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arm-trusted-firmware/bl31/aarch64/crash_reporting.S
Govindraj Raja f300ef6628 refactor(aarch64): remove weak links to el3_panic 
Cleanup weak links to el3_panic and restrict crash_reporting usage
to bl31.

Crash reporting is not used with bl1, bl2 and weak linkage to el3_panic
is used, this can cause ambiguity in understanding the code so remove
this weak linkage and introduce funcs that should be used when we have
crash reporting for el3 panics.

Change-Id: Ic5c711143ba36898ef9574a078b8fa02effceb12
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
2023-02-21 17:26:01 +00:00

469 lines
13 KiB
ArmAsm
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/*
* Copyright (c) 2014-2023, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <plat_macros.S>
#include <platform_def.h>
#include <arch.h>
#include <asm_macros.S>
#include <context.h>
#include <lib/el3_runtime/cpu_data.h>
#include <lib/utils_def.h>
.globl report_unhandled_exception
.globl report_unhandled_interrupt
.globl report_el3_panic
.globl report_elx_panic
#if CRASH_REPORTING
/* ------------------------------------------------------
* The below section deals with dumping the system state
* when an unhandled exception is taken in EL3.
* The layout and the names of the registers which will
* be dumped during a unhandled exception is given below.
* ------------------------------------------------------
*/
.section .rodata.crash_prints, "aS"
print_spacer:
.asciz " = 0x"
gp_regs:
.asciz "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",\
"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",\
"x16", "x17", "x18", "x19", "x20", "x21", "x22",\
"x23", "x24", "x25", "x26", "x27", "x28", "x29", ""
el3_sys_regs:
.asciz "scr_el3", "sctlr_el3", "cptr_el3", "tcr_el3",\
"daif", "mair_el3", "spsr_el3", "elr_el3", "ttbr0_el3",\
"esr_el3", "far_el3", ""
non_el3_sys_regs:
.asciz "spsr_el1", "elr_el1", "spsr_abt", "spsr_und",\
"spsr_irq", "spsr_fiq", "sctlr_el1", "actlr_el1", "cpacr_el1",\
"csselr_el1", "sp_el1", "esr_el1", "ttbr0_el1", "ttbr1_el1",\
"mair_el1", "amair_el1", "tcr_el1", "tpidr_el1", "tpidr_el0",\
"tpidrro_el0", "par_el1", "mpidr_el1", "afsr0_el1", "afsr1_el1",\
"contextidr_el1", "vbar_el1", "cntp_ctl_el0", "cntp_cval_el0",\
"cntv_ctl_el0", "cntv_cval_el0", "cntkctl_el1", "sp_el0", "isr_el1", ""
#if CTX_INCLUDE_AARCH32_REGS
aarch32_regs:
.asciz "dacr32_el2", "ifsr32_el2", ""
#endif /* CTX_INCLUDE_AARCH32_REGS */
panic_msg:
.asciz "PANIC in EL3.\nx30"
excpt_msg:
.asciz "Unhandled Exception in EL3.\nx30"
intr_excpt_msg:
.ascii "Unhandled Interrupt Exception in EL3.\n"
x30_msg:
.asciz "x30"
excpt_msg_el:
.asciz "Unhandled Exception from lower EL.\n"
/*
* Helper function to print from crash buf.
* The print loop is controlled by the buf size and
* ascii reg name list which is passed in x6. The
* function returns the crash buf address in x0.
* Clobbers : x0 - x7, sp
*/
func size_controlled_print
/* Save the lr */
mov sp, x30
/* load the crash buf address */
mrs x7, tpidr_el3
test_size_list:
/* Calculate x5 always as it will be clobbered by asm_print_hex */
mrs x5, tpidr_el3
add x5, x5, #CPU_DATA_CRASH_BUF_SIZE
/* Test whether we have reached end of crash buf */
cmp x7, x5
b.eq exit_size_print
ldrb w4, [x6]
/* Test whether we are at end of list */
cbz w4, exit_size_print
mov x4, x6
/* asm_print_str updates x4 to point to next entry in list */
bl asm_print_str
/* x0 = number of symbols printed + 1 */
sub x0, x4, x6
/* update x6 with the updated list pointer */
mov x6, x4
bl print_alignment
ldr x4, [x7], #REGSZ
bl asm_print_hex
bl asm_print_newline
b test_size_list
exit_size_print:
mov x30, sp
ret
endfunc size_controlled_print
/* -----------------------------------------------------
* This function calculates and prints required number
* of space characters followed by "= 0x", based on the
* length of ascii register name.
* x0: length of ascii register name + 1
* ------------------------------------------------------
*/
func print_alignment
/* The minimum ascii length is 3, e.g. for "x0" */
adr x4, print_spacer - 3
add x4, x4, x0
b asm_print_str
endfunc print_alignment
/*
* Helper function to store x8 - x15 registers to
* the crash buf. The system registers values are
* copied to x8 to x15 by the caller which are then
* copied to the crash buf by this function.
* x0 points to the crash buf. It then calls
* size_controlled_print to print to console.
* Clobbers : x0 - x7, sp
*/
func str_in_crash_buf_print
/* restore the crash buf address in x0 */
mrs x0, tpidr_el3
stp x8, x9, [x0]
stp x10, x11, [x0, #REGSZ * 2]
stp x12, x13, [x0, #REGSZ * 4]
stp x14, x15, [x0, #REGSZ * 6]
b size_controlled_print
endfunc str_in_crash_buf_print
/* ------------------------------------------------------
* This macro calculates the offset to crash buf from
* cpu_data and stores it in tpidr_el3. It also saves x0
* and x1 in the crash buf by using sp as a temporary
* register.
* ------------------------------------------------------
*/
.macro prepare_crash_buf_save_x0_x1
/* we can corrupt this reg to free up x0 */
mov sp, x0
/* tpidr_el3 contains the address to cpu_data structure */
mrs x0, tpidr_el3
/* Calculate the Crash buffer offset in cpu_data */
add x0, x0, #CPU_DATA_CRASH_BUF_OFFSET
/* Store crash buffer address in tpidr_el3 */
msr tpidr_el3, x0
str x1, [x0, #REGSZ]
mov x1, sp
str x1, [x0]
.endm
/* -----------------------------------------------------
* This function allows to report a crash (if crash
* reporting is enabled) when an unhandled exception
* occurs. It prints the CPU state via the crash console
* making use of the crash buf. This function will
* not return.
* -----------------------------------------------------
*/
func report_unhandled_exception
prepare_crash_buf_save_x0_x1
adr x0, excpt_msg
mov sp, x0
/* This call will not return */
b do_crash_reporting
endfunc report_unhandled_exception
/* -----------------------------------------------------
* This function allows to report a crash (if crash
* reporting is enabled) when an unhandled interrupt
* occurs. It prints the CPU state via the crash console
* making use of the crash buf. This function will
* not return.
* -----------------------------------------------------
*/
func report_unhandled_interrupt
prepare_crash_buf_save_x0_x1
adr x0, intr_excpt_msg
mov sp, x0
/* This call will not return */
b do_crash_reporting
endfunc report_unhandled_interrupt
/* -----------------------------------------------------
* This function allows to report a crash from the lower
* exception level (if crash reporting is enabled) when
* lower_el_panic() is invoked from C Runtime.
* It prints the CPU state via the crash console making
* use of 'cpu_context' structure where general purpose
* registers are saved and the crash buf.
* This function will not return.
* -----------------------------------------------------
*/
func report_elx_panic
msr spsel, #MODE_SP_ELX
/* Print the crash message */
adr x4, excpt_msg_el
bl asm_print_str
/* Report x0 - x29 values stored in 'gpregs_ctx' structure */
/* Store the ascii list pointer in x6 */
adr x6, gp_regs
add x7, sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0
print_next:
ldrb w4, [x6]
/* Test whether we are at end of list */
cbz w4, print_x30
mov x4, x6
/* asm_print_str updates x4 to point to next entry in list */
bl asm_print_str
/* x0 = number of symbols printed + 1 */
sub x0, x4, x6
/* Update x6 with the updated list pointer */
mov x6, x4
bl print_alignment
ldr x4, [x7], #REGSZ
bl asm_print_hex
bl asm_print_newline
b print_next
print_x30:
adr x4, x30_msg
bl asm_print_str
/* Print spaces to align "x30" string */
mov x0, #4
bl print_alignment
/* Report x30 */
ldr x4, [x7]
/* ----------------------------------------------------------------
* Different virtual address space size can be defined for each EL.
* Ensure that we use the proper one by reading the corresponding
* TCR_ELx register.
* ----------------------------------------------------------------
*/
cmp x8, #MODE_EL2
b.lt from_el1 /* EL1 */
mrs x2, sctlr_el2
mrs x1, tcr_el2
/* ----------------------------------------------------------------
* Check if pointer authentication is enabled at the specified EL.
* If it isn't, we can then skip stripping a PAC code.
* ----------------------------------------------------------------
*/
test_pauth:
tst x2, #(SCTLR_EnIA_BIT | SCTLR_EnIB_BIT)
b.eq no_pauth
/* Demangle address */
and x1, x1, #0x3F /* T0SZ = TCR_ELx[5:0] */
sub x1, x1, #64
neg x1, x1 /* bottom_pac_bit = 64 - T0SZ */
mov x2, #-1
lsl x2, x2, x1
bic x4, x4, x2
no_pauth:
bl asm_print_hex
bl asm_print_newline
/* tpidr_el3 contains the address to cpu_data structure */
mrs x0, tpidr_el3
/* Calculate the Crash buffer offset in cpu_data */
add x0, x0, #CPU_DATA_CRASH_BUF_OFFSET
/* Store crash buffer address in tpidr_el3 */
msr tpidr_el3, x0
/* Print the rest of crash dump */
b print_el3_sys_regs
from_el1:
mrs x2, sctlr_el1
mrs x1, tcr_el1
b test_pauth
endfunc report_elx_panic
/* -----------------------------------------------------
* This function allows to report a crash (if crash
* reporting is enabled) when panic() is invoked from
* C Runtime. It prints the CPU state via the crash
* console making use of the crash buf. This function
* will not return.
* -----------------------------------------------------
*/
func report_el3_panic
msr spsel, #MODE_SP_ELX
prepare_crash_buf_save_x0_x1
adr x0, panic_msg
mov sp, x0
/* Fall through to 'do_crash_reporting' */
/* ------------------------------------------------------------
* The common crash reporting functionality. It requires x0
* and x1 has already been stored in crash buf, sp points to
* crash message and tpidr_el3 contains the crash buf address.
* The function does the following:
* - Retrieve the crash buffer from tpidr_el3
* - Store x2 to x6 in the crash buffer
* - Initialise the crash console.
* - Print the crash message by using the address in sp.
* - Print x30 value to the crash console.
* - Print x0 - x7 from the crash buf to the crash console.
* - Print x8 - x29 (in groups of 8 registers) using the
* crash buf to the crash console.
* - Print el3 sys regs (in groups of 8 registers) using the
* crash buf to the crash console.
* - Print non el3 sys regs (in groups of 8 registers) using
* the crash buf to the crash console.
* ------------------------------------------------------------
*/
do_crash_reporting:
/* Retrieve the crash buf from tpidr_el3 */
mrs x0, tpidr_el3
/* Store x2 - x6, x30 in the crash buffer */
stp x2, x3, [x0, #REGSZ * 2]
stp x4, x5, [x0, #REGSZ * 4]
stp x6, x30, [x0, #REGSZ * 6]
/* Initialize the crash console */
bl plat_crash_console_init
/* Verify the console is initialized */
cbz x0, crash_panic
/* Print the crash message. sp points to the crash message */
mov x4, sp
bl asm_print_str
/* Print spaces to align "x30" string */
mov x0, #4
bl print_alignment
/* Load the crash buf address */
mrs x0, tpidr_el3
/* Report x30 first from the crash buf */
ldr x4, [x0, #REGSZ * 7]
#if ENABLE_PAUTH
/* Demangle address */
xpaci x4
#endif
bl asm_print_hex
bl asm_print_newline
/* Load the crash buf address */
mrs x0, tpidr_el3
/* Now mov x7 into crash buf */
str x7, [x0, #REGSZ * 7]
/* Report x0 - x29 values stored in crash buf */
/* Store the ascii list pointer in x6 */
adr x6, gp_regs
/* Print x0 to x7 from the crash buf */
bl size_controlled_print
/* Store x8 - x15 in crash buf and print */
bl str_in_crash_buf_print
/* Load the crash buf address */
mrs x0, tpidr_el3
/* Store the rest of gp regs and print */
stp x16, x17, [x0]
stp x18, x19, [x0, #REGSZ * 2]
stp x20, x21, [x0, #REGSZ * 4]
stp x22, x23, [x0, #REGSZ * 6]
bl size_controlled_print
/* Load the crash buf address */
mrs x0, tpidr_el3
stp x24, x25, [x0]
stp x26, x27, [x0, #REGSZ * 2]
stp x28, x29, [x0, #REGSZ * 4]
bl size_controlled_print
/* Print the el3 sys registers */
print_el3_sys_regs:
adr x6, el3_sys_regs
mrs x8, scr_el3
mrs x9, sctlr_el3
mrs x10, cptr_el3
mrs x11, tcr_el3
mrs x12, daif
mrs x13, mair_el3
mrs x14, spsr_el3
mrs x15, elr_el3
bl str_in_crash_buf_print
mrs x8, ttbr0_el3
mrs x9, esr_el3
mrs x10, far_el3
bl str_in_crash_buf_print
/* Print the non el3 sys registers */
adr x6, non_el3_sys_regs
mrs x8, spsr_el1
mrs x9, elr_el1
mrs x10, spsr_abt
mrs x11, spsr_und
mrs x12, spsr_irq
mrs x13, spsr_fiq
mrs x14, sctlr_el1
mrs x15, actlr_el1
bl str_in_crash_buf_print
mrs x8, cpacr_el1
mrs x9, csselr_el1
mrs x10, sp_el1
mrs x11, esr_el1
mrs x12, ttbr0_el1
mrs x13, ttbr1_el1
mrs x14, mair_el1
mrs x15, amair_el1
bl str_in_crash_buf_print
mrs x8, tcr_el1
mrs x9, tpidr_el1
mrs x10, tpidr_el0
mrs x11, tpidrro_el0
mrs x12, par_el1
mrs x13, mpidr_el1
mrs x14, afsr0_el1
mrs x15, afsr1_el1
bl str_in_crash_buf_print
mrs x8, contextidr_el1
mrs x9, vbar_el1
mrs x10, cntp_ctl_el0
mrs x11, cntp_cval_el0
mrs x12, cntv_ctl_el0
mrs x13, cntv_cval_el0
mrs x14, cntkctl_el1
mrs x15, sp_el0
bl str_in_crash_buf_print
mrs x8, isr_el1
bl str_in_crash_buf_print
#if CTX_INCLUDE_AARCH32_REGS
/* Print the AArch32 registers */
adr x6, aarch32_regs
mrs x8, dacr32_el2
mrs x9, ifsr32_el2
bl str_in_crash_buf_print
#endif /* CTX_INCLUDE_AARCH32_REGS */
/* Get the cpu specific registers to report */
bl do_cpu_reg_dump
bl str_in_crash_buf_print
/* Print some platform registers */
plat_crash_print_regs
bl plat_crash_console_flush
/* Done reporting */
no_ret plat_panic_handler
endfunc report_el3_panic
#else /* CRASH_REPORTING */
func report_unhandled_exception
report_unhandled_interrupt:
no_ret plat_panic_handler
endfunc report_unhandled_exception
#endif /* CRASH_REPORTING */
func crash_panic
no_ret plat_panic_handler
endfunc crash_panic
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