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Various fixes to TLS for MIPS.

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- Clear the current thread's TLS pointer on exec. Previously the TLS
  pointer (and register) remain unchanged.

- Explicitly clear the TLS pointer when new threads are created.

- Make md_tls_tcb_offset per-process instead of per-thread.

  The layout of the TLS and TCB are identical for all threads in a
  process, it is only the TLS pointer values themselves that vary by
  thread.  This also makes setting md_tls_tcb_offset in
  cpu_set_user_tls() redundant with the setting in exec_setregs(), so
  only set it in exec_setregs().

Submitted by:	Alfredo Mazzinghi (1)
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D24957
This commit is contained in:
John Baldwin 2020-06-12 21:21:18 +00:00
parent 6fba90f201
commit 822d2d6ac9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362122
7 changed files with 16 additions and 17 deletions
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4
sys/mips/include/proc.h
View File

@ -64,7 +64,6 @@ struct mdthread {
int md_pc_count; /* performance counter */
int md_pc_spill; /* performance counter spill */
void *md_tls;
size_t md_tls_tcb_offset; /* TCB offset */
#ifdef CPU_CNMIPS
struct octeon_cop2_state *md_cop2; /* kernel context */
struct octeon_cop2_state *md_ucop2; /* userland context */
@ -79,8 +78,7 @@ struct mdthread {
#define MDTD_COP2USED 0x0002 /* Process used the COP2 */
struct mdproc {
/* Avoid empty structs because they are undefined behavior. */
long md_spare;
size_t md_tls_tcb_offset; /* TCB offset */
};
struct syscall_args {

4
sys/mips/mips/genassym.c
View File

@ -70,13 +70,15 @@ __FBSDID("$FreeBSD$");
#endif
ASSYM(TD_PCB, offsetof(struct thread, td_pcb));
ASSYM(TD_PROC, offsetof(struct thread, td_proc));
ASSYM(TD_UPTE, offsetof(struct thread, td_md.md_upte));
ASSYM(TD_KSTACK, offsetof(struct thread, td_kstack));
ASSYM(TD_FLAGS, offsetof(struct thread, td_flags));
ASSYM(TD_LOCK, offsetof(struct thread, td_lock));
ASSYM(TD_MDFLAGS, offsetof(struct thread, td_md.md_flags));
ASSYM(TD_MDTLS, offsetof(struct thread, td_md.md_tls));
ASSYM(TD_MDTLS_TCB_OFFSET, offsetof(struct thread, td_md.md_tls_tcb_offset));
ASSYM(P_MDTLS_TCB_OFFSET, offsetof(struct proc, p_md.md_tls_tcb_offset));
ASSYM(U_PCB_REGS, offsetof(struct pcb, pcb_regs.zero));
ASSYM(U_PCB_CONTEXT, offsetof(struct pcb, pcb_context));

7
sys/mips/mips/pm_machdep.c
View File

@ -473,12 +473,15 @@ exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
PCPU_SET(fpcurthread, (struct thread *)0);
td->td_md.md_ss_addr = 0;
td->td_md.md_tls = NULL;
#ifdef COMPAT_FREEBSD32
if (!SV_PROC_FLAG(td->td_proc, SV_LP64))
td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE32;
td->td_proc->p_md.md_tls_tcb_offset = TLS_TP_OFFSET +
TLS_TCB_SIZE32;
else
#endif
td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE;
td->td_proc->p_md.md_tls_tcb_offset = TLS_TP_OFFSET +
TLS_TCB_SIZE;
}
int

3
sys/mips/mips/swtch.S
View File

@ -386,7 +386,8 @@ sw2:
.globl cpu_switch_set_userlocal
cpu_switch_set_userlocal:
PTR_L t0, TD_MDTLS(a1) # Get TLS pointer
PTR_L t1, TD_MDTLS_TCB_OFFSET(a1) # Get TLS/TCB offset
PTR_L t1, TD_PROC(a1)
PTR_L t1, P_MDTLS_TCB_OFFSET(t1) # Get TLS/TCB offset
PTR_ADDU v0, t0, t1
MTC0 v0, MIPS_COP_0_USERLOCAL, 2 # write it to ULR for rdhwr

2
sys/mips/mips/sys_machdep.c
View File

@ -72,7 +72,7 @@ sysarch(struct thread *td, struct sysarch_args *uap)
*/
if (cpuinfo.userlocal_reg == true) {
mips_wr_userlocal((unsigned long)(uap->parms +
td->td_md.md_tls_tcb_offset));
td->td_proc->p_md.md_tls_tcb_offset));
}
return (0);
case MIPS_GET_TLS:

2
sys/mips/mips/trap.c
View File

@ -902,7 +902,7 @@ trap(struct trapframe *trapframe)
if (inst.RType.rd == 29) {
frame_regs = &(trapframe->zero);
frame_regs[inst.RType.rt] = (register_t)(intptr_t)td->td_md.md_tls;
frame_regs[inst.RType.rt] += td->td_md.md_tls_tcb_offset;
frame_regs[inst.RType.rt] += td->td_proc->p_md.md_tls_tcb_offset;
trapframe->pc += sizeof(int);
goto out;
}

11
sys/mips/mips/vm_machdep.c
View File

@ -141,7 +141,7 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
*/
td2->td_md.md_tls = td1->td_md.md_tls;
td2->td_md.md_tls_tcb_offset = td1->td_md.md_tls_tcb_offset;
p2->p_md.md_tls_tcb_offset = td1->td_proc->p_md.md_tls_tcb_offset;
td2->td_md.md_saved_intr = MIPS_SR_INT_IE;
td2->td_md.md_spinlock_count = 1;
#ifdef CPU_CNMIPS
@ -403,6 +403,7 @@ cpu_copy_thread(struct thread *td, struct thread *td0)
(MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX | MIPS_SR_SX) |
(MIPS_SR_INT_IE | MIPS_HARD_INT_MASK));
#endif
td->td_md.md_tls = NULL;
}
/*
@ -473,16 +474,10 @@ int
cpu_set_user_tls(struct thread *td, void *tls_base)
{
#if defined(__mips_n64) && defined(COMPAT_FREEBSD32)
if (td->td_proc && SV_PROC_FLAG(td->td_proc, SV_ILP32))
td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE32;
else
#endif
td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE;
td->td_md.md_tls = (char*)tls_base;
if (td == curthread && cpuinfo.userlocal_reg == true) {
mips_wr_userlocal((unsigned long)tls_base +
td->td_md.md_tls_tcb_offset);
td->td_proc->p_md.md_tls_tcb_offset);
}
return (0);