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Read the tpidr register from NT_ARM_TLS on Linux.

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This commit is contained in:
John Baldwin
2022-05-03 16:05:11 -07:00
parent 9c27bc99e4
commit 3b4b3e438d
1 changed files with 67 additions and 1 deletions
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68
gdb/aarch64-linux-nat.c
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@ -431,6 +431,60 @@ store_mteregs_to_thread (struct regcache *regcache)
perror_with_name (_("unable to store MTE registers."));
}
/* Fill GDB's register array with the TLS register values from
the current thread. */
static void
fetch_tlsregs_from_thread (struct regcache *regcache)
{
aarch64_gdbarch_tdep *tdep
= (aarch64_gdbarch_tdep *) gdbarch_tdep (regcache->arch ());
int regno = tdep->tls_regnum;
gdb_assert (regno != -1);
uint64_t tpidr = 0;
struct iovec iovec;
iovec.iov_base = &tpidr;
iovec.iov_len = sizeof (tpidr);
int tid = get_ptrace_pid (regcache->ptid ());
if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_TLS, &iovec) != 0)
perror_with_name (_("unable to fetch TLS register."));
regcache->raw_supply (regno, &tpidr);
}
/* Store to the current thread the valid TLS register set in GDB's
register array. */
static void
store_tlsregs_to_thread (struct regcache *regcache)
{
aarch64_gdbarch_tdep *tdep
= (aarch64_gdbarch_tdep *) gdbarch_tdep (regcache->arch ());
int regno = tdep->tls_regnum;
gdb_assert (regno != -1);
uint64_t tpidr = 0;
if (REG_VALID != regcache->get_register_status (regno))
return;
regcache->raw_collect (regno, (char *) &tpidr);
struct iovec iovec;
iovec.iov_base = &tpidr;
iovec.iov_len = sizeof (tpidr);
int tid = get_ptrace_pid (regcache->ptid ());
if (ptrace (PTRACE_SETREGSET, tid, NT_ARM_TLS, &iovec) != 0)
perror_with_name (_("unable to store TLS register."));
}
/* Implement the "fetch_registers" target_ops method. */
void
@ -453,6 +507,9 @@ aarch64_linux_nat_target::fetch_registers (struct regcache *regcache,
if (tdep->has_mte ())
fetch_mteregs_from_thread (regcache);
if (tdep->has_tls ())
fetch_tlsregs_from_thread (regcache);
}
else if (regno < AARCH64_V0_REGNUM)
fetch_gregs_from_thread (regcache);
@ -472,6 +529,9 @@ aarch64_linux_nat_target::fetch_registers (struct regcache *regcache,
if (tdep->has_mte ()
&& (regno == tdep->mte_reg_base))
fetch_mteregs_from_thread (regcache);
if (tdep->has_tls () && regno == tdep->tls_regnum)
fetch_tlsregs_from_thread (regcache);
}
/* Implement the "store_registers" target_ops method. */
@ -493,6 +553,9 @@ aarch64_linux_nat_target::store_registers (struct regcache *regcache,
if (tdep->has_mte ())
store_mteregs_to_thread (regcache);
if (tdep->has_tls ())
store_tlsregs_to_thread (regcache);
}
else if (regno < AARCH64_V0_REGNUM)
store_gregs_to_thread (regcache);
@ -505,6 +568,9 @@ aarch64_linux_nat_target::store_registers (struct regcache *regcache,
if (tdep->has_mte ()
&& (regno == tdep->mte_reg_base))
store_mteregs_to_thread (regcache);
if (tdep->has_tls () && regno == tdep->tls_regnum)
store_tlsregs_to_thread (regcache);
}
/* Fill register REGNO (if it is a general-purpose register) in
@ -647,7 +713,7 @@ aarch64_linux_nat_target::read_description ()
bool mte_p = hwcap2 & HWCAP2_MTE;
return aarch64_read_description (aarch64_sve_get_vq (tid), pauth_p, mte_p,
false);
true);
}
/* Convert a native/host siginfo object, into/from the siginfo in the