riscv

For x86 and x64 compilers generate similar zero/sign extend MOVSX and MOVZX. The expansion itself is not free, but allows processors to perform out-of-order magic speed up. But on RISC-V: Consequently, conversion between unsigned and signed 32-bit integers is a no-op, as is conversion from a signed 32-bit integer to a signed 64-bit integer. A few new instructions (ADD[I]W/SUBW/SxxW) are required for addition and shifts to ensure reasonable performance for 32-bit values. (C) RISC-V Spec But at the same time, the new modern RISC-V 64-bit processors contains instructions for 32-bit signed

I've set up a hello world program just for testing my riscv32-unknown-elf toolchain, spike , pk etc. Though I managed to get the hello world printed using spike --isa=RV32 pk hello.elf , I found out that if I added the -d flag for debugging, I was given following instructions (a section of the whole): core 0: 0x0000000000001000 (0x7ffff297) auipc t0, 0x7ffff : core 0: 0x0000000000001004 (0x00028067) jr t0 : core 0: 0xffffffff80000000 (0x1b00006f) j pc + 0x1b0 : core 0: 0xffffffff800001b0 (0x00000093) li ra, 0 : core 0: 0xffffffff800001b4 (0x00000113) li sp, 0 : core 0: 0xffffffff800001b8

According to the riscv-gcc compiler we are generated the binary file. This binary file data are feeding to rocket chip through this signals. io_host_in_valid, input [15:0] io_host_in_bits Here io_host_in_bits is 16-bit, so we are driving the 2-times for each instruction data in little-Endian mode. We are not getting any response from Rocket core (HTIF). How to simulate the Rocket core and if it is possible to simulate in Xilinx Vivado 2014 as well as debug the design. Can any one help me about this Regards, Santhosh Kumar. For more information on the Rocket Chip infrastructure, I recommend

I'm having trouble debugging a simple program running in QEMU with GDB. GDB seems unable to find where I am in the program (in that it always displays ?? as my current location), and it never hits any breakpoint I set. In one terminal, I run QEMU: $ cat add.c int main() { int x = 9; int v = 1; while (1) { int q = x + v; } return 0; } $ riscv64-unknown-elf-gcc add.c -g $ qemu-system-riscv64 -gdb tcp::1234 -drive file=a.out,format=raw And in another terminal, I run GDB: $ riscv64-unknown-elf-gdb a.out GNU gdb (GDB) 8.2.90.20190228-git Copyright (C) 2019 Free Software Foundation, Inc. License

I have the following simple C code: void main(){ int A = 333; int B=244; int sum; sum = A + B; } When I compile this with $riscv64-unknown-elf-gcc code.c -o code.o If I want to see the assembly code I use $riscv64-unknown-elf-objdump -d code.o But when I explore the assembly code I see that this generates a lot of code which I assume is for Proxy Kernel support (I am a newbie to riscv). However, I do not want that this code has support for Proxy kernel, because the idea is to implement only this simple C code within an FPGA. I read that riscv provides three types of compilation: Bare-metal

I want to port the rocket chip to a non-Zynq FPGA (an altera Stratix V), a board which doesn't contain an ARM core used to run the riscv-fesvr. How can I go about starting the port? Also, has anyone attempted to run the rocket chip on such a board? Can I pointed to some resources for that? This is mainly an issue of interfacing, as Rocket Chip does not use anything Zynq specific internally. If this interfacing is done properly, you should not need to change pk/linux or Rocket Chip itself. You will need to both wrap Rocket Chip for the target FPGA and interface to it with a Frontend Server