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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Apple RTKit IPC library
* Copyright (C) The Asahi Linux Contributors
*/
#include "rtkit-internal.h"
#define FOURCC(a, b, c, d) \
(((u32)(a) << 24) | ((u32)(b) << 16) | ((u32)(c) << 8) | ((u32)(d)))
#define APPLE_RTKIT_CRASHLOG_HEADER FOURCC('C', 'L', 'H', 'E')
#define APPLE_RTKIT_CRASHLOG_STR FOURCC('C', 's', 't', 'r')
#define APPLE_RTKIT_CRASHLOG_VERSION FOURCC('C', 'v', 'e', 'r')
#define APPLE_RTKIT_CRASHLOG_MBOX FOURCC('C', 'm', 'b', 'x')
#define APPLE_RTKIT_CRASHLOG_TIME FOURCC('C', 't', 'i', 'm')
#define APPLE_RTKIT_CRASHLOG_REGS FOURCC('C', 'r', 'g', '8')
/* For COMPILE_TEST on non-ARM64 architectures */
#ifndef PSR_MODE_EL0t
#define PSR_MODE_EL0t 0x00000000
#define PSR_MODE_EL1t 0x00000004
#define PSR_MODE_EL1h 0x00000005
#define PSR_MODE_EL2t 0x00000008
#define PSR_MODE_EL2h 0x00000009
#define PSR_MODE_MASK 0x0000000f
#endif
struct apple_rtkit_crashlog_header {
u32 fourcc;
u32 version;
u32 size;
u32 flags;
u8 _unk[16];
};
static_assert(sizeof(struct apple_rtkit_crashlog_header) == 0x20);
struct apple_rtkit_crashlog_mbox_entry {
u64 msg0;
u64 msg1;
u32 timestamp;
u8 _unk[4];
};
static_assert(sizeof(struct apple_rtkit_crashlog_mbox_entry) == 0x18);
struct apple_rtkit_crashlog_regs {
u32 unk_0;
u32 unk_4;
u64 regs[31];
u64 sp;
u64 pc;
u64 psr;
u64 cpacr;
u64 fpsr;
u64 fpcr;
u64 unk[64];
u64 far;
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,
size_t size)
{
u32 idx;
u8 *ptr, *end;
memcpy(&idx, bfr, 4);
ptr = bfr + 4;
end = bfr + size;
while (ptr < end) {
u8 *newline = memchr(ptr, '\n', end - ptr);
if (newline) {
u8 tmp = *newline;
*newline = '\0';
dev_warn(rtk->dev, "RTKit: Message (id=%x): %s\n", idx,
ptr);
*newline = tmp;
ptr = newline + 1;
} else {
dev_warn(rtk->dev, "RTKit: Message (id=%x): %s", idx,
ptr);
break;
}
}
}
static void apple_rtkit_crashlog_dump_version(struct apple_rtkit *rtk, u8 *bfr,
size_t size)
{
dev_warn(rtk->dev, "RTKit: Version: %s", bfr + 16);
}
static void apple_rtkit_crashlog_dump_time(struct apple_rtkit *rtk, u8 *bfr,
size_t size)
{
u64 crash_time;
memcpy(&crash_time, bfr, 8);
dev_warn(rtk->dev, "RTKit: Crash time: %lld", crash_time);
}
static void apple_rtkit_crashlog_dump_mailbox(struct apple_rtkit *rtk, u8 *bfr,
size_t size)
{
u32 type, index, i;
size_t n_messages;
struct apple_rtkit_crashlog_mbox_entry entry;
memcpy(&type, bfr + 16, 4);
memcpy(&index, bfr + 24, 4);
n_messages = (size - 28) / sizeof(entry);
dev_warn(rtk->dev, "RTKit: Mailbox history (type = %d, index = %d)",
type, index);
for (i = 0; i < n_messages; ++i) {
memcpy(&entry, bfr + 28 + i * sizeof(entry), sizeof(entry));
dev_warn(rtk->dev, "RTKit: #%03d@%08x: %016llx %016llx", i,
entry.timestamp, entry.msg0, entry.msg1);
}
}
static void apple_rtkit_crashlog_dump_regs(struct apple_rtkit *rtk, u8 *bfr,
size_t size)
{
struct apple_rtkit_crashlog_regs *regs;
const char *el;
int i;
if (size < sizeof(*regs)) {
dev_warn(rtk->dev, "RTKit: Regs section too small: 0x%zx", size);
return;
}
regs = (struct apple_rtkit_crashlog_regs *)bfr;
switch (regs->psr & PSR_MODE_MASK) {
case PSR_MODE_EL0t:
el = "EL0t";
break;
case PSR_MODE_EL1t:
el = "EL1t";
break;
case PSR_MODE_EL1h:
el = "EL1h";
break;
case PSR_MODE_EL2t:
el = "EL2t";
break;
case PSR_MODE_EL2h:
el = "EL2h";
break;
default:
el = "unknown";
break;
}
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, "\n");
for (i = 0; i < 31; i += 4) {
if (i < 28)
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]);
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]);
}
dev_warn(rtk->dev, "\n");
}
void apple_rtkit_crashlog_dump(struct apple_rtkit *rtk, u8 *bfr, size_t size)
{
size_t offset;
u32 section_fourcc, section_size;
struct apple_rtkit_crashlog_header header;
memcpy(&header, bfr, sizeof(header));
if (header.fourcc != APPLE_RTKIT_CRASHLOG_HEADER) {
dev_warn(rtk->dev, "RTKit: Expected crashlog header but got %x",
header.fourcc);
return;
}
if (header.size > size) {
dev_warn(rtk->dev, "RTKit: Crashlog size (%x) is too large",
header.size);
return;
}
size = header.size;
offset = sizeof(header);
while (offset < size) {
memcpy(§ion_fourcc, bfr + offset, 4);
memcpy(§ion_size, bfr + offset + 12, 4);
switch (section_fourcc) {
case APPLE_RTKIT_CRASHLOG_HEADER:
dev_dbg(rtk->dev, "RTKit: End of crashlog reached");
return;
case APPLE_RTKIT_CRASHLOG_STR:
apple_rtkit_crashlog_dump_str(rtk, bfr + offset + 16,
section_size);
break;
case APPLE_RTKIT_CRASHLOG_VERSION:
apple_rtkit_crashlog_dump_version(
rtk, bfr + offset + 16, section_size);
break;
case APPLE_RTKIT_CRASHLOG_MBOX:
apple_rtkit_crashlog_dump_mailbox(
rtk, bfr + offset + 16, section_size);
break;
case APPLE_RTKIT_CRASHLOG_TIME:
apple_rtkit_crashlog_dump_time(rtk, bfr + offset + 16,
section_size);
break;
case APPLE_RTKIT_CRASHLOG_REGS:
apple_rtkit_crashlog_dump_regs(rtk, bfr + offset + 16,
section_size);
break;
default:
dev_warn(rtk->dev,
"RTKit: Unknown crashlog section: %x",
section_fourcc);
}
offset += section_size;
}
dev_warn(rtk->dev,
"RTKit: End of crashlog reached but no footer present");
}
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