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-rw-r--r--pk/emulation.c313
1 files changed, 0 insertions, 313 deletions
diff --git a/pk/emulation.c b/pk/emulation.c
deleted file mode 100644
index 5a66997..0000000
--- a/pk/emulation.c
+++ /dev/null
@@ -1,313 +0,0 @@
-#include "emulation.h"
-#include "fp_emulation.h"
-#include "config.h"
-#include "unprivileged_memory.h"
-#include "mtrap.h"
-#include <limits.h>
-
-void illegal_insn_trap(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc)
-{
- asm (".pushsection .rodata\n"
- "illegal_insn_trap_table:\n"
- " .word truly_illegal_insn\n"
-#ifdef PK_ENABLE_FP_EMULATION
- " .word emulate_float_load\n"
-#else
- " .word truly_illegal_insn\n"
-#endif
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
-#ifdef PK_ENABLE_FP_EMULATION
- " .word emulate_float_store\n"
-#else
- " .word truly_illegal_insn\n"
-#endif
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word emulate_mul_div\n"
- " .word truly_illegal_insn\n"
- " .word emulate_mul_div32\n"
- " .word truly_illegal_insn\n"
-#ifdef PK_ENABLE_FP_EMULATION
- " .word emulate_fmadd\n"
- " .word emulate_fmadd\n"
- " .word emulate_fmadd\n"
- " .word emulate_fmadd\n"
- " .word emulate_fp\n"
-#else
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
-#endif
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word emulate_system\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .word truly_illegal_insn\n"
- " .popsection");
-
- uintptr_t mstatus;
- insn_t insn = get_insn(mepc, &mstatus);
-
- if (unlikely((insn & 3) != 3))
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- write_csr(mepc, mepc + 4);
-
- extern int32_t illegal_insn_trap_table[];
- int32_t* pf = (void*)illegal_insn_trap_table + (insn & 0x7c);
- emulation_func f = (emulation_func)(uintptr_t)*pf;
- f(regs, mcause, mepc, mstatus, insn);
-}
-
-void __attribute__((noinline)) truly_illegal_insn(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc, uintptr_t mstatus, insn_t insn)
-{
- redirect_trap(mepc, mstatus);
-}
-
-void misaligned_load_trap(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc)
-{
- union {
- uint8_t bytes[8];
- uintptr_t intx;
- uint64_t int64;
- } val;
- uintptr_t mstatus;
- insn_t insn = get_insn(mepc, &mstatus);
- uintptr_t addr = GET_RS1(insn, regs) + IMM_I(insn);
-
- int shift = 0, fp = 0, len;
- if ((insn & MASK_LW) == MATCH_LW)
- len = 4, shift = 8*(sizeof(uintptr_t) - len);
-#ifdef __riscv64
- else if ((insn & MASK_LD) == MATCH_LD)
- len = 8, shift = 8*(sizeof(uintptr_t) - len);
- else if ((insn & MASK_LWU) == MATCH_LWU)
- fp = 0, len = 4, shift = 0;
-#endif
- else if ((insn & MASK_FLD) == MATCH_FLD)
- fp = 1, len = 8;
- else if ((insn & MASK_FLW) == MATCH_FLW)
- fp = 1, len = 4;
- else if ((insn & MASK_LH) == MATCH_LH)
- len = 2, shift = 8*(sizeof(uintptr_t) - len);
- else if ((insn & MASK_LHU) == MATCH_LHU)
- len = 2;
- else
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- val.int64 = 0;
- for (intptr_t i = len-1; i >= 0; i--)
- val.bytes[i] = load_uint8_t((void *)(addr + i), mepc);
-
- if (!fp)
- SET_RD(insn, regs, (intptr_t)val.intx << shift >> shift);
- else if (len == 8)
- SET_F64_RD(insn, regs, val.int64);
- else
- SET_F32_RD(insn, regs, val.intx);
-
- write_csr(mepc, mepc + 4);
-}
-
-void misaligned_store_trap(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc)
-{
- union {
- uint8_t bytes[8];
- uintptr_t intx;
- uint64_t int64;
- } val;
- uintptr_t mstatus;
- insn_t insn = get_insn(mepc, &mstatus);
- int len;
-
- val.intx = GET_RS2(insn, regs);
- if ((insn & MASK_SW) == MATCH_SW)
- len = 4;
-#ifdef __riscv64
- else if ((insn & MASK_SD) == MATCH_SD)
- len = 8;
-#endif
- else if ((insn & MASK_FSD) == MATCH_FSD)
- len = 8, val.int64 = GET_F64_RS2(insn, regs);
- else if ((insn & MASK_FSW) == MATCH_FSW)
- len = 4, val.intx = GET_F32_RS2(insn, regs);
- else if ((insn & MASK_SH) == MATCH_SH)
- len = 2;
- else
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- uintptr_t addr = GET_RS1(insn, regs) + IMM_S(insn);
- for (int i = 0; i < len; i++)
- store_uint8_t((void *)(addr + i), val.bytes[i], mepc);
-
- write_csr(mepc, mepc + 4);
-}
-
-#ifdef __riscv64
-typedef __int128 double_int;
-#else
-typedef int64_t double_int;
-#endif
-
-DECLARE_EMULATION_FUNC(emulate_mul_div)
-{
- uintptr_t rs1 = GET_RS1(insn, regs), rs2 = GET_RS2(insn, regs), val;
-
-#ifndef __riscv_muldiv
- // If compiled with -mno-multiply, GCC will expand these out
- if ((insn & MASK_MUL) == MATCH_MUL)
- val = rs1 * rs2;
- else if ((insn & MASK_DIV) == MATCH_DIV)
- val = (intptr_t)rs1 / (intptr_t)rs2;
- else if ((insn & MASK_DIVU) == MATCH_DIVU)
- val = rs1 / rs2;
- else if ((insn & MASK_REM) == MATCH_REM)
- val = (intptr_t)rs1 % (intptr_t)rs2;
- else if ((insn & MASK_REMU) == MATCH_REMU)
- val = rs1 % rs2;
- else if ((insn & MASK_MULH) == MATCH_MULH)
- val = ((double_int)(intptr_t)rs1 * (double_int)(intptr_t)rs2) >> (8 * sizeof(rs1));
- else if ((insn & MASK_MULHU) == MATCH_MULHU)
- val = ((double_int)rs1 * (double_int)rs2) >> (8 * sizeof(rs1));
- else if ((insn & MASK_MULHSU) == MATCH_MULHSU)
- val = ((double_int)(intptr_t)rs1 * (double_int)rs2) >> (8 * sizeof(rs1));
- else
-#endif
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- SET_RD(insn, regs, val);
-}
-
-DECLARE_EMULATION_FUNC(emulate_mul_div32)
-{
- uint32_t rs1 = GET_RS1(insn, regs), rs2 = GET_RS2(insn, regs);
- int32_t val;
-
-#if defined(__riscv64) && !defined(__riscv_muldiv)
- // If compiled with -mno-multiply, GCC will expand these out
- if ((insn & MASK_MULW) == MATCH_MULW)
- val = rs1 * rs2;
- else if ((insn & MASK_DIVW) == MATCH_DIVW)
- val = (int32_t)rs1 / (int32_t)rs2;
- else if ((insn & MASK_DIVUW) == MATCH_DIVUW)
- val = rs1 / rs2;
- else if ((insn & MASK_REMW) == MATCH_REMW)
- val = (int32_t)rs1 % (int32_t)rs2;
- else if ((insn & MASK_REMUW) == MATCH_REMUW)
- val = rs1 % rs2;
- else
-#endif
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- SET_RD(insn, regs, val);
-}
-
-static inline int emulate_read_csr(int num, uintptr_t mstatus, uintptr_t* result)
-{
- switch (num)
- {
- case CSR_TIME:
- *result = read_csr(mtime) + HLS()->utime_delta;
- return 0;
- case CSR_CYCLE:
- *result = read_csr(mcycle) + HLS()->ucycle_delta;
- return 0;
- case CSR_INSTRET:
- *result = read_csr(minstret) + HLS()->uinstret_delta;
- return 0;
- case CSR_STIME:
- *result = read_csr(mtime) + HLS()->stime_delta;
- return 0;
- case CSR_SCYCLE:
- *result = read_csr(mcycle) + HLS()->scycle_delta;
- return 0;
- case CSR_SINSTRET:
- *result = read_csr(minstret) + HLS()->sinstret_delta;
- return 0;
-#ifdef __riscv32
- case CSR_TIMEH:
- *result = (((uint64_t)read_csr(mtimeh) << 32) + read_csr(mtime)
- + HLS()->stime_delta) >> 32;
- return 0;
- case CSR_CYCLEH:
- *result = (((uint64_t)read_csr(mcycleh) << 32) + read_csr(mcycle)
- + HLS()->scycle_delta) >> 32;
- return 0;
- case CSR_INSTRETH:
- *result = (((uint64_t)read_csr(minstreth) << 32) + read_csr(minstret)
- + HLS()->sinstret_delta) >> 32;
- return 0;
-#endif
-#ifdef PK_ENABLE_FP_EMULATION
- case CSR_FRM:
- if ((mstatus & MSTATUS_FS) == 0) break;
- *result = GET_FRM();
- return 0;
- case CSR_FFLAGS:
- if ((mstatus & MSTATUS_FS) == 0) break;
- *result = GET_FFLAGS();
- return 0;
- case CSR_FCSR:
- if ((mstatus & MSTATUS_FS) == 0) break;
- *result = GET_FCSR();
- return 0;
-#endif
- }
- return -1;
-}
-
-static inline int emulate_write_csr(int num, uintptr_t value, uintptr_t mstatus)
-{
- switch (num)
- {
-#ifdef PK_ENABLE_FP_EMULATION
- case CSR_FRM: SET_FRM(value); return 0;
- case CSR_FFLAGS: SET_FFLAGS(value); return 0;
- case CSR_FCSR: SET_FCSR(value); return 0;
-#endif
- }
- return -1;
-}
-
-DECLARE_EMULATION_FUNC(emulate_system)
-{
- int rs1_num = (insn >> 15) & 0x1f;
- uintptr_t rs1_val = GET_RS1(insn, regs);
- int csr_num = (uint32_t)insn >> 20;
- uintptr_t csr_val, new_csr_val;
-
- if (emulate_read_csr(csr_num, mstatus, &csr_val))
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- int do_write = rs1_num;
- switch (GET_RM(insn))
- {
- case 0: return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
- case 1: new_csr_val = rs1_val; do_write = 1; break;
- case 2: new_csr_val = csr_val | rs1_val; break;
- case 3: new_csr_val = csr_val & ~rs1_val; break;
- case 4: return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
- case 5: new_csr_val = rs1_num; do_write = 1; break;
- case 6: new_csr_val = csr_val | rs1_num; break;
- case 7: new_csr_val = csr_val & ~rs1_num; break;
- }
-
- if (do_write && emulate_write_csr(csr_num, new_csr_val, mstatus))
- return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
-
- SET_RD(insn, regs, csr_val);
-}
generated by cgit v1.1 at 2024-09-27 11:30:52 +0000