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riscv: allow resume after exception

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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>
This commit is contained in:
Heinrich Schuchardt
2023-10-31 14:55:51 +02:00
committed by Leo Yu-Chi Liang
parent b8a902b814
commit 9757cae991
4 changed files with 65 additions and 0 deletions
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13
arch/riscv/lib/interrupts.c
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@@ -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