On 4/20/22 15:05, Peter Maydell wrote:
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On Mon, 18 Apr 2022 at 20:15, Leandro Lupori
<leandro.lup...@eldorado.org.br> wrote:
Add semihosting support for PPC64. This implementation is
based on the standard for ARM semihosting version 2.0, as
implemented by QEMU and documented in
https://github.com/ARM-software/abi-aa/releases
The PPC64 specific differences are the following:
Semihosting Trap Instruction: sc 7
Operation Number Register: r3
Parameter Register: r4
Return Register: r3
Data block field size: 64 bits
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
Does the PPC specification for semihosting really follow the
legacy Arm requirement that the 32-bit version of the EXIT
call doesn't let the caller specify the exit status? It's
not a very sensible choice IMHO if you don't have the legacy
baggage to deal with.
As we are actually writing an unofficial PPC specification for
semihosting now, I guess it makes sense to leave the legacy 32-bit
version of EXIT out of it. I'll change this part to always return true.
By the way, this initial implementation supports only 64-bit PPC.
Thanks,
Leandro
-- PMM