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ARM: Add minimal ARM_SE support for m5threads.

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Updated some of the assembly code sequences to use armv7 instructions and
coprocessor 15 for storing the TLS pointer.
This commit is contained in:
Chris Emmons 2011-03-17 19:20:20 -05:00
parent 53ab306acc
commit ccaaa98b49
3 changed files with 36 additions and 14 deletions
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34
src/arch/arm/linux/process.cc
View file

@ -197,7 +197,7 @@ SyscallDesc ArmLinuxProcess::syscallDescs[] = {
/* 117 */ SyscallDesc("ipc", unimplementedFunc),
/* 118 */ SyscallDesc("fsync", unimplementedFunc),
/* 119 */ SyscallDesc("sigreturn", unimplementedFunc),
/* 120 */ SyscallDesc("clone", unimplementedFunc),
/* 120 */ SyscallDesc("clone", cloneFunc),
/* 121 */ SyscallDesc("setdomainname", unimplementedFunc),
/* 122 */ SyscallDesc("uname", unameFunc),
/* 123 */ SyscallDesc("unused#123", unimplementedFunc),
@ -239,7 +239,7 @@ SyscallDesc ArmLinuxProcess::syscallDescs[] = {
/* 159 */ SyscallDesc("sched_get_priority_max", unimplementedFunc),
/* 160 */ SyscallDesc("sched_get_priority_min", unimplementedFunc),
/* 161 */ SyscallDesc("sched_rr_get_interval", unimplementedFunc),
/* 162 */ SyscallDesc("nanosleep", unimplementedFunc),
/* 162 */ SyscallDesc("nanosleep", ignoreWarnOnceFunc),
/* 163 */ SyscallDesc("mremap", mremapFunc<ArmLinux>), // ARM-specific
/* 164 */ SyscallDesc("setresuid", unimplementedFunc),
/* 165 */ SyscallDesc("getresuid", unimplementedFunc),
@ -251,8 +251,8 @@ SyscallDesc ArmLinuxProcess::syscallDescs[] = {
/* 171 */ SyscallDesc("getresgid", unimplementedFunc),
/* 172 */ SyscallDesc("prctl", unimplementedFunc),
/* 173 */ SyscallDesc("rt_sigreturn", unimplementedFunc),
/* 174 */ SyscallDesc("rt_sigaction", ignoreFunc),
/* 175 */ SyscallDesc("rt_sigprocmask", unimplementedFunc),
/* 174 */ SyscallDesc("rt_sigaction", ignoreWarnOnceFunc),
/* 175 */ SyscallDesc("rt_sigprocmask", ignoreWarnOnceFunc),
/* 176 */ SyscallDesc("rt_sigpending", unimplementedFunc),
/* 177 */ SyscallDesc("rt_sigtimedwait", unimplementedFunc),
/* 178 */ SyscallDesc("rt_sigqueueinfo", ignoreFunc),
@ -317,7 +317,7 @@ SyscallDesc ArmLinuxProcess::syscallDescs[] = {
/* 237 */ SyscallDesc("fremovexattr", unimplementedFunc),
/* 238 */ SyscallDesc("tkill", unimplementedFunc),
/* 239 */ SyscallDesc("sendfile64", unimplementedFunc),
/* 240 */ SyscallDesc("futex", unimplementedFunc),
/* 240 */ SyscallDesc("futex", ignoreWarnOnceFunc),
/* 241 */ SyscallDesc("sched_setaffinity", unimplementedFunc),
/* 242 */ SyscallDesc("sched_getaffinity", unimplementedFunc),
/* 243 */ SyscallDesc("io_setup", unimplementedFunc),
@ -456,6 +456,7 @@ setTLSFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
tc->getMemPort()->writeBlob(ArmLinuxProcess::commPage + 0x0ff0,
(uint8_t *)&tlsPtr, sizeof(tlsPtr));
tc->setMiscReg(MISCREG_TPIDRURO,tlsPtr);
return 0;
}
@ -508,7 +509,7 @@ ArmLinuxProcess::startup()
ThreadContext *tc = system->getThreadContext(contextIds[0]);
uint8_t swiNeg1[] = {
0xff, 0xff, 0xff, 0xef //swi -1
0xff, 0xff, 0xff, 0xef // swi -1
};
// Fill this page with swi -1 so we'll no if we land in it somewhere.
@ -521,7 +522,8 @@ ArmLinuxProcess::startup()
// @todo Add a barrrier in this code
uint8_t memory_barrier[] =
{
0x0e, 0xf0, 0xa0, 0xe1 //usr_ret lr
0x5f, 0xf0, 0x7f, 0xf5, // dmb
0x0e, 0xf0, 0xa0, 0xe1 // return
};
tc->getMemPort()->writeBlob(commPage + 0x0fa0, memory_barrier,
sizeof(memory_barrier));
@ -531,18 +533,22 @@ ArmLinuxProcess::startup()
// @todo replace this with ldrex/strex and dmb
uint8_t cmpxchg[] =
{
0x00, 0x30, 0x92, 0xe5, //ldr r3, [r2]
0x00, 0x30, 0x53, 0xe0, //subs r3, r3, r0
0x00, 0x10, 0x82, 0x05, //streq r1, [r2]
0x03, 0x00, 0xa0, 0xe1, //mov r0, r3
0x0e, 0xf0, 0xa0, 0xe1 //usr_ret lr
0x9f, 0x3f, 0x92, 0xe1, // ldrex r3, [r2]
0x00, 0x30, 0x53, 0xe0, // subs r3, r3, r0
0x91, 0x3f, 0x82, 0x01, // strexeq r3, r1, [r2]
0x01, 0x00, 0x33, 0x03, // teqeq r3, #1
0xfa, 0xff, 0xff, 0x0a, // beq 1b
0x00, 0x00, 0x73, 0xe2, // rsbs r0, r3, #0
0x5f, 0xf0, 0x7f, 0xf5, // dmb
0x0e, 0xf0, 0xa0, 0xe1 // return
};
tc->getMemPort()->writeBlob(commPage + 0x0fc0, cmpxchg, sizeof(cmpxchg));
uint8_t get_tls[] =
{
0x08, 0x00, 0x9f, 0xe5, //ldr r0, [pc, #(16 - 8)]
0x0e, 0xf0, 0xa0, 0xe1 //usr_ret lr
// read user read-only thread id register
0x70, 0x0f, 0x1d, 0xee, // mrc p15, 0, r0, c13, c0, 3
0x0e, 0xf0, 0xa0, 0xe1 // return
};
tc->getMemPort()->writeBlob(commPage + 0x0fe0, get_tls, sizeof(get_tls));
}

14
src/sim/syscall_emul.cc
View file

@ -97,6 +97,18 @@ ignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
}
SyscallReturn
ignoreWarnOnceFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
warn_once("ignoring syscall %s(%d, %d, ...)", desc->name,
process->getSyscallArg(tc, index), process->getSyscallArg(tc, index));
return 0;
}
SyscallReturn
exitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
@ -802,6 +814,8 @@ cloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
for (int y = 8; y < 32; y++)
ctc->setIntReg(y, tc->readIntReg(y));
#elif THE_ISA == ARM_ISA
TheISA::copyRegs(tc, ctc);
#else
fatal("sys_clone is not implemented for this ISA\n");
#endif

2
src/sim/syscall_emul.hh
View file

@ -187,6 +187,8 @@ SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
/// trace flag is enabled. Return success to the target program.
SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target exit() handler: terminate current context.
SyscallReturn exitFunc(SyscallDesc *desc, int num,