Peter Maydell 1c6b0339e6 target/arm: Allow user-mode code to write CPSR.E via MSR ... Using the MSR instruction to write to CPSR.E is deprecated, but it is required to work from any mode including unprivileged code. We were incorrectly forbidding usermode code from writing it because CPSR_USER did not include the CPSR_E bit. We use CPSR_USER in only three places: * as the mask of what to allow userspace MSR to write to CPSR * when deciding what bits a linux-user signal-return should be able to write from the sigcontext structure * in target_user_copy_regs() when we set up the initial registers for the linux-user process In the first two cases not being able to update CPSR.E is a bug, and in the third case it doesn't matter because CPSR.E is always 0 there. So we can fix both bugs by adding CPSR_E to CPSR_USER. Because the cpsr_write() in restore_sigcontext() is now changing a CPSR bit which is cached in hflags, we need to add an arm_rebuild_hflags() call there; the callsite in target_user_copy_regs() was already rebuilding hflags for other reasons. (The recommended way to change CPSR.E is to use the 'SETEND' instruction, which we do correctly allow from usermode code.) Backports commit 268b1b3dfbb92a9348406f728a33f39e3d8dcd8a from qemu		2020-06-14 21:08:03 -04:00
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arm	target/arm: Allow user-mode code to write CPSR.E via MSR	2020-06-14 21:08:03 -04:00
i386	softfloat: Name compare relation enum	2020-05-21 18:08:52 -04:00
m68k	softfloat: Name rounding mode enum	2020-05-21 18:02:05 -04:00
mips	softfloat: Replace flag with bool	2020-05-21 17:48:12 -04:00
riscv	target/riscv: Add a sifive-e34 cpu type	2020-04-30 21:08:10 -04:00
sparc	softfloat: Name compare relation enum	2020-05-21 18:08:52 -04:00