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csky: Process management and Signal
This patch adds files related to task_switch, sigcontext, signal, fpu context switch. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Guo Ren
parent
013de2d667
commit
e9564df753
275
arch/csky/abiv2/fpu.c
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275
arch/csky/abiv2/fpu.c
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@ -0,0 +1,275 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/ptrace.h>
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#include <linux/uaccess.h>
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#include <abi/reg_ops.h>
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#define MTCR_MASK 0xFC00FFE0
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#define MFCR_MASK 0xFC00FFE0
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#define MTCR_DIST 0xC0006420
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#define MFCR_DIST 0xC0006020
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void __init init_fpu(void)
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{
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mtcr("cr<1, 2>", 0);
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}
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/*
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* fpu_libc_helper() is to help libc to excute:
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* - mfcr %a, cr<1, 2>
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* - mfcr %a, cr<2, 2>
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* - mtcr %a, cr<1, 2>
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* - mtcr %a, cr<2, 2>
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*/
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int fpu_libc_helper(struct pt_regs *regs)
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{
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int fault;
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unsigned long instrptr, regx = 0;
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unsigned long index = 0, tmp = 0;
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unsigned long tinstr = 0;
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u16 instr_hi, instr_low;
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instrptr = instruction_pointer(regs);
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if (instrptr & 1)
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return 0;
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fault = __get_user(instr_low, (u16 *)instrptr);
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if (fault)
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return 0;
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fault = __get_user(instr_hi, (u16 *)(instrptr + 2));
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if (fault)
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return 0;
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tinstr = instr_hi | ((unsigned long)instr_low << 16);
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if (((tinstr >> 21) & 0x1F) != 2)
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return 0;
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if ((tinstr & MTCR_MASK) == MTCR_DIST) {
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index = (tinstr >> 16) & 0x1F;
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if (index > 13)
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return 0;
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tmp = tinstr & 0x1F;
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if (tmp > 2)
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return 0;
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regx = *(®s->a0 + index);
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if (tmp == 1)
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mtcr("cr<1, 2>", regx);
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else if (tmp == 2)
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mtcr("cr<2, 2>", regx);
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else
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return 0;
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regs->pc += 4;
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return 1;
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}
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if ((tinstr & MFCR_MASK) == MFCR_DIST) {
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index = tinstr & 0x1F;
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if (index > 13)
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return 0;
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tmp = ((tinstr >> 16) & 0x1F);
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if (tmp > 2)
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return 0;
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if (tmp == 1)
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regx = mfcr("cr<1, 2>");
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else if (tmp == 2)
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regx = mfcr("cr<2, 2>");
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else
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return 0;
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*(®s->a0 + index) = regx;
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regs->pc += 4;
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return 1;
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}
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return 0;
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}
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void fpu_fpe(struct pt_regs *regs)
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{
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int sig, code;
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unsigned int fesr;
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fesr = mfcr("cr<2, 2>");
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sig = SIGFPE;
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code = FPE_FLTUNK;
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if (fesr & FPE_ILLE) {
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sig = SIGILL;
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code = ILL_ILLOPC;
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} else if (fesr & FPE_IDC) {
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sig = SIGILL;
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code = ILL_ILLOPN;
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} else if (fesr & FPE_FEC) {
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sig = SIGFPE;
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if (fesr & FPE_IOC)
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code = FPE_FLTINV;
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else if (fesr & FPE_DZC)
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code = FPE_FLTDIV;
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else if (fesr & FPE_UFC)
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code = FPE_FLTUND;
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else if (fesr & FPE_OFC)
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code = FPE_FLTOVF;
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else if (fesr & FPE_IXC)
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code = FPE_FLTRES;
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}
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force_sig_fault(sig, code, (void __user *)regs->pc, current);
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}
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#define FMFVR_FPU_REGS(vrx, vry) \
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"fmfvrl %0, "#vrx"\n" \
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"fmfvrh %1, "#vrx"\n" \
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"fmfvrl %2, "#vry"\n" \
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"fmfvrh %3, "#vry"\n"
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#define FMTVR_FPU_REGS(vrx, vry) \
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"fmtvrl "#vrx", %0\n" \
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"fmtvrh "#vrx", %1\n" \
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"fmtvrl "#vry", %2\n" \
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"fmtvrh "#vry", %3\n"
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#define STW_FPU_REGS(a, b, c, d) \
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"stw %0, (%4, "#a")\n" \
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"stw %1, (%4, "#b")\n" \
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"stw %2, (%4, "#c")\n" \
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"stw %3, (%4, "#d")\n"
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#define LDW_FPU_REGS(a, b, c, d) \
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"ldw %0, (%4, "#a")\n" \
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"ldw %1, (%4, "#b")\n" \
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"ldw %2, (%4, "#c")\n" \
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"ldw %3, (%4, "#d")\n"
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void save_to_user_fp(struct user_fp *user_fp)
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{
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unsigned long flg;
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unsigned long tmp1, tmp2;
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unsigned long *fpregs;
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local_irq_save(flg);
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tmp1 = mfcr("cr<1, 2>");
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tmp2 = mfcr("cr<2, 2>");
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user_fp->fcr = tmp1;
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user_fp->fesr = tmp2;
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fpregs = &user_fp->vr[0];
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#ifdef CONFIG_CPU_HAS_FPUV2
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#ifdef CONFIG_CPU_HAS_VDSP
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asm volatile(
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"vstmu.32 vr0-vr3, (%0)\n"
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"vstmu.32 vr4-vr7, (%0)\n"
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"vstmu.32 vr8-vr11, (%0)\n"
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"vstmu.32 vr12-vr15, (%0)\n"
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"fstmu.64 vr16-vr31, (%0)\n"
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: "+a"(fpregs)
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::"memory");
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#else
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asm volatile(
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"fstmu.64 vr0-vr31, (%0)\n"
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: "+a"(fpregs)
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::"memory");
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#endif
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#else
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{
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unsigned long tmp3, tmp4;
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asm volatile(
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FMFVR_FPU_REGS(vr0, vr1)
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STW_FPU_REGS(0, 4, 16, 20)
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FMFVR_FPU_REGS(vr2, vr3)
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STW_FPU_REGS(32, 36, 48, 52)
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FMFVR_FPU_REGS(vr4, vr5)
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STW_FPU_REGS(64, 68, 80, 84)
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FMFVR_FPU_REGS(vr6, vr7)
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STW_FPU_REGS(96, 100, 112, 116)
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"addi %4, 128\n"
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FMFVR_FPU_REGS(vr8, vr9)
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STW_FPU_REGS(0, 4, 16, 20)
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FMFVR_FPU_REGS(vr10, vr11)
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STW_FPU_REGS(32, 36, 48, 52)
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FMFVR_FPU_REGS(vr12, vr13)
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STW_FPU_REGS(64, 68, 80, 84)
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FMFVR_FPU_REGS(vr14, vr15)
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STW_FPU_REGS(96, 100, 112, 116)
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: "=a"(tmp1), "=a"(tmp2), "=a"(tmp3),
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"=a"(tmp4), "+a"(fpregs)
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::"memory");
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}
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#endif
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local_irq_restore(flg);
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}
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void restore_from_user_fp(struct user_fp *user_fp)
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{
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unsigned long flg;
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unsigned long tmp1, tmp2;
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unsigned long *fpregs;
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local_irq_save(flg);
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tmp1 = user_fp->fcr;
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tmp2 = user_fp->fesr;
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mtcr("cr<1, 2>", tmp1);
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mtcr("cr<2, 2>", tmp2);
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fpregs = &user_fp->vr[0];
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#ifdef CONFIG_CPU_HAS_FPUV2
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#ifdef CONFIG_CPU_HAS_VDSP
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asm volatile(
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"vldmu.32 vr0-vr3, (%0)\n"
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"vldmu.32 vr4-vr7, (%0)\n"
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"vldmu.32 vr8-vr11, (%0)\n"
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"vldmu.32 vr12-vr15, (%0)\n"
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"fldmu.64 vr16-vr31, (%0)\n"
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: "+a"(fpregs)
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::"memory");
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#else
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asm volatile(
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"fldmu.64 vr0-vr31, (%0)\n"
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: "+a"(fpregs)
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::"memory");
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#endif
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#else
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{
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unsigned long tmp3, tmp4;
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asm volatile(
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LDW_FPU_REGS(0, 4, 16, 20)
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FMTVR_FPU_REGS(vr0, vr1)
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LDW_FPU_REGS(32, 36, 48, 52)
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FMTVR_FPU_REGS(vr2, vr3)
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LDW_FPU_REGS(64, 68, 80, 84)
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FMTVR_FPU_REGS(vr4, vr5)
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LDW_FPU_REGS(96, 100, 112, 116)
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FMTVR_FPU_REGS(vr6, vr7)
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"addi %4, 128\n"
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LDW_FPU_REGS(0, 4, 16, 20)
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FMTVR_FPU_REGS(vr8, vr9)
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LDW_FPU_REGS(32, 36, 48, 52)
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FMTVR_FPU_REGS(vr10, vr11)
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LDW_FPU_REGS(64, 68, 80, 84)
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FMTVR_FPU_REGS(vr12, vr13)
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LDW_FPU_REGS(96, 100, 112, 116)
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FMTVR_FPU_REGS(vr14, vr15)
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: "=a"(tmp1), "=a"(tmp2), "=a"(tmp3),
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"=a"(tmp4), "+a"(fpregs)
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::"memory");
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}
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#endif
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local_irq_restore(flg);
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}
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66
arch/csky/abiv2/inc/abi/fpu.h
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66
arch/csky/abiv2/inc/abi/fpu.h
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@ -0,0 +1,66 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_FPU_H
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#define __ASM_CSKY_FPU_H
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#include <asm/sigcontext.h>
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#include <asm/ptrace.h>
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int fpu_libc_helper(struct pt_regs *regs);
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void fpu_fpe(struct pt_regs *regs);
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void __init init_fpu(void);
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void save_to_user_fp(struct user_fp *user_fp);
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void restore_from_user_fp(struct user_fp *user_fp);
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/*
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* Define the fesr bit for fpe handle.
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*/
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#define FPE_ILLE (1 << 16) /* Illegal instruction */
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#define FPE_FEC (1 << 7) /* Input float-point arithmetic exception */
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#define FPE_IDC (1 << 5) /* Input denormalized exception */
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#define FPE_IXC (1 << 4) /* Inexact exception */
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#define FPE_UFC (1 << 3) /* Underflow exception */
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#define FPE_OFC (1 << 2) /* Overflow exception */
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#define FPE_DZC (1 << 1) /* Divide by zero exception */
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#define FPE_IOC (1 << 0) /* Invalid operation exception */
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#define FPE_REGULAR_EXCEPTION (FPE_IXC | FPE_UFC | FPE_OFC | FPE_DZC | FPE_IOC)
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#ifdef CONFIG_OPEN_FPU_IDE
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#define IDE_STAT (1 << 5)
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#else
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#define IDE_STAT 0
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#endif
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#ifdef CONFIG_OPEN_FPU_IXE
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#define IXE_STAT (1 << 4)
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#else
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#define IXE_STAT 0
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#endif
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#ifdef CONFIG_OPEN_FPU_UFE
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#define UFE_STAT (1 << 3)
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#else
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#define UFE_STAT 0
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#endif
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#ifdef CONFIG_OPEN_FPU_OFE
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#define OFE_STAT (1 << 2)
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#else
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#define OFE_STAT 0
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#endif
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#ifdef CONFIG_OPEN_FPU_DZE
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#define DZE_STAT (1 << 1)
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#else
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#define DZE_STAT 0
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#endif
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#ifdef CONFIG_OPEN_FPU_IOE
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#define IOE_STAT (1 << 0)
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#else
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#define IOE_STAT 0
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#endif
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#endif /* __ASM_CSKY_FPU_H */
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150
arch/csky/include/asm/mmu_context.h
Normal file
150
arch/csky/include/asm/mmu_context.h
Normal file
@ -0,0 +1,150 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_MMU_CONTEXT_H
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#define __ASM_CSKY_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <abi/ckmmu.h>
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static inline void tlbmiss_handler_setup_pgd(unsigned long pgd, bool kernel)
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{
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pgd &= ~(1<<31);
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pgd += PHYS_OFFSET;
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pgd |= 1;
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setup_pgd(pgd, kernel);
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}
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#define TLBMISS_HANDLER_SETUP_PGD(pgd) \
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tlbmiss_handler_setup_pgd((unsigned long)pgd, 0)
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#define TLBMISS_HANDLER_SETUP_PGD_KERNEL(pgd) \
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tlbmiss_handler_setup_pgd((unsigned long)pgd, 1)
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static inline unsigned long tlb_get_pgd(void)
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{
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return ((get_pgd()|(1<<31)) - PHYS_OFFSET) & ~1;
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}
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#define cpu_context(cpu, mm) ((mm)->context.asid[cpu])
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#define cpu_asid(cpu, mm) (cpu_context((cpu), (mm)) & ASID_MASK)
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#define asid_cache(cpu) (cpu_data[cpu].asid_cache)
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#define ASID_FIRST_VERSION (1 << CONFIG_CPU_ASID_BITS)
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#define ASID_INC 0x1
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#define ASID_MASK (ASID_FIRST_VERSION - 1)
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#define ASID_VERSION_MASK ~ASID_MASK
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#define destroy_context(mm) do {} while (0)
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#define enter_lazy_tlb(mm, tsk) do {} while (0)
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#define deactivate_mm(tsk, mm) do {} while (0)
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/*
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* All unused by hardware upper bits will be considered
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* as a software asid extension.
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*/
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static inline void
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get_new_mmu_context(struct mm_struct *mm, unsigned long cpu)
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{
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unsigned long asid = asid_cache(cpu);
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asid += ASID_INC;
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if (!(asid & ASID_MASK)) {
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flush_tlb_all(); /* start new asid cycle */
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if (!asid) /* fix version if needed */
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asid = ASID_FIRST_VERSION;
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}
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cpu_context(cpu, mm) = asid_cache(cpu) = asid;
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}
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/*
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* Initialize the context related info for a new mm_struct
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* instance.
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*/
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static inline int
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init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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{
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int i;
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for_each_online_cpu(i)
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cpu_context(i, mm) = 0;
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return 0;
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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unsigned int cpu = smp_processor_id();
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unsigned long flags;
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local_irq_save(flags);
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/* Check if our ASID is of an older version and thus invalid */
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if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & ASID_VERSION_MASK)
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get_new_mmu_context(next, cpu);
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write_mmu_entryhi(cpu_asid(cpu, next));
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TLBMISS_HANDLER_SETUP_PGD(next->pgd);
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/*
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* Mark current->active_mm as not "active" anymore.
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* We don't want to mislead possible IPI tlb flush routines.
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*/
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cpumask_clear_cpu(cpu, mm_cpumask(prev));
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cpumask_set_cpu(cpu, mm_cpumask(next));
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local_irq_restore(flags);
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}
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/*
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* After we have set current->mm to a new value, this activates
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* the context for the new mm so we see the new mappings.
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*/
|
||||
static inline void
|
||||
activate_mm(struct mm_struct *prev, struct mm_struct *next)
|
||||
{
|
||||
unsigned long flags;
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
/* Unconditionally get a new ASID. */
|
||||
get_new_mmu_context(next, cpu);
|
||||
|
||||
write_mmu_entryhi(cpu_asid(cpu, next));
|
||||
TLBMISS_HANDLER_SETUP_PGD(next->pgd);
|
||||
|
||||
/* mark mmu ownership change */
|
||||
cpumask_clear_cpu(cpu, mm_cpumask(prev));
|
||||
cpumask_set_cpu(cpu, mm_cpumask(next));
|
||||
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
|
||||
/*
|
||||
* If mm is currently active_mm, we can't really drop it. Instead,
|
||||
* we will get a new one for it.
|
||||
*/
|
||||
static inline void
|
||||
drop_mmu_context(struct mm_struct *mm, unsigned int cpu)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
if (cpumask_test_cpu(cpu, mm_cpumask(mm))) {
|
||||
get_new_mmu_context(mm, cpu);
|
||||
write_mmu_entryhi(cpu_asid(cpu, mm));
|
||||
} else {
|
||||
/* will get a new context next time */
|
||||
cpu_context(cpu, mm) = 0;
|
||||
}
|
||||
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
|
||||
#endif /* __ASM_CSKY_MMU_CONTEXT_H */
|
||||
121
arch/csky/include/asm/processor.h
Normal file
121
arch/csky/include/asm/processor.h
Normal file
@ -0,0 +1,121 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#ifndef __ASM_CSKY_PROCESSOR_H
|
||||
#define __ASM_CSKY_PROCESSOR_H
|
||||
|
||||
/*
|
||||
* Default implementation of macro that returns current
|
||||
* instruction pointer ("program counter").
|
||||
*/
|
||||
#define current_text_addr() ({ __label__ _l; _l: &&_l; })
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <asm/segment.h>
|
||||
#include <asm/ptrace.h>
|
||||
#include <asm/current.h>
|
||||
#include <asm/cache.h>
|
||||
#include <abi/reg_ops.h>
|
||||
#include <abi/regdef.h>
|
||||
#ifdef CONFIG_CPU_HAS_FPU
|
||||
#include <abi/fpu.h>
|
||||
#endif
|
||||
|
||||
struct cpuinfo_csky {
|
||||
unsigned long udelay_val;
|
||||
unsigned long asid_cache;
|
||||
/*
|
||||
* Capability and feature descriptor structure for CSKY CPU
|
||||
*/
|
||||
unsigned long options;
|
||||
unsigned int processor_id[4];
|
||||
unsigned int fpu_id;
|
||||
} __aligned(SMP_CACHE_BYTES);
|
||||
|
||||
extern struct cpuinfo_csky cpu_data[];
|
||||
|
||||
/*
|
||||
* User space process size: 2GB. This is hardcoded into a few places,
|
||||
* so don't change it unless you know what you are doing. TASK_SIZE
|
||||
* for a 64 bit kernel expandable to 8192EB, of which the current CSKY
|
||||
* implementations will "only" be able to use 1TB ...
|
||||
*/
|
||||
#define TASK_SIZE 0x7fff8000UL
|
||||
|
||||
#ifdef __KERNEL__
|
||||
#define STACK_TOP TASK_SIZE
|
||||
#define STACK_TOP_MAX STACK_TOP
|
||||
#endif
|
||||
|
||||
/* This decides where the kernel will search for a free chunk of vm
|
||||
* space during mmap's.
|
||||
*/
|
||||
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
|
||||
|
||||
struct thread_struct {
|
||||
unsigned long ksp; /* kernel stack pointer */
|
||||
unsigned long sr; /* saved status register */
|
||||
unsigned long esp0; /* points to SR of stack frame */
|
||||
unsigned long hi;
|
||||
unsigned long lo;
|
||||
|
||||
/* Other stuff associated with the thread. */
|
||||
unsigned long address; /* Last user fault */
|
||||
unsigned long error_code;
|
||||
|
||||
/* FPU regs */
|
||||
struct user_fp __aligned(16) user_fp;
|
||||
};
|
||||
|
||||
#define INIT_THREAD { \
|
||||
.ksp = (unsigned long) init_thread_union.stack + THREAD_SIZE, \
|
||||
.sr = DEFAULT_PSR_VALUE, \
|
||||
}
|
||||
|
||||
/*
|
||||
* Do necessary setup to start up a newly executed thread.
|
||||
*
|
||||
* pass the data segment into user programs if it exists,
|
||||
* it can't hurt anything as far as I can tell
|
||||
*/
|
||||
#define start_thread(_regs, _pc, _usp) \
|
||||
do { \
|
||||
set_fs(USER_DS); /* reads from user space */ \
|
||||
(_regs)->pc = (_pc); \
|
||||
(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \
|
||||
(_regs)->regs[2] = 0; \
|
||||
(_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \
|
||||
(_regs)->sr &= ~PS_S; \
|
||||
(_regs)->usp = (_usp); \
|
||||
} while (0)
|
||||
|
||||
/* Forward declaration, a strange C thing */
|
||||
struct task_struct;
|
||||
|
||||
/* Free all resources held by a thread. */
|
||||
static inline void release_thread(struct task_struct *dead_task)
|
||||
{
|
||||
}
|
||||
|
||||
/* Prepare to copy thread state - unlazy all lazy status */
|
||||
#define prepare_to_copy(tsk) do { } while (0)
|
||||
|
||||
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
|
||||
|
||||
#define copy_segments(tsk, mm) do { } while (0)
|
||||
#define release_segments(mm) do { } while (0)
|
||||
#define forget_segments() do { } while (0)
|
||||
|
||||
extern unsigned long thread_saved_pc(struct task_struct *tsk);
|
||||
|
||||
unsigned long get_wchan(struct task_struct *p);
|
||||
|
||||
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
|
||||
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp)
|
||||
|
||||
#define task_pt_regs(p) \
|
||||
((struct pt_regs *)(THREAD_SIZE + p->stack) - 1)
|
||||
|
||||
#define cpu_relax() barrier()
|
||||
|
||||
#endif /* __ASM_CSKY_PROCESSOR_H */
|
||||
36
arch/csky/include/asm/switch_to.h
Normal file
36
arch/csky/include/asm/switch_to.h
Normal file
@ -0,0 +1,36 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#ifndef __ASM_CSKY_SWITCH_TO_H
|
||||
#define __ASM_CSKY_SWITCH_TO_H
|
||||
|
||||
#include <linux/thread_info.h>
|
||||
#ifdef CONFIG_CPU_HAS_FPU
|
||||
#include <abi/fpu.h>
|
||||
static inline void __switch_to_fpu(struct task_struct *prev,
|
||||
struct task_struct *next)
|
||||
{
|
||||
save_to_user_fp(&prev->thread.user_fp);
|
||||
restore_from_user_fp(&next->thread.user_fp);
|
||||
}
|
||||
#else
|
||||
static inline void __switch_to_fpu(struct task_struct *prev,
|
||||
struct task_struct *next)
|
||||
{}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Context switching is now performed out-of-line in switch_to.S
|
||||
*/
|
||||
extern struct task_struct *__switch_to(struct task_struct *,
|
||||
struct task_struct *);
|
||||
|
||||
#define switch_to(prev, next, last) \
|
||||
do { \
|
||||
struct task_struct *__prev = (prev); \
|
||||
struct task_struct *__next = (next); \
|
||||
__switch_to_fpu(__prev, __next); \
|
||||
((last) = __switch_to((prev), (next))); \
|
||||
} while (0)
|
||||
|
||||
#endif /* __ASM_CSKY_SWITCH_TO_H */
|
||||
75
arch/csky/include/asm/thread_info.h
Normal file
75
arch/csky/include/asm/thread_info.h
Normal file
@ -0,0 +1,75 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#ifndef _ASM_CSKY_THREAD_INFO_H
|
||||
#define _ASM_CSKY_THREAD_INFO_H
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
#include <linux/version.h>
|
||||
#include <asm/types.h>
|
||||
#include <asm/page.h>
|
||||
#include <asm/processor.h>
|
||||
|
||||
struct thread_info {
|
||||
struct task_struct *task;
|
||||
void *dump_exec_domain;
|
||||
unsigned long flags;
|
||||
int preempt_count;
|
||||
unsigned long tp_value;
|
||||
mm_segment_t addr_limit;
|
||||
struct restart_block restart_block;
|
||||
struct pt_regs *regs;
|
||||
unsigned int cpu;
|
||||
};
|
||||
|
||||
#define INIT_THREAD_INFO(tsk) \
|
||||
{ \
|
||||
.task = &tsk, \
|
||||
.preempt_count = INIT_PREEMPT_COUNT, \
|
||||
.addr_limit = KERNEL_DS, \
|
||||
.cpu = 0, \
|
||||
.restart_block = { \
|
||||
.fn = do_no_restart_syscall, \
|
||||
}, \
|
||||
}
|
||||
|
||||
#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
|
||||
|
||||
static inline struct thread_info *current_thread_info(void)
|
||||
{
|
||||
unsigned long sp;
|
||||
|
||||
asm volatile("mov %0, sp\n":"=r"(sp));
|
||||
|
||||
return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
|
||||
}
|
||||
|
||||
#endif /* !__ASSEMBLY__ */
|
||||
|
||||
/* entry.S relies on these definitions!
|
||||
* bits 0-5 are tested at every exception exit
|
||||
*/
|
||||
#define TIF_SIGPENDING 0 /* signal pending */
|
||||
#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
|
||||
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
|
||||
#define TIF_SYSCALL_TRACE 5 /* syscall trace active */
|
||||
#define TIF_DELAYED_TRACE 14 /* single step a syscall */
|
||||
#define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */
|
||||
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
|
||||
#define TIF_FREEZE 19 /* thread is freezing for suspend */
|
||||
#define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */
|
||||
#define TIF_SECCOMP 21 /* secure computing */
|
||||
|
||||
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
|
||||
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
|
||||
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
|
||||
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
|
||||
#define _TIF_DELAYED_TRACE (1 << TIF_DELAYED_TRACE)
|
||||
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
|
||||
#define _TIF_MEMDIE (1 << TIF_MEMDIE)
|
||||
#define _TIF_FREEZE (1 << TIF_FREEZE)
|
||||
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
|
||||
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
|
||||
|
||||
#endif /* _ASM_CSKY_THREAD_INFO_H */
|
||||
14
arch/csky/include/uapi/asm/sigcontext.h
Normal file
14
arch/csky/include/uapi/asm/sigcontext.h
Normal file
@ -0,0 +1,14 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#ifndef __ASM_CSKY_SIGCONTEXT_H
|
||||
#define __ASM_CSKY_SIGCONTEXT_H
|
||||
|
||||
#include <asm/ptrace.h>
|
||||
|
||||
struct sigcontext {
|
||||
struct pt_regs sc_pt_regs;
|
||||
struct user_fp sc_user_fp;
|
||||
};
|
||||
|
||||
#endif /* __ASM_CSKY_SIGCONTEXT_H */
|
||||
136
arch/csky/kernel/process.c
Normal file
136
arch/csky/kernel/process.c
Normal file
@ -0,0 +1,136 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/version.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/sched/task_stack.h>
|
||||
#include <linux/sched/debug.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/ptrace.h>
|
||||
|
||||
#include <asm/elf.h>
|
||||
#include <abi/reg_ops.h>
|
||||
|
||||
struct cpuinfo_csky cpu_data[NR_CPUS];
|
||||
|
||||
asmlinkage void ret_from_fork(void);
|
||||
asmlinkage void ret_from_kernel_thread(void);
|
||||
|
||||
/*
|
||||
* Some archs flush debug and FPU info here
|
||||
*/
|
||||
void flush_thread(void){}
|
||||
|
||||
/*
|
||||
* Return saved PC from a blocked thread
|
||||
*/
|
||||
unsigned long thread_saved_pc(struct task_struct *tsk)
|
||||
{
|
||||
struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
|
||||
|
||||
return sw->r15;
|
||||
}
|
||||
|
||||
int copy_thread(unsigned long clone_flags,
|
||||
unsigned long usp,
|
||||
unsigned long kthread_arg,
|
||||
struct task_struct *p)
|
||||
{
|
||||
struct switch_stack *childstack;
|
||||
struct pt_regs *childregs = task_pt_regs(p);
|
||||
|
||||
#ifdef CONFIG_CPU_HAS_FPU
|
||||
save_to_user_fp(&p->thread.user_fp);
|
||||
#endif
|
||||
|
||||
childstack = ((struct switch_stack *) childregs) - 1;
|
||||
memset(childstack, 0, sizeof(struct switch_stack));
|
||||
|
||||
/* setup ksp for switch_to !!! */
|
||||
p->thread.ksp = (unsigned long)childstack;
|
||||
|
||||
if (unlikely(p->flags & PF_KTHREAD)) {
|
||||
memset(childregs, 0, sizeof(struct pt_regs));
|
||||
childstack->r15 = (unsigned long) ret_from_kernel_thread;
|
||||
childstack->r8 = kthread_arg;
|
||||
childstack->r9 = usp;
|
||||
childregs->sr = mfcr("psr");
|
||||
} else {
|
||||
*childregs = *(current_pt_regs());
|
||||
if (usp)
|
||||
childregs->usp = usp;
|
||||
if (clone_flags & CLONE_SETTLS)
|
||||
task_thread_info(p)->tp_value = childregs->tls
|
||||
= childregs->regs[0];
|
||||
|
||||
childregs->a0 = 0;
|
||||
childstack->r15 = (unsigned long) ret_from_fork;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Fill in the fpu structure for a core dump. */
|
||||
int dump_fpu(struct pt_regs *regs, struct user_fp *fpu)
|
||||
{
|
||||
memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu));
|
||||
return 1;
|
||||
}
|
||||
EXPORT_SYMBOL(dump_fpu);
|
||||
|
||||
int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
|
||||
{
|
||||
struct pt_regs *regs = task_pt_regs(tsk);
|
||||
|
||||
/* NOTE: usp is error value. */
|
||||
ELF_CORE_COPY_REGS((*pr_regs), regs)
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
unsigned long get_wchan(struct task_struct *p)
|
||||
{
|
||||
unsigned long esp, pc;
|
||||
unsigned long stack_page;
|
||||
int count = 0;
|
||||
|
||||
if (!p || p == current || p->state == TASK_RUNNING)
|
||||
return 0;
|
||||
|
||||
stack_page = (unsigned long)p;
|
||||
esp = p->thread.esp0;
|
||||
do {
|
||||
if (esp < stack_page+sizeof(struct task_struct) ||
|
||||
esp >= 8184+stack_page)
|
||||
return 0;
|
||||
/*FIXME: There's may be error here!*/
|
||||
pc = ((unsigned long *)esp)[1];
|
||||
/* FIXME: This depends on the order of these functions. */
|
||||
if (!in_sched_functions(pc))
|
||||
return pc;
|
||||
esp = *(unsigned long *) esp;
|
||||
} while (count++ < 16);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(get_wchan);
|
||||
|
||||
#ifndef CONFIG_CPU_PM_NONE
|
||||
void arch_cpu_idle(void)
|
||||
{
|
||||
#ifdef CONFIG_CPU_PM_WAIT
|
||||
asm volatile("wait\n");
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_CPU_PM_DOZE
|
||||
asm volatile("doze\n");
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_CPU_PM_STOP
|
||||
asm volatile("stop\n");
|
||||
#endif
|
||||
local_irq_enable();
|
||||
}
|
||||
#endif
|
||||
347
arch/csky/kernel/signal.c
Normal file
347
arch/csky/kernel/signal.c
Normal file
@ -0,0 +1,347 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#include <linux/sched.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/signal.h>
|
||||
#include <linux/syscalls.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/wait.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/unistd.h>
|
||||
#include <linux/stddef.h>
|
||||
#include <linux/highuid.h>
|
||||
#include <linux/personality.h>
|
||||
#include <linux/tty.h>
|
||||
#include <linux/binfmts.h>
|
||||
#include <linux/tracehook.h>
|
||||
#include <linux/freezer.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
#include <asm/setup.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/traps.h>
|
||||
#include <asm/ucontext.h>
|
||||
#include <asm/vdso.h>
|
||||
|
||||
#include <abi/regdef.h>
|
||||
|
||||
#ifdef CONFIG_CPU_HAS_FPU
|
||||
#include <abi/fpu.h>
|
||||
|
||||
static int restore_fpu_state(struct sigcontext *sc)
|
||||
{
|
||||
int err = 0;
|
||||
struct user_fp user_fp;
|
||||
|
||||
err = copy_from_user(&user_fp, &sc->sc_user_fp, sizeof(user_fp));
|
||||
|
||||
restore_from_user_fp(&user_fp);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int save_fpu_state(struct sigcontext *sc)
|
||||
{
|
||||
struct user_fp user_fp;
|
||||
|
||||
save_to_user_fp(&user_fp);
|
||||
|
||||
return copy_to_user(&sc->sc_user_fp, &user_fp, sizeof(user_fp));
|
||||
}
|
||||
#else
|
||||
static inline int restore_fpu_state(struct sigcontext *sc) { return 0; }
|
||||
static inline int save_fpu_state(struct sigcontext *sc) { return 0; }
|
||||
#endif
|
||||
|
||||
struct rt_sigframe {
|
||||
int sig;
|
||||
struct siginfo *pinfo;
|
||||
void *puc;
|
||||
struct siginfo info;
|
||||
struct ucontext uc;
|
||||
};
|
||||
|
||||
static int
|
||||
restore_sigframe(struct pt_regs *regs,
|
||||
struct sigcontext *sc, int *pr2)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
/* Always make any pending restarted system calls return -EINTR */
|
||||
current_thread_info()->task->restart_block.fn = do_no_restart_syscall;
|
||||
|
||||
err |= copy_from_user(regs, &sc->sc_pt_regs, sizeof(struct pt_regs));
|
||||
|
||||
err |= restore_fpu_state(sc);
|
||||
|
||||
*pr2 = regs->a0;
|
||||
return err;
|
||||
}
|
||||
|
||||
asmlinkage int
|
||||
do_rt_sigreturn(void)
|
||||
{
|
||||
sigset_t set;
|
||||
int a0;
|
||||
struct pt_regs *regs = current_pt_regs();
|
||||
struct rt_sigframe *frame = (struct rt_sigframe *)(regs->usp);
|
||||
|
||||
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
||||
goto badframe;
|
||||
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
|
||||
goto badframe;
|
||||
|
||||
sigdelsetmask(&set, (sigmask(SIGKILL) | sigmask(SIGSTOP)));
|
||||
spin_lock_irq(¤t->sighand->siglock);
|
||||
current->blocked = set;
|
||||
recalc_sigpending();
|
||||
spin_unlock_irq(¤t->sighand->siglock);
|
||||
|
||||
if (restore_sigframe(regs, &frame->uc.uc_mcontext, &a0))
|
||||
goto badframe;
|
||||
|
||||
return a0;
|
||||
|
||||
badframe:
|
||||
force_sig(SIGSEGV, current);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int setup_sigframe(struct sigcontext *sc, struct pt_regs *regs)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
err |= copy_to_user(&sc->sc_pt_regs, regs, sizeof(struct pt_regs));
|
||||
err |= save_fpu_state(sc);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static inline void *
|
||||
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
|
||||
{
|
||||
unsigned long usp;
|
||||
|
||||
/* Default to using normal stack. */
|
||||
usp = regs->usp;
|
||||
|
||||
/* This is the X/Open sanctioned signal stack switching. */
|
||||
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(usp)) {
|
||||
if (!on_sig_stack(usp))
|
||||
usp = current->sas_ss_sp + current->sas_ss_size;
|
||||
}
|
||||
return (void *)((usp - frame_size) & -8UL);
|
||||
}
|
||||
|
||||
static int
|
||||
setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
|
||||
{
|
||||
struct rt_sigframe *frame;
|
||||
int err = 0;
|
||||
|
||||
struct csky_vdso *vdso = current->mm->context.vdso;
|
||||
|
||||
frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
|
||||
if (!frame)
|
||||
return 1;
|
||||
|
||||
err |= __put_user(ksig->sig, &frame->sig);
|
||||
err |= __put_user(&frame->info, &frame->pinfo);
|
||||
err |= __put_user(&frame->uc, &frame->puc);
|
||||
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
|
||||
|
||||
/* Create the ucontext. */
|
||||
err |= __put_user(0, &frame->uc.uc_flags);
|
||||
err |= __put_user(0, &frame->uc.uc_link);
|
||||
err |= __put_user((void *)current->sas_ss_sp,
|
||||
&frame->uc.uc_stack.ss_sp);
|
||||
err |= __put_user(sas_ss_flags(regs->usp),
|
||||
&frame->uc.uc_stack.ss_flags);
|
||||
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
||||
err |= setup_sigframe(&frame->uc.uc_mcontext, regs);
|
||||
err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
||||
|
||||
if (err)
|
||||
goto give_sigsegv;
|
||||
|
||||
/* Set up registers for signal handler */
|
||||
regs->usp = (unsigned long)frame;
|
||||
regs->pc = (unsigned long)ksig->ka.sa.sa_handler;
|
||||
regs->lr = (unsigned long)vdso->rt_signal_retcode;
|
||||
|
||||
adjust_stack:
|
||||
regs->a0 = ksig->sig; /* first arg is signo */
|
||||
regs->a1 = (unsigned long)(&(frame->info));
|
||||
regs->a2 = (unsigned long)(&(frame->uc));
|
||||
return err;
|
||||
|
||||
give_sigsegv:
|
||||
if (ksig->sig == SIGSEGV)
|
||||
ksig->ka.sa.sa_handler = SIG_DFL;
|
||||
force_sig(SIGSEGV, current);
|
||||
goto adjust_stack;
|
||||
}
|
||||
|
||||
/*
|
||||
* OK, we're invoking a handler
|
||||
*/
|
||||
static int
|
||||
handle_signal(struct ksignal *ksig, struct pt_regs *regs)
|
||||
{
|
||||
int ret;
|
||||
sigset_t *oldset = sigmask_to_save();
|
||||
|
||||
/*
|
||||
* set up the stack frame, regardless of SA_SIGINFO,
|
||||
* and pass info anyway.
|
||||
*/
|
||||
ret = setup_rt_frame(ksig, oldset, regs);
|
||||
|
||||
if (ret != 0) {
|
||||
force_sigsegv(ksig->sig, current);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Block the signal if we were successful. */
|
||||
spin_lock_irq(¤t->sighand->siglock);
|
||||
sigorsets(¤t->blocked, ¤t->blocked, &ksig->ka.sa.sa_mask);
|
||||
if (!(ksig->ka.sa.sa_flags & SA_NODEFER))
|
||||
sigaddset(¤t->blocked, ksig->sig);
|
||||
recalc_sigpending();
|
||||
spin_unlock_irq(¤t->sighand->siglock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
||||
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
||||
* mistake.
|
||||
*
|
||||
* Note that we go through the signals twice: once to check the signals
|
||||
* that the kernel can handle, and then we build all the user-level signal
|
||||
* handling stack-frames in one go after that.
|
||||
*/
|
||||
static void do_signal(struct pt_regs *regs, int syscall)
|
||||
{
|
||||
unsigned int retval = 0, continue_addr = 0, restart_addr = 0;
|
||||
struct ksignal ksig;
|
||||
|
||||
/*
|
||||
* We want the common case to go fast, which
|
||||
* is why we may in certain cases get here from
|
||||
* kernel mode. Just return without doing anything
|
||||
* if so.
|
||||
*/
|
||||
if (!user_mode(regs))
|
||||
return;
|
||||
|
||||
current->thread.esp0 = (unsigned long)regs;
|
||||
|
||||
/*
|
||||
* If we were from a system call, check for system call restarting...
|
||||
*/
|
||||
if (syscall) {
|
||||
continue_addr = regs->pc;
|
||||
#if defined(__CSKYABIV2__)
|
||||
restart_addr = continue_addr - 4;
|
||||
#else
|
||||
restart_addr = continue_addr - 2;
|
||||
#endif
|
||||
retval = regs->a0;
|
||||
|
||||
/*
|
||||
* Prepare for system call restart. We do this here so that a
|
||||
* debugger will see the already changed.
|
||||
*/
|
||||
switch (retval) {
|
||||
case -ERESTARTNOHAND:
|
||||
case -ERESTARTSYS:
|
||||
case -ERESTARTNOINTR:
|
||||
regs->a0 = regs->orig_a0;
|
||||
regs->pc = restart_addr;
|
||||
break;
|
||||
case -ERESTART_RESTARTBLOCK:
|
||||
regs->a0 = -EINTR;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (try_to_freeze())
|
||||
goto no_signal;
|
||||
|
||||
/*
|
||||
* Get the signal to deliver. When running under ptrace, at this
|
||||
* point the debugger may change all our registers ...
|
||||
*/
|
||||
if (get_signal(&ksig)) {
|
||||
/*
|
||||
* Depending on the signal settings we may need to revert the
|
||||
* decision to restart the system call. But skip this if a
|
||||
* debugger has chosen to restart at a different PC.
|
||||
*/
|
||||
if (regs->pc == restart_addr) {
|
||||
if (retval == -ERESTARTNOHAND ||
|
||||
(retval == -ERESTARTSYS &&
|
||||
!(ksig.ka.sa.sa_flags & SA_RESTART))) {
|
||||
regs->a0 = -EINTR;
|
||||
regs->pc = continue_addr;
|
||||
}
|
||||
}
|
||||
|
||||
/* Whee! Actually deliver the signal. */
|
||||
if (handle_signal(&ksig, regs) == 0) {
|
||||
/*
|
||||
* A signal was successfully delivered; the saved
|
||||
* sigmask will have been stored in the signal frame,
|
||||
* and will be restored by sigreturn, so we can simply
|
||||
* clear the TIF_RESTORE_SIGMASK flag.
|
||||
*/
|
||||
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
||||
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
no_signal:
|
||||
if (syscall) {
|
||||
/*
|
||||
* Handle restarting a different system call. As above,
|
||||
* if a debugger has chosen to restart at a different PC,
|
||||
* ignore the restart.
|
||||
*/
|
||||
if (retval == -ERESTART_RESTARTBLOCK
|
||||
&& regs->pc == continue_addr) {
|
||||
#if defined(__CSKYABIV2__)
|
||||
regs->regs[3] = __NR_restart_syscall;
|
||||
regs->pc -= 4;
|
||||
#else
|
||||
regs->regs[9] = __NR_restart_syscall;
|
||||
regs->pc -= 2;
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* If there's no signal to deliver, we just put the saved
|
||||
* sigmask back.
|
||||
*/
|
||||
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
|
||||
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
asmlinkage void
|
||||
do_notify_resume(unsigned int thread_flags, struct pt_regs *regs, int syscall)
|
||||
{
|
||||
if (thread_flags & _TIF_SIGPENDING)
|
||||
do_signal(regs, syscall);
|
||||
|
||||
if (thread_flags & _TIF_NOTIFY_RESUME) {
|
||||
clear_thread_flag(TIF_NOTIFY_RESUME);
|
||||
tracehook_notify_resume(regs);
|
||||
}
|
||||
}
|
||||
11
arch/csky/kernel/time.c
Normal file
11
arch/csky/kernel/time.c
Normal file
@ -0,0 +1,11 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||||
|
||||
#include <linux/clk-provider.h>
|
||||
#include <linux/clocksource.h>
|
||||
|
||||
void __init time_init(void)
|
||||
{
|
||||
of_clk_init(NULL);
|
||||
timer_probe();
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user