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arm: semihosting: Support semihosting fallback on 32-bit ARM

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Add support for a semihosting fallback on 32-bit ARM. The assembly is
lightly adapted from the irq return code, except there is no offset
since lr already points to the correct instruction. The C side is mostly
like ARM64, except we have fewer cases to deal with.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
This commit is contained in:
Sean Anderson
2023-10-27 16:40:15 -04:00
committed by Tom Rini
parent 6ef83ab6be
commit 47cfdb2192
3 changed files with 40 additions and 2 deletions
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4
lib/Kconfig
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@@ -100,7 +100,7 @@ config SEMIHOSTING
config SEMIHOSTING_FALLBACK
bool "Recover gracefully when semihosting fails"
depends on SEMIHOSTING && (ARM64 || RISCV)
depends on SEMIHOSTING
default y
help
Normally, if U-Boot makes a semihosting call and no debugger is
@@ -123,7 +123,7 @@ config SPL_SEMIHOSTING
config SPL_SEMIHOSTING_FALLBACK
bool "Recover gracefully when semihosting fails in SPL"
depends on SPL_SEMIHOSTING && (ARM64 || RISCV)
depends on SPL_SEMIHOSTING
select ARMV8_SPL_EXCEPTION_VECTORS if ARM64
default y
help