diff options
| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2023-10-31 14:55:51 +0200 |
|---|---|---|
| committer | Leo Yu-Chi Liang <ycliang@andestech.com> | 2023-11-02 16:22:06 +0800 |
| commit | 9757cae991669f9a3d2b981b77231ee891d0597d (patch) | |
| tree | b87d518a0708339215a5770457d3a3a3e579dbda /arch/riscv/lib/interrupts.c | |
| parent | b8a902b81462a1fa6bd4fc8614cdc386fa7849d4 (diff) | |
riscv: allow resume after exception
If CSRs like seed are readable by S-mode, may not be determinable by
S-mode. For safe driver probing allow to resume via a longjmp after an
exception.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Diffstat (limited to 'arch/riscv/lib/interrupts.c')
| -rw-r--r-- | arch/riscv/lib/interrupts.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/riscv/lib/interrupts.c b/arch/riscv/lib/interrupts.c index 02dbcfd4238..a26ccc721fd 100644 --- a/arch/riscv/lib/interrupts.c +++ b/arch/riscv/lib/interrupts.c @@ -12,6 +12,7 @@ #include <linux/compat.h> #include <efi_loader.h> #include <hang.h> +#include <interrupt.h> #include <irq_func.h> #include <asm/global_data.h> #include <asm/ptrace.h> @@ -21,6 +22,13 @@ DECLARE_GLOBAL_DATA_PTR; +static struct resume_data *resume; + +void set_resume(struct resume_data *data) +{ + resume = data; +} + static void show_efi_loaded_images(uintptr_t epc) { efi_print_image_infos((void *)epc); @@ -105,6 +113,11 @@ static void _exit_trap(ulong code, ulong epc, ulong tval, struct pt_regs *regs) "Store/AMO page fault", }; + if (resume) { + resume->code = code; + longjmp(resume->jump, 1); + } + if (code < ARRAY_SIZE(exception_code)) printf("Unhandled exception: %s\n", exception_code[code]); else |