/* * SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ /** * This file describes the frame types for RISC-V, required for * parsing `eh_frame` and `eh_frame_hdr`, and more generally libunwind. */ #pragma once #include #include "esp_attr.h" #include "riscv/rvruntime-frames.h" #ifdef __cplusplus extern "C" { #endif /** * @brief Define the size of a CPU register. */ #define ARCH_WORD_SIZE (sizeof(long)) /** * @brief Retrive the index of a field inside a structure. All the fields * must have a word size. */ #define indexof(structure,field) (offsetof(structure, field) / ARCH_WORD_SIZE) /** * @brief Define the Executionframe as RvExcFrame for this implementation. */ typedef RvExcFrame ExecutionFrame; /** * @brief Enumeration of all the registers for RISC-V architecture */ typedef enum { UNW_RISCV_PC = indexof(ExecutionFrame, mepc), UNW_RISCV_RA = indexof(ExecutionFrame, ra), UNW_RISCV_SP = indexof(ExecutionFrame, sp), UNW_RISCV_GP = indexof(ExecutionFrame, gp), UNW_RISCV_TP = indexof(ExecutionFrame, tp), UNW_RISCV_T0 = indexof(ExecutionFrame, t0), UNW_RISCV_T1 = indexof(ExecutionFrame, t1), UNW_RISCV_T2 = indexof(ExecutionFrame, t2), UNW_RISCV_S0 = indexof(ExecutionFrame, s0), UNW_RISCV_S1 = indexof(ExecutionFrame, s1), UNW_RISCV_A0 = indexof(ExecutionFrame, a0), UNW_RISCV_A1 = indexof(ExecutionFrame, a1), UNW_RISCV_A2 = indexof(ExecutionFrame, a2), UNW_RISCV_A3 = indexof(ExecutionFrame, a3), UNW_RISCV_A4 = indexof(ExecutionFrame, a4), UNW_RISCV_A5 = indexof(ExecutionFrame, a5), UNW_RISCV_A6 = indexof(ExecutionFrame, a6), UNW_RISCV_A7 = indexof(ExecutionFrame, a7), UNW_RISCV_S2 = indexof(ExecutionFrame, s2), UNW_RISCV_S3 = indexof(ExecutionFrame, s3), UNW_RISCV_S4 = indexof(ExecutionFrame, s4), UNW_RISCV_S5 = indexof(ExecutionFrame, s5), UNW_RISCV_S6 = indexof(ExecutionFrame, s6), UNW_RISCV_S7 = indexof(ExecutionFrame, s7), UNW_RISCV_S8 = indexof(ExecutionFrame, s8), UNW_RISCV_S9 = indexof(ExecutionFrame, s9), UNW_RISCV_S10 = indexof(ExecutionFrame, s10), UNW_RISCV_S11 = indexof(ExecutionFrame, s11), UNW_RISCV_T3 = indexof(ExecutionFrame, t3), UNW_RISCV_T4 = indexof(ExecutionFrame, t4), UNW_RISCV_T5 = indexof(ExecutionFrame, t5), UNW_RISCV_T6 = indexof(ExecutionFrame, t6), UNW_RISCV_MSTATUS = indexof(ExecutionFrame, mstatus), UNW_RISCV_MTVEC = indexof(ExecutionFrame, mtvec), UNW_RISCV_MCAUSE = indexof(ExecutionFrame, mcause), UNW_RISCV_MTVAL = indexof(ExecutionFrame, mtval), UNW_RISCV_MHARTID = indexof(ExecutionFrame, mhartid), } riscv_regnum_t; /** * @brief Number of registers in the ExecutionFrame structure. * * This will be used to define and initialize the DWARF machine state. * In practice, we only have 16 registers that are callee saved, thus, we could * only save them and ignore the rest. However, code to calculate mapping of * CPU registers to DWARF registers would take more than the 16 registers we * would save... so save all registers. */ #define EXECUTION_FRAME_MAX_REGS (32) /** * @brief Reference the PC register of the execution frame. */ #define EXECUTION_FRAME_PC(frame) ((frame).mepc) /** * @brief Reference the SP register of the execution frame. */ #define EXECUTION_FRAME_SP(frame) ((frame).sp) /** * @brief Index of SP register in the execution frame. */ #define EXECUTION_FRAME_SP_REG (indexof(RvExcFrame, sp)) /** * @brief Get register i of the execution frame. */ #define EXECUTION_FRAME_REG(frame, i) (((uint32_t*) (frame))[(i)]) /** * @brief Get the current context */ FORCE_INLINE_ATTR void UNW_GET_CONTEXT(ExecutionFrame* frame) { __asm__ __volatile__("sw t0, %1(%0)\n" "auipc t0, 0\n" "sw t0, %2(%0)\n" "sw ra, %3(%0)\n" "sw sp, %4(%0)\n" "sw gp, %5(%0)\n" "sw tp, %6(%0)\n" "sw t1, %7(%0)\n" "sw t2, %8(%0)\n" "sw s0, %9(%0)\n" "sw s1, %10(%0)\n" "sw a0, %11(%0)\n" "sw a1, %12(%0)\n" "sw a2, %13(%0)\n" "sw a3, %14(%0)\n" "sw a4, %15(%0)\n" "sw a5, %16(%0)\n" "sw a6, %17(%0)\n" "sw a7, %18(%0)\n" "sw s2, %19(%0)\n" "sw s3, %20(%0)\n" "sw s4, %21(%0)\n" "sw s5, %22(%0)\n" "sw s6, %23(%0)\n" "sw s7, %24(%0)\n" "sw s8, %25(%0)\n" "sw s9, %26(%0)\n" "sw s10, %27(%0)\n" "sw s11, %28(%0)\n" "sw t3, %29(%0)\n" : : "r" (frame), "i" (UNW_RISCV_T0 * ARCH_WORD_SIZE), "i" (UNW_RISCV_PC * ARCH_WORD_SIZE), "i" (UNW_RISCV_RA * ARCH_WORD_SIZE), "i" (UNW_RISCV_SP * ARCH_WORD_SIZE), "i" (UNW_RISCV_GP * ARCH_WORD_SIZE), "i" (UNW_RISCV_TP * ARCH_WORD_SIZE), "i" (UNW_RISCV_T1 * ARCH_WORD_SIZE), "i" (UNW_RISCV_T2 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S0 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S1 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A0 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A1 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A2 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A3 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A4 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A5 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A6 * ARCH_WORD_SIZE), "i" (UNW_RISCV_A7 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S2 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S3 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S4 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S5 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S6 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S7 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S8 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S9 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S10 * ARCH_WORD_SIZE), "i" (UNW_RISCV_S11 * ARCH_WORD_SIZE), "i" (UNW_RISCV_T3 * ARCH_WORD_SIZE) ); /* GCC doesn't allow us to have more than 30 operands in a single * __asm__ __volatile__ definition, so we have to split it into 2 */ __asm__ __volatile__("sw t4, %1(%0)\n" "sw t5, %2(%0)\n" "sw t6, %3(%0)\n" "csrr t0, mstatus\n" "sw t0, %4(%0)\n" "csrr t0, mtvec\n" "sw t0, %5(%0)\n" "csrr t0, mcause\n" "sw t0, %6(%0)\n" "csrr t0, mtval\n" "sw t0, %7(%0)\n" "csrr t0, mhartid\n" "sw t0, %8(%0)\n" /* We have to restore t0 as it may be in use by the function that makes the use of this assembly snippet */ "lw t0, %9(%0)\n" : : "r" (frame), "i" (UNW_RISCV_T4 * ARCH_WORD_SIZE), "i" (UNW_RISCV_T5 * ARCH_WORD_SIZE), "i" (UNW_RISCV_T6 * ARCH_WORD_SIZE), "i" (UNW_RISCV_MSTATUS * ARCH_WORD_SIZE), "i" (UNW_RISCV_MTVEC * ARCH_WORD_SIZE), "i" (UNW_RISCV_MCAUSE * ARCH_WORD_SIZE), "i" (UNW_RISCV_MTVAL * ARCH_WORD_SIZE), "i" (UNW_RISCV_MHARTID * ARCH_WORD_SIZE), "i" (UNW_RISCV_T0 * ARCH_WORD_SIZE) ); } #ifdef __cplusplus } #endif