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qemu-patch-raspberry4/linux-user/ppc/cpu_loop.c
Peter Maydell b10089a14c linux-user: Don't call gdb_handlesig() before queue_signal() 
The CPU main-loop routines for linux-user generally
call gdb_handlesig() when they're about to queue a
SIGTRAP signal. This is wrong, because queue_signal()
will cause us to pend a signal, and process_pending_signals()
will then call gdb_handlesig() itself. So the effect is that
we notify gdb of the SIGTRAP, and then if gdb says "OK,
continue with signal X" we will incorrectly notify
gdb of the signal X as well. We don't do this double-notify
for anything else, only SIGTRAP.

Remove this unnecessary and incorrect code from all
the targets except for nios2 (whose main loop is
doing something different and broken, and will be handled
in a separate patch).

This bug only manifests if the user responds to the reported
SIGTRAP using "signal SIGFOO" rather than "continue"; since
the latter is the overwhelmingly common thing to do after a
breakpoint most people won't have hit this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20181019174958.26616-2-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2018-11-12 15:48:00 +01:00

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/*
* qemu user cpu loop
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
#include "cpu_loop-common.h"
static inline uint64_t cpu_ppc_get_tb(CPUPPCState *env)
{
return cpu_get_host_ticks();
}
uint64_t cpu_ppc_load_tbl(CPUPPCState *env)
{
return cpu_ppc_get_tb(env);
}
uint32_t cpu_ppc_load_tbu(CPUPPCState *env)
{
return cpu_ppc_get_tb(env) >> 32;
}
uint64_t cpu_ppc_load_atbl(CPUPPCState *env)
{
return cpu_ppc_get_tb(env);
}
uint32_t cpu_ppc_load_atbu(CPUPPCState *env)
{
return cpu_ppc_get_tb(env) >> 32;
}
uint32_t cpu_ppc601_load_rtcu(CPUPPCState *env)
__attribute__ (( alias ("cpu_ppc_load_tbu") ));
uint32_t cpu_ppc601_load_rtcl(CPUPPCState *env)
{
return cpu_ppc_load_tbl(env) & 0x3FFFFF80;
}
/* XXX: to be fixed */
int ppc_dcr_read (ppc_dcr_t *dcr_env, int dcrn, uint32_t *valp)
{
return -1;
}
int ppc_dcr_write (ppc_dcr_t *dcr_env, int dcrn, uint32_t val)
{
return -1;
}
void cpu_loop(CPUPPCState *env)
{
CPUState *cs = CPU(ppc_env_get_cpu(env));
target_siginfo_t info;
int trapnr;
target_ulong ret;
for(;;) {
bool arch_interrupt;
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
arch_interrupt = true;
switch (trapnr) {
case POWERPC_EXCP_NONE:
/* Just go on */
break;
case POWERPC_EXCP_CRITICAL: /* Critical input */
cpu_abort(cs, "Critical interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_MCHECK: /* Machine check exception */
cpu_abort(cs, "Machine check exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
/* XXX: check this. Seems bugged */
switch (env->error_code & 0xFF000000) {
case 0x40000000:
case 0x42000000:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_MAPERR;
break;
case 0x04000000:
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_ILLADR;
break;
case 0x08000000:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_ACCERR;
break;
default:
/* Let's send a regular segfault... */
EXCP_DUMP(env, "Invalid segfault errno (%02x)\n",
env->error_code);
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_MAPERR;
break;
}
info._sifields._sigfault._addr = env->spr[SPR_DAR];
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_ISI: /* Instruction storage exception */
/* XXX: check this */
switch (env->error_code & 0xFF000000) {
case 0x40000000:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_MAPERR;
break;
case 0x10000000:
case 0x08000000:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_ACCERR;
break;
default:
/* Let's send a regular segfault... */
EXCP_DUMP(env, "Invalid segfault errno (%02x)\n",
env->error_code);
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_MAPERR;
break;
}
info._sifields._sigfault._addr = env->nip - 4;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_EXTERNAL: /* External input */
cpu_abort(cs, "External interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_ALIGN: /* Alignment exception */
/* XXX: check this */
info.si_signo = TARGET_SIGBUS;
info.si_errno = 0;
info.si_code = TARGET_BUS_ADRALN;
info._sifields._sigfault._addr = env->nip;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_PROGRAM: /* Program exception */
case POWERPC_EXCP_HV_EMU: /* HV emulation */
/* XXX: check this */
switch (env->error_code & ~0xF) {
case POWERPC_EXCP_FP:
info.si_signo = TARGET_SIGFPE;
info.si_errno = 0;
switch (env->error_code & 0xF) {
case POWERPC_EXCP_FP_OX:
info.si_code = TARGET_FPE_FLTOVF;
break;
case POWERPC_EXCP_FP_UX:
info.si_code = TARGET_FPE_FLTUND;
break;
case POWERPC_EXCP_FP_ZX:
case POWERPC_EXCP_FP_VXZDZ:
info.si_code = TARGET_FPE_FLTDIV;
break;
case POWERPC_EXCP_FP_XX:
info.si_code = TARGET_FPE_FLTRES;
break;
case POWERPC_EXCP_FP_VXSOFT:
info.si_code = TARGET_FPE_FLTINV;
break;
case POWERPC_EXCP_FP_VXSNAN:
case POWERPC_EXCP_FP_VXISI:
case POWERPC_EXCP_FP_VXIDI:
case POWERPC_EXCP_FP_VXIMZ:
case POWERPC_EXCP_FP_VXVC:
case POWERPC_EXCP_FP_VXSQRT:
case POWERPC_EXCP_FP_VXCVI:
info.si_code = TARGET_FPE_FLTSUB;
break;
default:
EXCP_DUMP(env, "Unknown floating point exception (%02x)\n",
env->error_code);
break;
}
break;
case POWERPC_EXCP_INVAL:
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
switch (env->error_code & 0xF) {
case POWERPC_EXCP_INVAL_INVAL:
info.si_code = TARGET_ILL_ILLOPC;
break;
case POWERPC_EXCP_INVAL_LSWX:
info.si_code = TARGET_ILL_ILLOPN;
break;
case POWERPC_EXCP_INVAL_SPR:
info.si_code = TARGET_ILL_PRVREG;
break;
case POWERPC_EXCP_INVAL_FP:
info.si_code = TARGET_ILL_COPROC;
break;
default:
EXCP_DUMP(env, "Unknown invalid operation (%02x)\n",
env->error_code & 0xF);
info.si_code = TARGET_ILL_ILLADR;
break;
}
break;
case POWERPC_EXCP_PRIV:
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
switch (env->error_code & 0xF) {
case POWERPC_EXCP_PRIV_OPC:
info.si_code = TARGET_ILL_PRVOPC;
break;
case POWERPC_EXCP_PRIV_REG:
info.si_code = TARGET_ILL_PRVREG;
break;
default:
EXCP_DUMP(env, "Unknown privilege violation (%02x)\n",
env->error_code & 0xF);
info.si_code = TARGET_ILL_PRVOPC;
break;
}
break;
case POWERPC_EXCP_TRAP:
cpu_abort(cs, "Tried to call a TRAP\n");
break;
default:
/* Should not happen ! */
cpu_abort(cs, "Unknown program exception (%02x)\n",
env->error_code);
break;
}
info._sifields._sigfault._addr = env->nip;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_FPU: /* Floating-point unavailable exception */
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_COPROC;
info._sifields._sigfault._addr = env->nip;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_SYSCALL: /* System call exception */
cpu_abort(cs, "Syscall exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_APU: /* Auxiliary processor unavailable */
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_COPROC;
info._sifields._sigfault._addr = env->nip;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_DECR: /* Decrementer exception */
cpu_abort(cs, "Decrementer interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_FIT: /* Fixed-interval timer interrupt */
cpu_abort(cs, "Fix interval timer interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_WDT: /* Watchdog timer interrupt */
cpu_abort(cs, "Watchdog timer interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_DTLB: /* Data TLB error */
cpu_abort(cs, "Data TLB exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_ITLB: /* Instruction TLB error */
cpu_abort(cs, "Instruction TLB exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_SPEU: /* SPE/embedded floating-point unavail. */
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_COPROC;
info._sifields._sigfault._addr = env->nip;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_EFPDI: /* Embedded floating-point data IRQ */
cpu_abort(cs, "Embedded floating-point data IRQ not handled\n");
break;
case POWERPC_EXCP_EFPRI: /* Embedded floating-point round IRQ */
cpu_abort(cs, "Embedded floating-point round IRQ not handled\n");
break;
case POWERPC_EXCP_EPERFM: /* Embedded performance monitor IRQ */
cpu_abort(cs, "Performance monitor exception not handled\n");
break;
case POWERPC_EXCP_DOORI: /* Embedded doorbell interrupt */
cpu_abort(cs, "Doorbell interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_DOORCI: /* Embedded doorbell critical interrupt */
cpu_abort(cs, "Doorbell critical interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_RESET: /* System reset exception */
cpu_abort(cs, "Reset interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_DSEG: /* Data segment exception */
cpu_abort(cs, "Data segment exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_ISEG: /* Instruction segment exception */
cpu_abort(cs, "Instruction segment exception "
"while in user mode. Aborting\n");
break;
/* PowerPC 64 with hypervisor mode support */
case POWERPC_EXCP_HDECR: /* Hypervisor decrementer exception */
cpu_abort(cs, "Hypervisor decrementer interrupt "
"while in user mode. Aborting\n");
break;
case POWERPC_EXCP_TRACE: /* Trace exception */
/* Nothing to do:
* we use this exception to emulate step-by-step execution mode.
*/
break;
/* PowerPC 64 with hypervisor mode support */
case POWERPC_EXCP_HDSI: /* Hypervisor data storage exception */
cpu_abort(cs, "Hypervisor data storage exception "
"while in user mode. Aborting\n");
break;
case POWERPC_EXCP_HISI: /* Hypervisor instruction storage excp */
cpu_abort(cs, "Hypervisor instruction storage exception "
"while in user mode. Aborting\n");
break;
case POWERPC_EXCP_HDSEG: /* Hypervisor data segment exception */
cpu_abort(cs, "Hypervisor data segment exception "
"while in user mode. Aborting\n");
break;
case POWERPC_EXCP_HISEG: /* Hypervisor instruction segment excp */
cpu_abort(cs, "Hypervisor instruction segment exception "
"while in user mode. Aborting\n");
break;
case POWERPC_EXCP_VPU: /* Vector unavailable exception */
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_COPROC;
info._sifields._sigfault._addr = env->nip;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case POWERPC_EXCP_PIT: /* Programmable interval timer IRQ */
cpu_abort(cs, "Programmable interval timer interrupt "
"while in user mode. Aborting\n");
break;
case POWERPC_EXCP_IO: /* IO error exception */
cpu_abort(cs, "IO error exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_RUNM: /* Run mode exception */
cpu_abort(cs, "Run mode exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_EMUL: /* Emulation trap exception */
cpu_abort(cs, "Emulation trap exception not handled\n");
break;
case POWERPC_EXCP_IFTLB: /* Instruction fetch TLB error */
cpu_abort(cs, "Instruction fetch TLB exception "
"while in user-mode. Aborting");
break;
case POWERPC_EXCP_DLTLB: /* Data load TLB miss */
cpu_abort(cs, "Data load TLB exception while in user-mode. "
"Aborting");
break;
case POWERPC_EXCP_DSTLB: /* Data store TLB miss */
cpu_abort(cs, "Data store TLB exception while in user-mode. "
"Aborting");
break;
case POWERPC_EXCP_FPA: /* Floating-point assist exception */
cpu_abort(cs, "Floating-point assist exception not handled\n");
break;
case POWERPC_EXCP_IABR: /* Instruction address breakpoint */
cpu_abort(cs, "Instruction address breakpoint exception "
"not handled\n");
break;
case POWERPC_EXCP_SMI: /* System management interrupt */
cpu_abort(cs, "System management interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_THERM: /* Thermal interrupt */
cpu_abort(cs, "Thermal interrupt interrupt while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_PERFM: /* Embedded performance monitor IRQ */
cpu_abort(cs, "Performance monitor exception not handled\n");
break;
case POWERPC_EXCP_VPUA: /* Vector assist exception */
cpu_abort(cs, "Vector assist exception not handled\n");
break;
case POWERPC_EXCP_SOFTP: /* Soft patch exception */
cpu_abort(cs, "Soft patch exception not handled\n");
break;
case POWERPC_EXCP_MAINT: /* Maintenance exception */
cpu_abort(cs, "Maintenance exception while in user mode. "
"Aborting\n");
break;
case POWERPC_EXCP_STOP: /* stop translation */
/* We did invalidate the instruction cache. Go on */
break;
case POWERPC_EXCP_BRANCH: /* branch instruction: */
/* We just stopped because of a branch. Go on */
break;
case POWERPC_EXCP_SYSCALL_USER:
/* system call in user-mode emulation */
/* WARNING:
* PPC ABI uses overflow flag in cr0 to signal an error
* in syscalls.
*/
env->crf[0] &= ~0x1;
env->nip += 4;
ret = do_syscall(env, env->gpr[0], env->gpr[3], env->gpr[4],
env->gpr[5], env->gpr[6], env->gpr[7],
env->gpr[8], 0, 0);
if (ret == -TARGET_ERESTARTSYS) {
env->nip -= 4;
break;
}
if (ret == (target_ulong)(-TARGET_QEMU_ESIGRETURN)) {
/* Returning from a successful sigreturn syscall.
Avoid corrupting register state. */
break;
}
if (ret > (target_ulong)(-515)) {
env->crf[0] |= 0x1;
ret = -ret;
}
env->gpr[3] = ret;
break;
case EXCP_DEBUG:
info.si_signo = TARGET_SIGTRAP;
info.si_errno = 0;
info.si_code = TARGET_TRAP_BRKPT;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
arch_interrupt = false;
break;
default:
cpu_abort(cs, "Unknown exception 0x%x. Aborting\n", trapnr);
break;
}
process_pending_signals(env);
/* Most of the traps imply a transition through kernel mode,
* which implies an REI instruction has been executed. Which
* means that RX and LOCK_ADDR should be cleared. But there
* are a few exceptions for traps internal to QEMU.
*/
if (arch_interrupt) {
env->reserve_addr = -1;
}
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
int i;
#if defined(TARGET_PPC64)
int flag = (env->insns_flags2 & PPC2_BOOKE206) ? MSR_CM : MSR_SF;
#if defined(TARGET_ABI32)
env->msr &= ~((target_ulong)1 << flag);
#else
env->msr |= (target_ulong)1 << flag;
#endif
#endif
env->nip = regs->nip;
for(i = 0; i < 32; i++) {
env->gpr[i] = regs->gpr[i];
}
}
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