DBT-RISE/DBT-RISE-TGC
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fix trap handling if illegal fetch (PMP) and U-mode CSRs

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This commit is contained in:
Eyck Jentzsch
2021-08-01 17:23:22 +02:00
parent af887c286f
commit d95846a849
4 changed files with 110 additions and 32 deletions
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19
gen_input/templates/interp/CORENAME.cpp.gtl
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@ -296,6 +296,10 @@ inline bool is_count_limit_enabled(finish_cond_e cond){
return (cond & finish_cond_e::COUNT_LIMIT) == finish_cond_e::COUNT_LIMIT;
}
inline bool is_jump_to_self_enabled(finish_cond_e cond){
return (cond & finish_cond_e::JUMP_TO_SELF) == finish_cond_e::JUMP_TO_SELF;
}
template <typename ARCH>
typename vm_impl<ARCH>::compile_func vm_impl<ARCH>::decode_inst(code_word_t instr){
for(auto& e: qlut[instr&0x3]){
@ -307,7 +311,6 @@ typename vm_impl<ARCH>::compile_func vm_impl<ARCH>::decode_inst(code_word_t inst
template <typename ARCH>
typename vm_base<ARCH>::virt_addr_t vm_impl<ARCH>::execute_inst(finish_cond_e cond, virt_addr_t start, uint64_t icount_limit){
// we fetch at max 4 byte, alignment is 2
enum {TRAP_ID=1<<16};
code_word_t insn = 0;
auto *const data = (uint8_t *)&insn;
auto pc=start;
@ -315,14 +318,14 @@ typename vm_base<ARCH>::virt_addr_t vm_impl<ARCH>::execute_inst(finish_cond_e co
!(is_count_limit_enabled(cond) && this->core.get_icount() >= icount_limit)){
auto res = fetch_ins(pc, data);
if(res!=iss::Ok){
auto new_pc = super::core.enter_trap(TRAP_ID, pc.val, 0);
res = fetch_ins(virt_addr_t{access_type::FETCH, new_pc}, data);
if(res!=iss::Ok) throw simulation_stopped(0);
this->do_sync(POST_SYNC, std::numeric_limits<unsigned>::max());
pc.val = super::core.enter_trap(std::numeric_limits<uint64_t>::max(), pc.val, 0);
} else {
if (is_jump_to_self_enabled(cond) &&
(insn == 0x0000006f || (insn&0xffff)==0xa001)) throw simulation_stopped(0); // 'J 0' or 'C.J 0'
auto f = decode_inst(insn);
pc = (this->*f)(pc, insn);
}
if ((cond & finish_cond_e::JUMP_TO_SELF) == finish_cond_e::JUMP_TO_SELF &&
(insn == 0x0000006f || (insn&0xffff)==0xa001)) throw simulation_stopped(0); // 'J 0' or 'C.J 0'
auto f = decode_inst(insn);
pc = (this->*f)(pc, insn);
}
return pc;
}