Hello Alex,
our current logic for removing the handler of the loaded image is wrong:
If a driver image calls Exit() with EFI_SUCCESS the image has to remain.
I tried to rework the logic and needed a second setjmp in cmd/bootefi.c to handle 'bootefi selftest'.
On arm this resulted in:
Building current source for 1 boards (1 thread, 4 jobs per thread) arm: + vexpress_ca15_tc2 +{standard input}: Assembler messages: +{standard input}:638: Error: symbol `jmp_target' is already defined +{standard input}:633: Error: symbol .text.do_bootefi_exec is in a different section +make[2]: *** [cmd/bootefi.o] Error 1 +make[1]: *** [cmd] Error 2 +make: *** [sub-make] Error 2
All registers that have to be restored should be stored in jmp_buf and not at any static address (jmp_target).
Otherwise nesting of setjmp will not work: U-Boot calling an EFI application, which loads another EFI application which exits to the first application which in turn exits to the U-Boot.
Are you able to rework this? Unfortunately I lack the assembler experience. The uClibc implementation might be a good starting point.
Best regards
Heinrich