RISC-V Design · All levels
Page Fault Handling, Trap Flow, and Recovery Paths: Software and Programmer View
Software and Programmer View for Page Fault Handling, Trap Flow, and Recovery Paths.
Software and programmer view
Software and Programmer View for Page Fault Handling, Trap Flow, and Recovery Paths is anchored on Fault service latency (median/P99), restart success rate, and throughput impact during demand paging and copy-on-write stress.. Convert observations into mechanism-backed decisions with explicit ownership.
Keep ISA profile, ABI, and extension assumptions explicit.
Validate runtime feature detection against hardware contract.
Correlate compiler output with microarchitectural counters.
Preserve deterministic trap and privilege behavior in all modes.
Decode contract
diagram
DECODE CONTROL MAP - Page Fault Handling, Trap Flow, and Recovery Paths
opcode/funct3/funct7 controls asserted
----------------------- ---------------------------------------
LUI / AUIPC rd_write, imm_select(U), alu_add_pc
JAL / JALR rd_write, pc_redirect, link_write
BRANCH cmp_enable, branch_type, pc_redirect
LOAD mem_read, rd_write, wb_sel(memory)
STORE mem_write, store_size, addr_calc
OP-IMM alu_enable, imm_select(I), rd_write
OP alu_enable, src2_reg, rd_write
SYSTEM / CSR csr_readwrite, trap_check, privilege_gate
VECTOR (V extension) vdecode, lane_mask, vtype_update