diff options
Diffstat (limited to 'arch/csky/abiv2/fpu.c')
| -rw-r--r-- | arch/csky/abiv2/fpu.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/arch/csky/abiv2/fpu.c b/arch/csky/abiv2/fpu.c new file mode 100644 index 0000000000..5acc5c2e54 --- /dev/null +++ b/arch/csky/abiv2/fpu.c @@ -0,0 +1,270 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/ptrace.h> +#include <linux/uaccess.h> +#include <abi/reg_ops.h> + +#define MTCR_MASK 0xFC00FFE0 +#define MFCR_MASK 0xFC00FFE0 +#define MTCR_DIST 0xC0006420 +#define MFCR_DIST 0xC0006020 + +/* + * fpu_libc_helper() is to help libc to excute: + * - mfcr %a, cr<1, 2> + * - mfcr %a, cr<2, 2> + * - mtcr %a, cr<1, 2> + * - mtcr %a, cr<2, 2> + */ +int fpu_libc_helper(struct pt_regs *regs) +{ + int fault; + unsigned long instrptr, regx = 0; + unsigned long index = 0, tmp = 0; + unsigned long tinstr = 0; + u16 instr_hi, instr_low; + + instrptr = instruction_pointer(regs); + if (instrptr & 1) + return 0; + + fault = __get_user(instr_low, (u16 *)instrptr); + if (fault) + return 0; + + fault = __get_user(instr_hi, (u16 *)(instrptr + 2)); + if (fault) + return 0; + + tinstr = instr_hi | ((unsigned long)instr_low << 16); + + if (((tinstr >> 21) & 0x1F) != 2) + return 0; + + if ((tinstr & MTCR_MASK) == MTCR_DIST) { + index = (tinstr >> 16) & 0x1F; + if (index > 13) + return 0; + + tmp = tinstr & 0x1F; + if (tmp > 2) + return 0; + + regx = *(®s->a0 + index); + + if (tmp == 1) + mtcr("cr<1, 2>", regx); + else if (tmp == 2) + mtcr("cr<2, 2>", regx); + else + return 0; + + regs->pc += 4; + return 1; + } + + if ((tinstr & MFCR_MASK) == MFCR_DIST) { + index = tinstr & 0x1F; + if (index > 13) + return 0; + + tmp = ((tinstr >> 16) & 0x1F); + if (tmp > 2) + return 0; + + if (tmp == 1) + regx = mfcr("cr<1, 2>"); + else if (tmp == 2) + regx = mfcr("cr<2, 2>"); + else + return 0; + + *(®s->a0 + index) = regx; + + regs->pc += 4; + return 1; + } + + return 0; +} + +void fpu_fpe(struct pt_regs *regs) +{ + int sig, code; + unsigned int fesr; + + fesr = mfcr("cr<2, 2>"); + + sig = SIGFPE; + code = FPE_FLTUNK; + + if (fesr & FPE_ILLE) { + sig = SIGILL; + code = ILL_ILLOPC; + } else if (fesr & FPE_IDC) { + sig = SIGILL; + code = ILL_ILLOPN; + } else if (fesr & FPE_FEC) { + sig = SIGFPE; + if (fesr & FPE_IOC) + code = FPE_FLTINV; + else if (fesr & FPE_DZC) + code = FPE_FLTDIV; + else if (fesr & FPE_UFC) + code = FPE_FLTUND; + else if (fesr & FPE_OFC) + code = FPE_FLTOVF; + else if (fesr & FPE_IXC) + code = FPE_FLTRES; + } + + force_sig_fault(sig, code, (void __user *)regs->pc); +} + +#define FMFVR_FPU_REGS(vrx, vry) \ + "fmfvrl %0, "#vrx"\n" \ + "fmfvrh %1, "#vrx"\n" \ + "fmfvrl %2, "#vry"\n" \ + "fmfvrh %3, "#vry"\n" + +#define FMTVR_FPU_REGS(vrx, vry) \ + "fmtvrl "#vrx", %0\n" \ + "fmtvrh "#vrx", %1\n" \ + "fmtvrl "#vry", %2\n" \ + "fmtvrh "#vry", %3\n" + +#define STW_FPU_REGS(a, b, c, d) \ + "stw %0, (%4, "#a")\n" \ + "stw %1, (%4, "#b")\n" \ + "stw %2, (%4, "#c")\n" \ + "stw %3, (%4, "#d")\n" + +#define LDW_FPU_REGS(a, b, c, d) \ + "ldw %0, (%4, "#a")\n" \ + "ldw %1, (%4, "#b")\n" \ + "ldw %2, (%4, "#c")\n" \ + "ldw %3, (%4, "#d")\n" + +void save_to_user_fp(struct user_fp *user_fp) +{ + unsigned long flg; + unsigned long tmp1, tmp2; + unsigned long *fpregs; + + local_irq_save(flg); + + tmp1 = mfcr("cr<1, 2>"); + tmp2 = mfcr("cr<2, 2>"); + + user_fp->fcr = tmp1; + user_fp->fesr = tmp2; + + fpregs = &user_fp->vr[0]; +#ifdef CONFIG_CPU_HAS_FPUV2 +#ifdef CONFIG_CPU_HAS_VDSP + asm volatile( + "vstmu.32 vr0-vr3, (%0)\n" + "vstmu.32 vr4-vr7, (%0)\n" + "vstmu.32 vr8-vr11, (%0)\n" + "vstmu.32 vr12-vr15, (%0)\n" + "fstmu.64 vr16-vr31, (%0)\n" + : "+a"(fpregs) + ::"memory"); +#else + asm volatile( + "fstmu.64 vr0-vr31, (%0)\n" + : "+a"(fpregs) + ::"memory"); +#endif +#else + { + unsigned long tmp3, tmp4; + + asm volatile( + FMFVR_FPU_REGS(vr0, vr1) + STW_FPU_REGS(0, 4, 16, 20) + FMFVR_FPU_REGS(vr2, vr3) + STW_FPU_REGS(32, 36, 48, 52) + FMFVR_FPU_REGS(vr4, vr5) + STW_FPU_REGS(64, 68, 80, 84) + FMFVR_FPU_REGS(vr6, vr7) + STW_FPU_REGS(96, 100, 112, 116) + "addi %4, 128\n" + FMFVR_FPU_REGS(vr8, vr9) + STW_FPU_REGS(0, 4, 16, 20) + FMFVR_FPU_REGS(vr10, vr11) + STW_FPU_REGS(32, 36, 48, 52) + FMFVR_FPU_REGS(vr12, vr13) + STW_FPU_REGS(64, 68, 80, 84) + FMFVR_FPU_REGS(vr14, vr15) + STW_FPU_REGS(96, 100, 112, 116) + : "=a"(tmp1), "=a"(tmp2), "=a"(tmp3), + "=a"(tmp4), "+a"(fpregs) + ::"memory"); + } +#endif + + local_irq_restore(flg); +} + +void restore_from_user_fp(struct user_fp *user_fp) +{ + unsigned long flg; + unsigned long tmp1, tmp2; + unsigned long *fpregs; + + local_irq_save(flg); + + tmp1 = user_fp->fcr; + tmp2 = user_fp->fesr; + + mtcr("cr<1, 2>", tmp1); + mtcr("cr<2, 2>", tmp2); + + fpregs = &user_fp->vr[0]; +#ifdef CONFIG_CPU_HAS_FPUV2 +#ifdef CONFIG_CPU_HAS_VDSP + asm volatile( + "vldmu.32 vr0-vr3, (%0)\n" + "vldmu.32 vr4-vr7, (%0)\n" + "vldmu.32 vr8-vr11, (%0)\n" + "vldmu.32 vr12-vr15, (%0)\n" + "fldmu.64 vr16-vr31, (%0)\n" + : "+a"(fpregs) + ::"memory"); +#else + asm volatile( + "fldmu.64 vr0-vr31, (%0)\n" + : "+a"(fpregs) + ::"memory"); +#endif +#else + { + unsigned long tmp3, tmp4; + + asm volatile( + LDW_FPU_REGS(0, 4, 16, 20) + FMTVR_FPU_REGS(vr0, vr1) + LDW_FPU_REGS(32, 36, 48, 52) + FMTVR_FPU_REGS(vr2, vr3) + LDW_FPU_REGS(64, 68, 80, 84) + FMTVR_FPU_REGS(vr4, vr5) + LDW_FPU_REGS(96, 100, 112, 116) + FMTVR_FPU_REGS(vr6, vr7) + "addi %4, 128\n" + LDW_FPU_REGS(0, 4, 16, 20) + FMTVR_FPU_REGS(vr8, vr9) + LDW_FPU_REGS(32, 36, 48, 52) + FMTVR_FPU_REGS(vr10, vr11) + LDW_FPU_REGS(64, 68, 80, 84) + FMTVR_FPU_REGS(vr12, vr13) + LDW_FPU_REGS(96, 100, 112, 116) + FMTVR_FPU_REGS(vr14, vr15) + : "=a"(tmp1), "=a"(tmp2), "=a"(tmp3), + "=a"(tmp4), "+a"(fpregs) + ::"memory"); + } +#endif + local_irq_restore(flg); +} |