lib: Add common semihosting library
We factor out the arch-independent parts of the ARM semihosting
implementation as a common library so that it can be shared
with RISC-V.
Signed-off-by: Kautuk Consul <kconsul@ventanamicro.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index 6abe1d0..b8833e0 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -71,6 +71,53 @@
config LIB_UUID
bool
+config SEMIHOSTING
+ bool "Support semihosting"
+ depends on ARM
+ help
+ Semihosting is a method for a target to communicate with a host
+ debugger. It uses special instructions which the debugger will trap
+ on and interpret. This allows U-Boot to read/write files, print to
+ the console, and execute arbitrary commands on the host system.
+
+ Enabling this option will add support for reading and writing files
+ on the host system. If you don't have a debugger attached then trying
+ to do this will likely cause U-Boot to hang. Say 'n' if you are unsure.
+
+config SEMIHOSTING_FALLBACK
+ bool "Recover gracefully when semihosting fails"
+ depends on SEMIHOSTING && ARM64
+ default y
+ help
+ Normally, if U-Boot makes a semihosting call and no debugger is
+ attached, then it will panic due to a synchronous abort
+ exception. This config adds an exception handler which will allow
+ U-Boot to recover. Say 'y' if unsure.
+
+config SPL_SEMIHOSTING
+ bool "Support semihosting in SPL"
+ depends on SPL && ARM
+ help
+ Semihosting is a method for a target to communicate with a host
+ debugger. It uses special instructions which the debugger will trap
+ on and interpret. This allows U-Boot to read/write files, print to
+ the console, and execute arbitrary commands on the host system.
+
+ Enabling this option will add support for reading and writing files
+ on the host system. If you don't have a debugger attached then trying
+ to do this will likely cause U-Boot to hang. Say 'n' if you are unsure.
+
+config SPL_SEMIHOSTING_FALLBACK
+ bool "Recover gracefully when semihosting fails in SPL"
+ depends on SPL_SEMIHOSTING && ARM64
+ select ARMV8_SPL_EXCEPTION_VECTORS
+ default y
+ help
+ Normally, if U-Boot makes a semihosting call and no debugger is
+ attached, then it will panic due to a synchronous abort
+ exception. This config adds an exception handler which will allow
+ U-Boot to recover. Say 'y' if unsure.
+
config PRINTF
bool
default y