WebFeb 10, 2024 · On Wed, 26 Jan 2024 09:14:42 PST (-0800), [email protected] wrote: > From version 2.38, binutils default to ISA spec version 20241213. This. > means that the csr read/write (csrr*/csrw*) instructions and fence.i. > instruction has separated from the `I` extension, become two standalone. WebFeb 1, 2024 · Thx for sharing, you saved my (teaching) day. A small fix for those that are not QEMU natives : add the -bios none option to QEMU command line to avoid the "qemu-system-riscv64: Some ROM regions are overlapping" message (may depend upon your qemu configuration) , i.e.: qemu-system-riscv64 -machine virt -device VGA -smp 1 -bios …
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WebNov 5, 2024 · The first register is the mtvec register, which stands for Machine Trap Vector. A vector is a function pointer. ... # 0b01 11: Machine's previous protection mode is 2 (MPP=2). li t0, 0b11 . 11 csrw mstatus, t0 … WebOptional vectored interrupt support has been added to the mtvec and stvec CSRs. The SEIP and UEIP bits in the mip CSR have been rede ned to support software injection of external interrupts. The mbadaddr register has been subsumed by a more general mtval register that can now shower head humming sound
assembly weak symbol not working as (I) expected
Webcsrw mstatus, t0: #ifdef STARTUP_ENABLE_HPE /* Enable PFIC HPE and nesting */ li t0, 0x3: #else /* Only enable nesting, not HPE */ li t0, 0x2: ... by 4) */ la t0, _start: ori t0, t0, 3: csrw mtvec, t0: #ifdef STARTUP_CALL_SYSINIT: jal SystemInit: #endif /* Execute main by setting it as address to be returned to, then return */ la t0, main: csrw ... Webla t0, (_ottf_interrupt_vector + 1) csrw mtvec, t0 /** * Setup C Runtime */ /** * Initialize the `.data` section in RAM from Flash. */ la a0, _data_start: la a1, _data_end: la a2, _data_init_start: call crt_section_copy /** * Initialize the `.bss` section. * * We do this despite zeroing all of SRAM above, so that we still zero `.bss` WebJan 9, 2024 · 26. mtvec Machine Trap-Vector Base-Address Register (mtvec) do_reset: // 途中略 # write mtvec and make sure it sticks la t0, trap_vector csrw mtvec, t0 csrr t1, mtvec 1:bne t0, t1, 1b 27. trap_vector machine/mentry.S trap_vector: csrrw sp, mscratch, sp beqz sp, .Ltrap_from_machine_mode STORE a0, 10*REGBYTES(sp) STORE a1, … shower head injector