riscv: entry: Convert to generic entry

This patch converts riscv to use the generic entry infrastructure from kernel/entry/*. The generic entry makes maintainers' work easier and codes more elegant. Here are the changes: - More clear entry.S with handle_exception and ret_from_exception - Get rid of complex custom signal implementation - Move syscall procedure from assembly to C, which is much more readable. - Connect ret_from_fork & ret_from_kernel_thread to generic entry. - Wrap with irqentry_enter/exit and syscall_enter/exit_from_user_mode - Use the standard preemption code instead of custom Suggested-by: Huacai Chen <chenhuacai@kernel.org> Reviewed-by: Björn Töpel <bjorn@rivosinc.com> Tested-by: Yipeng Zou <zouyipeng@huawei.com> Tested-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Cc: Ben Hutchings <ben@decadent.org.uk> Link: https://lore.kernel.org/r/20230222033021.983168-5-guoren@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2026-09-28 19:20:30 +00:00 · 2023-02-21 22:30:18 -05:00 · 2023-02-21 22:30:18 -05:00 · f0bddf5058
commit f0bddf5058
parent d0db02c628
14 changed files with 210 additions and 315 deletions
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
--- a/arch/riscv/include/asm/asm-prototypes.h
+++ b/arch/riscv/include/asm/asm-prototypes.h
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
--- a/arch/riscv/include/asm/entry-common.h
+++ b/arch/riscv/include/asm/entry-common.h
--- a/arch/riscv/include/asm/ptrace.h
+++ b/arch/riscv/include/asm/ptrace.h
--- a/arch/riscv/include/asm/stacktrace.h
+++ b/arch/riscv/include/asm/stacktrace.h
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
--- a/arch/riscv/kernel/head.h
+++ b/arch/riscv/kernel/head.h
--- a/arch/riscv/kernel/ptrace.c
+++ b/arch/riscv/kernel/ptrace.c
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c