Commit 5d5c5d0f authored by Rui Qi's avatar Rui Qi Committed by Paul Walmsley
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riscv: add hardware error trap handler support 



Add support for handling hardware error traps (exception code 19)
in the RISC-V architecture. The changes include:

- Add do_trap_hardware_error function declaration in asm-prototypes.h
- Add hardware error trap vector entry in entry.S exception vector table
- Implement do_trap_hardware_error handler in traps.c that generates
  SIGBUS with BUS_MCEERR_AR for hardware errors

This enables proper handling of hardware error exceptions that may occur
in RISC-V systems, providing appropriate error reporting and signal
generation for user space processes.

Signed-off-by: default avatarRui Qi <qirui.001@bytedance.com>
Link: https://patch.msgid.link/20260202094200.53735-1-qirui.001@bytedance.com


[pjw@kernel.org: clean up commit message slightly]
Signed-off-by: default avatarPaul Walmsley <pjw@kernel.org>
parent 580e626d

arch/riscv/include/asm/asm-prototypes.h

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ asmlinkage void riscv_v_context_nesting_end(struct pt_regs *regs); 
#define DECLARE_DO_ERROR_INFO(name)	asmlinkage void name(struct pt_regs *regs)



DECLARE_DO_ERROR_INFO(do_trap_unknown);

DECLARE_DO_ERROR_INFO(do_trap_hardware_error);

DECLARE_DO_ERROR_INFO(do_trap_insn_misaligned);

DECLARE_DO_ERROR_INFO(do_trap_insn_fault);

DECLARE_DO_ERROR_INFO(do_trap_insn_illegal);

arch/riscv/kernel/entry.S

+1 −0
Original line number Diff line number Diff line
@@ -498,6 +498,7 @@ SYM_DATA_START_LOCAL(excp_vect_table) 
	RISCV_PTR do_trap_unknown /* cause=16 */

	RISCV_PTR do_trap_unknown /* cause=17 */

	RISCV_PTR do_trap_software_check /* cause=18 is sw check exception */

	RISCV_PTR do_trap_hardware_error /* hardware error (19) */

SYM_DATA_END_LABEL(excp_vect_table, SYM_L_LOCAL, excp_vect_table_end)



#ifndef CONFIG_MMU

arch/riscv/kernel/traps.c

+2 −0
Original line number Diff line number Diff line
@@ -165,6 +165,8 @@ asmlinkage __visible __trap_section void name(struct pt_regs *regs) \ 


DO_ERROR_INFO(do_trap_unknown,

	SIGILL, ILL_ILLTRP, "unknown exception");

DO_ERROR_INFO(do_trap_hardware_error,

	SIGBUS, BUS_MCEERR_AR, "hardware error");

DO_ERROR_INFO(do_trap_insn_misaligned,

	SIGBUS, BUS_ADRALN, "instruction address misaligned");

DO_ERROR_INFO(do_trap_insn_fault,