diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index 3d18d1b3ee..d68bd26013 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -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) { @@ -3525,6 +3549,7 @@ static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc) __get_user(regs->fpul, &sc->sc_fpul); regs->tra = -1; /* disable syscall checks */ + regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK); } static void setup_frame(int sig, struct target_sigaction *ka, @@ -3534,6 +3559,8 @@ 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)) { @@ -3566,6 +3593,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, regs->gregs[5] = 0; regs->gregs[6] = frame_addr += offsetof(typeof(*frame), sc); regs->pc = (unsigned long) ka->_sa_handler; + regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK); unlock_user_struct(frame, frame_addr, 1); return; @@ -3583,6 +3611,8 @@ 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)) { @@ -3626,6 +3656,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, regs->gregs[5] = frame_addr + offsetof(typeof(*frame), info); regs->gregs[6] = frame_addr + offsetof(typeof(*frame), uc); regs->pc = (unsigned long) ka->_sa_handler; + regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK); unlock_user_struct(frame, frame_addr, 1); return; |