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soc: apple: rtkit: Do not copy the reg state structure to the stack 

The register state struct is 848 bytes, which ends up bloating the
apple_rtkit_crashlog_dump_regs stack frame beyond 1024 on some
32-bit platforms, triggering compile warnings.

This doesn't matter for 64BIT/ARM64, but there's also no good reason to
copy the structure to the stack in this case. We can use __packed to
avoid alignment issues, there are no double-read hazards, and this is a
fatal error path so performance does not matter.

Fixes: 22991d8d57 ("soc: apple: rtkit: Add register dump decoding to crashlog")
Signed-off-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Eric Curtin <ecurtin@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Asahi Lina 2023-02-11 18:13:02 +09:00 committed by Arnd Bergmann
parent 68907175ec
commit 4ec98e6db9
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GPG Key ID: 9A6C79EFE60018D9
1 changed files with 13 additions and 13 deletions
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26
drivers/soc/apple/rtkit-crashlog.c
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@ -57,7 +57,7 @@ struct apple_rtkit_crashlog_regs {
u64 unk_X;
u64 esr;
u64 unk_Z;
};
} __packed;
static_assert(sizeof(struct apple_rtkit_crashlog_regs) == 0x350);
static void apple_rtkit_crashlog_dump_str(struct apple_rtkit *rtk, u8 *bfr,
@ -126,18 +126,18 @@ static void apple_rtkit_crashlog_dump_mailbox(struct apple_rtkit *rtk, u8 *bfr,
static void apple_rtkit_crashlog_dump_regs(struct apple_rtkit *rtk, u8 *bfr,
size_t size)
{
struct apple_rtkit_crashlog_regs regs;
struct apple_rtkit_crashlog_regs *regs;
const char *el;
int i;
if (size < sizeof(regs)) {
if (size < sizeof(*regs)) {
dev_warn(rtk->dev, "RTKit: Regs section too small: 0x%zx", size);
return;
}
memcpy(&regs, bfr, sizeof(regs));
regs = (struct apple_rtkit_crashlog_regs *)bfr;
switch (regs.psr & PSR_MODE_MASK) {
switch (regs->psr & PSR_MODE_MASK) {
case PSR_MODE_EL0t:
el = "EL0t";
break;
@ -160,11 +160,11 @@ static void apple_rtkit_crashlog_dump_regs(struct apple_rtkit *rtk, u8 *bfr,
dev_warn(rtk->dev, "RTKit: Exception dump:");
dev_warn(rtk->dev, " == Exception taken from %s ==", el);
dev_warn(rtk->dev, " PSR = 0x%llx", regs.psr);
dev_warn(rtk->dev, " PC = 0x%llx\n", regs.pc);
dev_warn(rtk->dev, " ESR = 0x%llx\n", regs.esr);
dev_warn(rtk->dev, " FAR = 0x%llx\n", regs.far);
dev_warn(rtk->dev, " SP = 0x%llx\n", regs.sp);
dev_warn(rtk->dev, " PSR = 0x%llx", regs->psr);
dev_warn(rtk->dev, " PC = 0x%llx\n", regs->pc);
dev_warn(rtk->dev, " ESR = 0x%llx\n", regs->esr);
dev_warn(rtk->dev, " FAR = 0x%llx\n", regs->far);
dev_warn(rtk->dev, " SP = 0x%llx\n", regs->sp);
dev_warn(rtk->dev, "\n");
for (i = 0; i < 31; i += 4) {
@ -172,12 +172,12 @@ static void apple_rtkit_crashlog_dump_regs(struct apple_rtkit *rtk, u8 *bfr,
dev_warn(rtk->dev,
" x%02d-x%02d = %016llx %016llx %016llx %016llx\n",
i, i + 3,
regs.regs[i], regs.regs[i + 1],
regs.regs[i + 2], regs.regs[i + 3]);
regs->regs[i], regs->regs[i + 1],
regs->regs[i + 2], regs->regs[i + 3]);
else
dev_warn(rtk->dev,
" x%02d-x%02d = %016llx %016llx %016llx\n", i, i + 3,
regs.regs[i], regs.regs[i + 1], regs.regs[i + 2]);
regs->regs[i], regs->regs[i + 1], regs->regs[i + 2]);
}
dev_warn(rtk->dev, "\n");