Semihosting is a mechanism that enables code running on
a target to communicate and use the Input/Output
facilities on a host computer that is running a debugger.
This patchset adds support for semihosting in u-boot
for RISCV64 targets.
CHANGES since v4:
- Check arch dependencies for SEMIHOSTING as well as SPL_SEMIHOSTING
config options as per Sean's comment.
- arch/riscv/lib/interrupts.c: Check for post and pre instructions
of the ebreak statement whether they are as per the RISCV
semihosting specification. Only then do a disable_semihosting
and epc += 4 and return.
Compilation and test commands for SPL and S-mode configurations
=================================================================
U-Boot S-mode on QEMU virt
----------------------------
// Compilation of S-mode u-boot
ARCH=riscv
CROSS_COMPILE=riscv64-unknown-linux-gnu-
make qemu-riscv64_smode_defconfig
make
// Run riscv 64-bit u-boot with opensbi on qemu
qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -bios\
opensbi/build/platform/generic/firmware/fw_jump.bin -kernel\
u-boot/u-boot.bin
U-Boot SPL on QEMU virt
------------------------
// Compilation of u-boot-spl
ARCH=riscv
CROSS_COMPILE=riscv64-unknown-linux-gnu-
make qemu-riscv64_spl_defconfig
make OPENSBI=opensbi/build/platform/generic/firmware/fw_dynamic.bin
// Run 64-bit u-boot-spl in qemu
qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -bios\
u-boot/spl/u-boot-spl.bin -device\
loader,file=u-boot/u-boot.itb,addr=0x80200000
Kautuk Consul (3):
lib: Add common semihosting library
arch/riscv: add semihosting support for RISC-V
board: qemu-riscv: enable semihosting
arch/arm/Kconfig | 46 -------
arch/arm/lib/semihosting.c | 181 +-------------------------
arch/riscv/include/asm/spl.h | 1 +
arch/riscv/lib/Makefile | 2 +
arch/riscv/lib/interrupts.c | 25 ++++
arch/riscv/lib/semihosting.c | 24 ++++
configs/qemu-riscv32_defconfig | 4 +
configs/qemu-riscv32_smode_defconfig | 4 +
configs/qemu-riscv32_spl_defconfig | 7 +
configs/qemu-riscv64_defconfig | 4 +
configs/qemu-riscv64_smode_defconfig | 4 +
configs/qemu-riscv64_spl_defconfig | 7 +
include/semihosting.h | 11 ++
lib/Kconfig | 47 +++++++
lib/Makefile | 2 +
lib/semihosting.c | 186 +++++++++++++++++++++++++++
16 files changed, 329 insertions(+), 226 deletions(-)
create mode 100644 arch/riscv/lib/semihosting.c
create mode 100644 lib/semihosting.c
--
2.34.1
