[kvm-unit-tests v4 08/12] powerpc: Expand exception handler vector granularity
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2023-06-08 08:06:21
Also in:
kvm
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Exception handlers are currently indexed in units of 0x100, but powerpc can have vectors that are aligned to as little as 0x20 bytes. Increase granularity of the handler functions before adding support for those vectors. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- Since v3: - Fix typo [Thomas] lib/powerpc/processor.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/lib/powerpc/processor.c b/lib/powerpc/processor.c
index aaf45b68..64d7ae01 100644
--- a/lib/powerpc/processor.c
+++ b/lib/powerpc/processor.c@@ -16,19 +16,25 @@ static struct { void (*func)(struct pt_regs *, void *data); void *data; -} handlers[16]; +} handlers[128]; +/* + * Exception handlers span from 0x100 to 0x1000 and can have a granularity + * of 0x20 bytes in some cases. Indexing spans 0-0x1000 with 0x20 increments + * resulting in 128 slots. + */ void handle_exception(int trap, void (*func)(struct pt_regs *, void *), void * data) { - assert(!(trap & ~0xf00)); + assert(!(trap & ~0xfe0)); - trap >>= 8; + trap >>= 5; if (func && handlers[trap].func) { printf("exception handler installed twice %#x\n", trap); abort(); } + handlers[trap].func = func; handlers[trap].data = data; }
@@ -37,9 +43,9 @@ void do_handle_exception(struct pt_regs *regs) { unsigned char v; - v = regs->trap >> 8; + v = regs->trap >> 5; - if (v < 16 && handlers[v].func) { + if (v < 128 && handlers[v].func) { handlers[v].func(regs, handlers[v].data); return; }
--
2.40.1