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nios2: Add usermode binaries emulation

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Add missing bits for qemu-user required for emulating Altera Nios2
userspace binaries.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chris Wulff <crwulff@gmail.com>
Cc: Jeff Da Silva <jdasilva@altera.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Sandra Loosemore <sandra@codesourcery.com>
Cc: Yves Vandervennet <yvanderv@altera.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Message-Id: <20170118220146.489-4-marex@denx.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Marek Vasut 2017-01-18 23:01:42 +01:00 • committed by Richard Henderson
parent 3f0c342309
commit a0a839b65b
11 changed files with 1148 additions and 7 deletions
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140
linux-user/main.c
View file

@ -68,8 +68,11 @@ do { \
* This way we will never overlap with our own libraries or binaries or stack
* or anything else that QEMU maps.
*/
# ifdef TARGET_MIPS
/* MIPS only supports 31 bits of virtual address space for user space */
# if defined(TARGET_MIPS) || defined(TARGET_NIOS2)
/*
* MIPS only supports 31 bits of virtual address space for user space.
* Nios2 also only supports 31 bits.
*/
unsigned long reserved_va = 0x77000000;
# else
unsigned long reserved_va = 0xf7000000;
@ -2462,6 +2465,109 @@ error:
}
#endif
#ifdef TARGET_NIOS2
void cpu_loop(CPUNios2State *env)
{
CPUState *cs = ENV_GET_CPU(env);
Nios2CPU *cpu = NIOS2_CPU(cs);
target_siginfo_t info;
int trapnr, gdbsig, ret;
for (;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
gdbsig = 0;
switch (trapnr) {
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_TRAP:
if (env->regs[R_AT] == 0) {
abi_long ret;
qemu_log_mask(CPU_LOG_INT, "\nSyscall\n");
ret = do_syscall(env, env->regs[2],
env->regs[4], env->regs[5], env->regs[6],
env->regs[7], env->regs[8], env->regs[9],
0, 0);
if (env->regs[2] == 0) { /* FIXME: syscall 0 workaround */
ret = 0;
}
env->regs[2] = abs(ret);
/* Return value is 0..4096 */
env->regs[7] = (ret > 0xfffffffffffff000ULL);
env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
env->regs[CR_STATUS] &= ~0x3;
env->regs[R_EA] = env->regs[R_PC] + 4;
env->regs[R_PC] += 4;
break;
} else {
qemu_log_mask(CPU_LOG_INT, "\nTrap\n");
env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
env->regs[CR_STATUS] &= ~0x3;
env->regs[R_EA] = env->regs[R_PC] + 4;
env->regs[R_PC] = cpu->exception_addr;
gdbsig = TARGET_SIGTRAP;
break;
}
case 0xaa:
switch (env->regs[R_PC]) {
/*case 0x1000:*/ /* TODO:__kuser_helper_version */
case 0x1004: /* __kuser_cmpxchg */
start_exclusive();
if (env->regs[4] & 0x3) {
goto kuser_fail;
}
ret = get_user_u32(env->regs[2], env->regs[4]);
if (ret) {
end_exclusive();
goto kuser_fail;
}
env->regs[2] -= env->regs[5];
if (env->regs[2] == 0) {
put_user_u32(env->regs[6], env->regs[4]);
}
end_exclusive();
env->regs[R_PC] = env->regs[R_RA];
break;
/*case 0x1040:*/ /* TODO:__kuser_sigtramp */
default:
;
kuser_fail:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
/* TODO: check env->error_code */
info.si_code = TARGET_SEGV_MAPERR;
info._sifields._sigfault._addr = env->regs[R_PC];
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
}
break;
default:
EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
trapnr);
gdbsig = TARGET_SIGILL;
break;
}
if (gdbsig) {
gdb_handlesig(cs, gdbsig);
if (gdbsig != TARGET_SIGTRAP) {
exit(EXIT_FAILURE);
}
}
process_pending_signals(env);
}
}
#endif /* TARGET_NIOS2 */
#ifdef TARGET_OPENRISC
void cpu_loop(CPUOpenRISCState *env)
@ -4632,6 +4738,36 @@ int main(int argc, char **argv, char **envp)
restore_snan_bit_mode(env);
}
}
#elif defined(TARGET_NIOS2)
{
env->regs[0] = 0;
env->regs[1] = regs->r1;
env->regs[2] = regs->r2;
env->regs[3] = regs->r3;
env->regs[4] = regs->r4;
env->regs[5] = regs->r5;
env->regs[6] = regs->r6;
env->regs[7] = regs->r7;
env->regs[8] = regs->r8;
env->regs[9] = regs->r9;
env->regs[10] = regs->r10;
env->regs[11] = regs->r11;
env->regs[12] = regs->r12;
env->regs[13] = regs->r13;
env->regs[14] = regs->r14;
env->regs[15] = regs->r15;
/* TODO: unsigned long orig_r2; */
env->regs[R_RA] = regs->ra;
env->regs[R_FP] = regs->fp;
env->regs[R_SP] = regs->sp;
env->regs[R_GP] = regs->gp;
env->regs[CR_ESTATUS] = regs->estatus;
env->regs[R_EA] = regs->ea;
/* TODO: unsigned long orig_r7; */
/* Emulate eret when starting thread. */
env->regs[R_PC] = regs->ea;
}
#elif defined(TARGET_OPENRISC)
{
int i;