exit(prev_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) do_sigsegv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) asmlinkage void sparc64_get_context(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct ucontext __user *ucp = (struct ucontext __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) regs->u_regs[UREG_I0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) enum ctx_state prev_state = exception_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) mc_gregset_t __user *grp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mcontext_t __user *mcp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) unsigned long fp, i7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) unsigned char fenab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #if 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mcp = &ucp->uc_mcontext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) grp = &mcp->mc_gregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* Skip over the trap instruction, first. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (test_thread_flag(TIF_32BIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) regs->tpc = (regs->tnpc & 0xffffffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) regs->tpc = regs->tnpc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) regs->tnpc += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (_NSIG_WORDS == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) err |= __put_user(current->blocked.sig[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) (unsigned long __user *)&ucp->uc_sigmask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) sizeof(sigset_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) err |= __put_user(regs->y, &((*grp)[MC_Y]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) err |= __get_user(fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) err |= __get_user(i7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) err |= __put_user(fp, &(mcp->mc_fp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) err |= __put_user(i7, &(mcp->mc_i7));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (fenab) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) unsigned long *fpregs = current_thread_info()->fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) unsigned long fprs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) fprs = current_thread_info()->fpsaved[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (fprs & FPRS_DL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (fprs & FPRS_DU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) err |= copy_to_user(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) goto do_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) exception_exit(prev_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) do_sigsegv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* Checks if the fp is valid. We always build rt signal frames which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * are 16-byte aligned, therefore we can always enforce that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * restore frame has that property as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static bool invalid_frame_pointer(void __user *fp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (((unsigned long) fp) & 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct rt_signal_frame {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct sparc_stackf ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) siginfo_t info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct pt_regs regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) __siginfo_fpu_t __user *fpu_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) stack_t stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) sigset_t mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) __siginfo_rwin_t *rwin_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) void do_rt_sigreturn(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) unsigned long tpc, tnpc, tstate, ufp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct rt_signal_frame __user *sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) __siginfo_fpu_t __user *fpu_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) __siginfo_rwin_t __user *rwin_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) synchronize_user_stack ();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) sf = (struct rt_signal_frame __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) (regs->u_regs [UREG_FP] + STACK_BIAS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /* 1. Make sure we are not getting garbage from the user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (invalid_frame_pointer(sf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if ((ufp + STACK_BIAS) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) err = __get_user(tpc, &sf->regs.tpc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) err |= __get_user(tnpc, &sf->regs.tnpc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (test_thread_flag(TIF_32BIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) tpc &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) tnpc &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) err |= ((tpc | tnpc) & 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* 2. Restore the state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) err |= __get_user(regs->y, &sf->regs.y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) err |= __get_user(tstate, &sf->regs.tstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /* User can only change condition codes and %asi in %tstate. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) err |= __get_user(fpu_save, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (!err && fpu_save)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) err |= restore_fpu_state(regs, fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) err |= restore_altstack(&sf->stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) err |= __get_user(rwin_save, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!err && rwin_save) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) if (restore_rwin_state(rwin_save))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) regs->tpc = tpc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) regs->tnpc = tnpc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /* Prevent syscall restart. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) segv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * If we are on the alternate signal stack and would overflow it, don't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * Return an always-bogus address instead so we will die with SIGSEGV.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return (void __user *) -1L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) /* This is the X/Open sanctioned signal stack switching. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) sp = sigsp(sp, ksig) - framesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /* Always align the stack frame. This handles two cases. First,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * sigaltstack need not be mindful of platform specific stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * alignment. Second, if we took this signal because the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * is not aligned properly, we'd like to take the signal cleanly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * and report that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) sp &= ~15UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return (void __user *) sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct rt_signal_frame __user *sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) int wsaved, err, sf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) void __user *tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /* 1. Make sure everything is clean */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) save_and_clear_fpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) wsaved = get_thread_wsaved();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) sf_size = sizeof(struct rt_signal_frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (current_thread_info()->fpsaved[0] & FPRS_FEF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) sf_size += sizeof(__siginfo_fpu_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (wsaved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) sf_size += sizeof(__siginfo_rwin_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) sf = (struct rt_signal_frame __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) get_sigframe(ksig, regs, sf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) if (invalid_frame_pointer (sf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (show_unhandled_signals)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) current->comm, current->pid, (unsigned long)sf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) regs->tpc, regs->u_regs[UREG_I7]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) force_sigsegv(ksig->sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) tail = (sf + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /* 2. Save the current process state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) err = copy_to_user(&sf->regs, regs, sizeof (*regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) __siginfo_fpu_t __user *fpu_save = tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) tail += sizeof(__siginfo_fpu_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) err |= save_fpu_state(regs, fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) err |= __put_user((u64)fpu_save, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) err |= __put_user(0, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (wsaved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) __siginfo_rwin_t __user *rwin_save = tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) tail += sizeof(__siginfo_rwin_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) err |= save_rwin_state(wsaved, rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) err |= __put_user((u64)rwin_save, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) set_thread_wsaved(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) err |= __put_user(0, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) /* Setup sigaltstack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (!wsaved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) err |= copy_in_user((u64 __user *)sf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) (u64 __user *)(regs->u_regs[UREG_FP] +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) STACK_BIAS),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) sizeof(struct reg_window));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) struct reg_window *rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) rp = ¤t_thread_info()->reg_window[wsaved - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) err |= copy_to_user(sf, rp, sizeof(struct reg_window));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (ksig->ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) err |= copy_siginfo_to_user(&sf->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) err |= __put_user(ksig->sig, &sf->info.si_signo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) err |= __put_user(SI_NOINFO, &sf->info.si_code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /* 3. signal handler back-trampoline and parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) regs->u_regs[UREG_I0] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) /* The sigcontext is passed in this way because of how it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * is defined in GLIBC's /usr/include/bits/sigcontext.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * for sparc64. It includes the 128 bytes of siginfo_t.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) /* 5. signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) regs->tnpc = (regs->tpc + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) if (test_thread_flag(TIF_32BIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) regs->tpc &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) regs->tnpc &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) /* 4. return to kernel instructions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct sigaction *sa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) switch (regs->u_regs[UREG_I0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) no_system_call_restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) regs->u_regs[UREG_I0] = EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (!(sa->sa_flags & SA_RESTART))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) goto no_system_call_restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) regs->u_regs[UREG_I0] = orig_i0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) regs->tpc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) regs->tnpc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) /* Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) int restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) bool has_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) /* It's a lot of work and synchronization to add a new ptrace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * register for GDB to save and restore in order to get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * orig_i0 correct for syscall restarts when debugging.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * Although it should be the case that most of the global
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * registers are volatile across a system call, glibc already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * depends upon that fact that we preserve them. So we can't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) * just use any global register to save away the orig_i0 value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * In particular %g2, %g3, %g4, and %g5 are all assumed to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * preserved across a system call trap by various pieces of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * code in glibc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) * %g7 is used as the "thread register". %g6 is not used in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * any fixed manner. %g6 is used as a scratch register and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * a compiler temporary, but it's value is never used across
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * a system call. Therefore %g6 is usable for orig_i0 storage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (pt_regs_is_syscall(regs) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) regs->u_regs[UREG_G6] = orig_i0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (test_thread_flag(TIF_32BIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) do_signal32(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) has_handler = get_signal(&ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) restart_syscall = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (pt_regs_is_syscall(regs) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) restart_syscall = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) orig_i0 = regs->u_regs[UREG_G6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (has_handler) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (restart_syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) syscall_restart(orig_i0, regs, &ksig.ka.sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (restart_syscall) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) switch (regs->u_regs[UREG_I0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) /* replay the system call when we are done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) regs->u_regs[UREG_I0] = orig_i0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) regs->tpc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) regs->tnpc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) regs->u_regs[UREG_G1] = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) regs->tpc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) regs->tnpc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) user_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (thread_info_flags & _TIF_UPROBE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) uprobe_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (thread_info_flags & _TIF_SIGPENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) do_signal(regs, orig_i0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (thread_info_flags & _TIF_NOTIFY_RESUME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) user_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags