RAS: Move EA handling to a separate file
A new file ea_delegate.S is introduced, and all EA-related functions are
moved into it. This makes runtime_exceptions.S less crowded and reads
better.
No functional changes.
Change-Id: I64b653b3931984cffd420563f8e8d1ba263f329f
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/bl31/aarch64/runtime_exceptions.S b/bl31/aarch64/runtime_exceptions.S
index 12f9f10..ff77597 100644
--- a/bl31/aarch64/runtime_exceptions.S
+++ b/bl31/aarch64/runtime_exceptions.S
@@ -66,9 +66,7 @@
/* Save GP registers and restore them afterwards */
bl save_gp_registers
- mov x0, #ERROR_EA_ESB
- mrs x1, DISR_EL1
- bl delegate_ea
+ bl handle_lower_el_ea_esb
bl restore_gp_registers
1:
@@ -80,27 +78,6 @@
#endif
.endm
- /*
- * Handle External Abort by delegating to the platform's EA handler.
- * Once the platform handler returns, the macro exits EL3 and returns to
- * where the abort was taken from.
- *
- * This macro assumes that x30 is available for use.
- *
- * 'abort_type' is a constant passed to the platform handler, indicating
- * the cause of the External Abort.
- */
- .macro handle_ea abort_type
- /* Save GP registers */
- bl save_gp_registers
-
- /* Setup exception class and syndrome arguments for platform handler */
- mov x0, \abort_type
- mrs x1, esr_el3
- adr x30, el3_exit
- b delegate_ea
- .endm
-
/* ---------------------------------------------------------------------
* This macro handles Synchronous exceptions.
* Only SMC exceptions are supported.
@@ -130,23 +107,9 @@
cmp x30, #EC_AARCH64_SMC
b.eq smc_handler64
- /* Check for I/D aborts from lower EL */
- cmp x30, #EC_IABORT_LOWER_EL
- b.eq 1f
-
- cmp x30, #EC_DABORT_LOWER_EL
- b.ne 2f
-
-1:
- /* Test for EA bit in the instruction syndrome */
- mrs x30, esr_el3
- tbz x30, #ESR_ISS_EABORT_EA_BIT, 2f
- handle_ea #ERROR_EA_SYNC
-
-2:
- /* Other kinds of synchronous exceptions are not handled */
+ /* Synchronous exceptions other than the above are assumed to be EA */
ldr x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
- b report_unhandled_exception
+ b enter_lower_el_sync_ea
.endm
@@ -306,13 +269,7 @@
vector_entry serror_aarch64
msr daifclr, #DAIF_ABT_BIT
-
- /*
- * Explicitly save x30 so as to free up a register and to enable
- * branching
- */
- str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
- handle_ea #ERROR_EA_ASYNC
+ b enter_lower_el_async_ea
end_vector_entry serror_aarch64
/* ---------------------------------------------------------------------
@@ -342,13 +299,7 @@
vector_entry serror_aarch32
msr daifclr, #DAIF_ABT_BIT
-
- /*
- * Explicitly save x30 so as to free up a register and to enable
- * branching
- */
- str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
- handle_ea #ERROR_EA_ASYNC
+ b enter_lower_el_async_ea
end_vector_entry serror_aarch32
@@ -525,62 +476,3 @@
msr spsel, #1
no_ret report_unhandled_exception
endfunc smc_handler
-
-/*
- * Delegate External Abort handling to platform's EA handler. This function
- * assumes that all GP registers have been saved by the caller.
- *
- * x0: EA reason
- * x1: EA syndrome
- */
-func delegate_ea
- /* Save EL3 state */
- mrs x2, spsr_el3
- mrs x3, elr_el3
- stp x2, x3, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
-
- /*
- * Save ESR as handling might involve lower ELs, and returning back to
- * EL3 from there would trample the original ESR.
- */
- mrs x4, scr_el3
- mrs x5, esr_el3
- stp x4, x5, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
-
- /*
- * Setup rest of arguments, and call platform External Abort handler.
- *
- * x0: EA reason (already in place)
- * x1: Exception syndrome (already in place).
- * x2: Cookie (unused for now).
- * x3: Context pointer.
- * x4: Flags (security state from SCR for now).
- */
- mov x2, xzr
- mov x3, sp
- ubfx x4, x4, #0, #1
-
- /* Switch to runtime stack */
- ldr x5, [sp, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP]
- msr spsel, #0
- mov sp, x5
-
- mov x29, x30
- bl plat_ea_handler
- mov x30, x29
-
- /* Make SP point to context */
- msr spsel, #1
-
- /* Restore EL3 state */
- ldp x1, x2, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
- msr spsr_el3, x1
- msr elr_el3, x2
-
- /* Restore ESR_EL3 and SCR_EL3 */
- ldp x3, x4, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
- msr scr_el3, x3
- msr esr_el3, x4
-
- ret
-endfunc delegate_ea