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// See LICENSE for license details.
#include "emulation.h"
#include "fp_emulation.h"
#include "unprivileged_memory.h"
#include "mtrap.h"
#include "config.h"
#include "pk.h"
union byte_array {
uint8_t bytes[8];
uintptr_t intx;
uint32_t int32;
uint64_t int64;
};
void misaligned_load_trap(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc)
{
union byte_array val;
uintptr_t mstatus;
insn_t insn = get_insn(mepc, &mstatus);
uintptr_t npc = mepc + insn_len(insn);
uintptr_t addr = read_csr(mtval);
int shift = 0, fp = 0, len;
if ((insn & MASK_LW) == MATCH_LW)
len = 4, shift = 8*(sizeof(uintptr_t) - len);
#if __riscv_xlen == 64
else if ((insn & MASK_LD) == MATCH_LD)
len = 8, shift = 8*(sizeof(uintptr_t) - len);
else if ((insn & MASK_LWU) == MATCH_LWU)
len = 4;
#endif
#ifdef PK_ENABLE_FP_EMULATION
else if ((insn & MASK_FLD) == MATCH_FLD)
fp = 1, len = 8;
else if ((insn & MASK_FLW) == MATCH_FLW)
fp = 1, len = 4;
#endif
else if ((insn & MASK_LH) == MATCH_LH)
len = 2, shift = 8*(sizeof(uintptr_t) - len);
else if ((insn & MASK_LHU) == MATCH_LHU)
len = 2;
#ifdef __riscv_compressed
# if __riscv_xlen >= 64
else if ((insn & MASK_C_LD) == MATCH_C_LD)
len = 8, shift = 8*(sizeof(uintptr_t) - len), insn = RVC_RS2S(insn) << SH_RD;
else if ((insn & MASK_C_LDSP) == MATCH_C_LDSP && ((insn >> SH_RD) & 0x1f))
len = 8, shift = 8*(sizeof(uintptr_t) - len);
# endif
else if ((insn & MASK_C_LW) == MATCH_C_LW)
len = 4, shift = 8*(sizeof(uintptr_t) - len), insn = RVC_RS2S(insn) << SH_RD;
else if ((insn & MASK_C_LWSP) == MATCH_C_LWSP && ((insn >> SH_RD) & 0x1f))
len = 4, shift = 8*(sizeof(uintptr_t) - len);
# ifdef PK_ENABLE_FP_EMULATION
else if ((insn & MASK_C_FLD) == MATCH_C_FLD)
fp = 1, len = 8, insn = RVC_RS2S(insn) << SH_RD;
else if ((insn & MASK_C_FLDSP) == MATCH_C_FLDSP)
fp = 1, len = 8;
# if __riscv_xlen == 32
else if ((insn & MASK_C_FLW) == MATCH_C_FLW)
fp = 1, len = 4, insn = RVC_RS2S(insn) << SH_RD;
else if ((insn & MASK_C_FLWSP) == MATCH_C_FLWSP)
fp = 1, len = 4;
# endif
# endif
#endif
else {
mcause = CAUSE_LOAD_ACCESS;
write_csr(mcause, mcause);
return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
}
val.int64 = 0;
for (intptr_t i = 0; i < len; i++)
val.bytes[i] = load_uint8_t((void *)(addr + i), mepc);
if (!fp)
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
SET_RD(insn, regs, (intptr_t)val.intx << shift >> shift);
#else
SET_RD(insn, regs, (intptr_t)val.intx >> shift);
#endif
else if (len == 8)
SET_F64_RD(insn, regs, val.int64);
else
SET_F32_RD(insn, regs, val.int32);
write_csr(mepc, npc);
}
void misaligned_store_trap(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc)
{
union byte_array val;
uintptr_t mstatus;
insn_t insn = get_insn(mepc, &mstatus);
uintptr_t npc = mepc + insn_len(insn);
int len;
val.intx = GET_RS2(insn, regs);
if ((insn & MASK_SW) == MATCH_SW)
len = 4;
#if __riscv_xlen == 64
else if ((insn & MASK_SD) == MATCH_SD)
len = 8;
#endif
#ifdef PK_ENABLE_FP_EMULATION
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);
#endif
else if ((insn & MASK_SH) == MATCH_SH)
len = 2;
#ifdef __riscv_compressed
# if __riscv_xlen >= 64
else if ((insn & MASK_C_SD) == MATCH_C_SD)
len = 8, val.intx = GET_RS2S(insn, regs);
else if ((insn & MASK_C_SDSP) == MATCH_C_SDSP)
len = 8, val.intx = GET_RS2C(insn, regs);
# endif
else if ((insn & MASK_C_SW) == MATCH_C_SW)
len = 4, val.intx = GET_RS2S(insn, regs);
else if ((insn & MASK_C_SWSP) == MATCH_C_SWSP)
len = 4, val.intx = GET_RS2C(insn, regs);
# ifdef PK_ENABLE_FP_EMULATION
else if ((insn & MASK_C_FSD) == MATCH_C_FSD)
len = 8, val.int64 = GET_F64_RS2S(insn, regs);
else if ((insn & MASK_C_FSDSP) == MATCH_C_FSDSP)
len = 8, val.int64 = GET_F64_RS2C(insn, regs);
# if __riscv_xlen == 32
else if ((insn & MASK_C_FSW) == MATCH_C_FSW)
len = 4, val.intx = GET_F32_RS2S(insn, regs);
else if ((insn & MASK_C_FSWSP) == MATCH_C_FSWSP)
len = 4, val.intx = GET_F32_RS2C(insn, regs);
# endif
# endif
#endif
else {
mcause = CAUSE_STORE_ACCESS;
write_csr(mcause, mcause);
return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
}
uintptr_t addr = read_csr(mtval);
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
intptr_t offs = (len == 8? 0 : sizeof(val.intx) - len);
#else
intptr_t offs = 0;
#endif
for (int i = 0; i < len; i++)
store_uint8_t((void *)(addr + i), val.bytes[offs + i], mepc);
write_csr(mepc, npc);
}
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