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linux-user/sh4: Notice gUSA regions during signal delivery 

We translate gUSA regions atomically in a parallel context.
But in a serial context a gUSA region may be interrupted.
In that case, restart the region as the kernel would.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170718200255.31647-9-rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
master
Richard Henderson 2017-07-18 10:02:33 -10:00 committed by Aurelien Jarno
parent d6a6cffdd3
commit b0e4f0edf5
1 changed files with 28 additions and 0 deletions
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28
linux-user/signal.c
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@ -3471,6 +3471,30 @@ static abi_ulong get_sigframe(struct target_sigaction *ka,
return (sp - frame_size) & -8ul;
}
/* Notice when we're in the middle of a gUSA region and reset.
Note that this will only occur for !parallel_cpus, as we will
translate such sequences differently in a parallel context. */
static void unwind_gusa(CPUSH4State *regs)
{
/* If the stack pointer is sufficiently negative, and we haven't
completed the sequence, then reset to the entry to the region. */
/* ??? The SH4 kernel checks for and address above 0xC0000000.
However, the page mappings in qemu linux-user aren't as restricted
and we wind up with the normal stack mapped above 0xF0000000.
That said, there is no reason why the kernel should be allowing
a gUSA region that spans 1GB. Use a tighter check here, for what
can actually be enabled by the immediate move. */
if (regs->gregs[15] >= -128u && regs->pc < regs->gregs[0]) {
/* Reset the PC to before the gUSA region, as computed from
R0 = region end, SP = -(region size), plus one more for the
insn that actually initializes SP to the region size. */
regs->pc = regs->gregs[0] + regs->gregs[15] - 2;
/* Reset the SP to the saved version in R1. */
regs->gregs[15] = regs->gregs[1];
}
}
static void setup_sigcontext(struct target_sigcontext *sc,
CPUSH4State *regs, unsigned long mask)
{
@ -3534,6 +3558,8 @@ static void setup_frame(int sig, struct target_sigaction *ka,
abi_ulong frame_addr;
int i;
unwind_gusa(regs);
frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
trace_user_setup_frame(regs, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
@ -3583,6 +3609,8 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
abi_ulong frame_addr;
int i;
unwind_gusa(regs);
frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
trace_user_setup_rt_frame(regs, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {