Commits on Sep 3, 2024

1. target/riscv: fix wfi exception behavior …

   The wfi exception trigger behavior should take into account user mode,
   hstatus.vtw, and the fact the an wfi might raise different types of
   exceptions depending on various factors:
   
   If supervisor mode is not present:
   
   - an illegal instruction exception should be generated if user mode
   executes and wfi instruction and mstatus.tw = 1.
   
   If supervisor mode is present:
   
   - when a wfi instruction is executed, an illegal exception should be triggered
   if either the current mode is user or the mode is supervisor and mstatus.tw is
   set.
   
   Plus, if the hypervisor extensions are enabled:
   
   - a virtual instruction exception should be raised when a wfi is executed from
   virtual-user or virtual-supervisor and hstatus.vtw is set.
   
   Signed-off-by: Jose Martins <[email protected]>
   Reviewed-by: Alistair Francis <[email protected]>
   Message-id: [email protected]
   Signed-off-by: Alistair Francis <[email protected]>

   

   josecm authored and apparentlymart committed Sep 3, 2024
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