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| author | Justin Chadwell <justin.chadwell@arm.com> | 2019-08-20 11:01:52 +0100 |
|---|---|---|
| committer | Justin Chadwell <justin.chadwell@arm.com> | 2019-09-11 14:15:54 +0100 |
| commit | 1f4619796af5baf4b41b5723bbf708355f8597fa (patch) | |
| tree | 0c1293905f4c922c53a1b2f8ea999f9da65f9841 /bl31 | |
| parent | 5dbdf8e4eac1d5999f07976f9f430894b0784907 (diff) | |
Add UBSAN support and handlers
This patch adds support for the Undefined Behaviour sanitizer. There are
two types of support offered - minimalistic trapping support which
essentially immediately crashes on undefined behaviour and full support
with full debug messages.
The full support relies on ubsan.c which has been adapted from code used
by OPTEE.
Change-Id: I417c810f4fc43dcb56db6a6a555bfd0b38440727
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
Diffstat (limited to 'bl31')
| -rw-r--r-- | bl31/aarch64/runtime_exceptions.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/bl31/aarch64/runtime_exceptions.S b/bl31/aarch64/runtime_exceptions.S index fd7656e2..1cbec8fd 100644 --- a/bl31/aarch64/runtime_exceptions.S +++ b/bl31/aarch64/runtime_exceptions.S @@ -220,6 +220,19 @@ vector_base runtime_exceptions * --------------------------------------------------------------------- */ vector_entry sync_exception_sp_el0 +#ifdef MONITOR_TRAPS + stp x29, x30, [sp, #-16]! + + mrs x30, esr_el3 + ubfx x30, x30, #ESR_EC_SHIFT, #ESR_EC_LENGTH + + /* Check for BRK */ + cmp x30, #EC_BRK + b.eq brk_handler + + ldp x29, x30, [sp], #16 +#endif /* MONITOR_TRAPS */ + /* We don't expect any synchronous exceptions from EL3 */ b report_unhandled_exception end_vector_entry sync_exception_sp_el0 @@ -328,6 +341,14 @@ vector_entry serror_aarch32 b enter_lower_el_async_ea end_vector_entry serror_aarch32 +#ifdef MONITOR_TRAPS + .section .rodata.brk_string, "aS" +brk_location: + .asciz "Error at instruction 0x" +brk_message: + .asciz "Unexpected BRK instruction with value 0x" +#endif /* MONITOR_TRAPS */ + /* --------------------------------------------------------------------- * The following code handles secure monitor calls. * Depending upon the execution state from where the SMC has been @@ -455,3 +476,39 @@ rt_svc_fw_critical_error: msr spsel, #1 no_ret report_unhandled_exception endfunc smc_handler + + /* --------------------------------------------------------------------- + * The following code handles exceptions caused by BRK instructions. + * Following a BRK instruction, the only real valid cause of action is + * to print some information and panic, as the code that caused it is + * likely in an inconsistent internal state. + * + * This is initially intended to be used in conjunction with + * __builtin_trap. + * --------------------------------------------------------------------- + */ +#ifdef MONITOR_TRAPS +func brk_handler + /* Extract the ISS */ + mrs x10, esr_el3 + ubfx x10, x10, #ESR_ISS_SHIFT, #ESR_ISS_LENGTH + + /* Ensure the console is initialized */ + bl plat_crash_console_init + + adr x4, brk_location + bl asm_print_str + mrs x4, elr_el3 + bl asm_print_hex + bl asm_print_newline + + adr x4, brk_message + bl asm_print_str + mov x4, x10 + mov x5, #28 + bl asm_print_hex_bits + bl asm_print_newline + + no_ret plat_panic_handler +endfunc brk_handler +#endif /* MONITOR_TRAPS */ |