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[panic.serial] Display memory around the user rip

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When displaying a set of user regs, also display memory around the
current rip from those user regs. This helps find or rule out memory
corruption errors causing invalid code to run.
This commit is contained in:
Justin C. Miller
2022-02-12 21:38:44 -08:00
parent 6dea9a4b63
commit dc5efeecbb
1 changed files with 23 additions and 0 deletions
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23
src/kernel/panic.serial/display.cpp
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@@ -113,11 +113,34 @@ print_cpu_state(serial_port &out, const cpu_state &regs)
out.write(clear);
}
static void
print_rip(serial_port &out, uintptr_t addr)
{
constexpr size_t per_line = 16;
addr -= per_line;
uint8_t *data = reinterpret_cast<uint8_t*>(addr);
char bit[100];
out.write("\n");
for (unsigned i = 0; i < per_line*3; i += per_line) {
snprintf(bit, sizeof(bit), "\e[0;33m%20lx: \e[0m", addr + i);
out.write(bit);
for (unsigned j = 0; j < per_line; ++j) {
snprintf(bit, sizeof(bit), "%02x ", data[i+j]);
out.write(bit);
}
out.write("\n");
}
}
void
print_user_state(serial_port &out, const cpu_state &regs)
{
out.write("\n\e[1;35m USER:\e[0 ");
print_cpu_state(out, regs);
print_rip(out, regs.rip);
}
} // namespace panicking