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-rw-r--r--gdb/ppc-linux-nat.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c
index f96fba4..27c73c2 100644
--- a/gdb/ppc-linux-nat.c
+++ b/gdb/ppc-linux-nat.c
@@ -31,6 +31,7 @@
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
+#include <sys/uio.h>
#include "gdb_wait.h"
#include <fcntl.h>
#include <sys/procfs.h>
@@ -528,10 +529,83 @@ fetch_spe_register (struct regcache *regcache, int tid, int regno)
regcache->raw_supply (tdep->ppc_spefscr_regnum, &evrregs.spefscr);
}
+/* Use ptrace to fetch all registers from the register set with note
+ type REGSET_ID, size REGSIZE, and layout described by REGSET, from
+ process/thread TID and supply their values to REGCACHE. If ptrace
+ returns ENODATA to indicate the regset is unavailable, mark the
+ registers as unavailable in REGCACHE. */
+
+static void
+fetch_regset (struct regcache *regcache, int tid,
+ int regset_id, int regsetsize, const struct regset *regset)
+{
+ void *buf = alloca (regsetsize);
+ struct iovec iov;
+
+ iov.iov_base = buf;
+ iov.iov_len = regsetsize;
+
+ if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) < 0)
+ {
+ if (errno == ENODATA)
+ regset->supply_regset (regset, regcache, -1, NULL, regsetsize);
+ else
+ perror_with_name (_("Couldn't get register set"));
+ }
+ else
+ regset->supply_regset (regset, regcache, -1, buf, regsetsize);
+}
+
+/* Use ptrace to store register REGNUM of the regset with note type
+ REGSET_ID, size REGSETSIZE, and layout described by REGSET, from
+ REGCACHE back to process/thread TID. If REGNUM is -1 all registers
+ in the set are collected and stored. */
+
+static void
+store_regset (const struct regcache *regcache, int tid, int regnum,
+ int regset_id, int regsetsize, const struct regset *regset)
+{
+ void *buf = alloca (regsetsize);
+ struct iovec iov;
+
+ iov.iov_base = buf;
+ iov.iov_len = regsetsize;
+
+ /* Make sure that the buffer that will be stored has up to date values
+ for the registers that won't be collected. */
+ if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) < 0)
+ perror_with_name (_("Couldn't get register set"));
+
+ regset->collect_regset (regset, regcache, regnum, buf, regsetsize);
+
+ if (ptrace (PTRACE_SETREGSET, tid, regset_id, &iov) < 0)
+ perror_with_name (_("Couldn't set register set"));
+}
+
+/* Check whether the kernel provides a register set with number
+ REGSET_ID of size REGSETSIZE for process/thread TID. */
+
+static bool
+check_regset (int tid, int regset_id, int regsetsize)
+{
+ void *buf = alloca (regsetsize);
+ struct iovec iov;
+
+ iov.iov_base = buf;
+ iov.iov_len = regsetsize;
+
+ if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) >= 0
+ || errno == ENODATA)
+ return true;
+ else
+ return false;
+}
+
static void
fetch_register (struct regcache *regcache, int tid, int regno)
{
struct gdbarch *gdbarch = regcache->arch ();
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* This isn't really an address. But ptrace thinks of it as one. */
CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno);
int bytes_transferred;
@@ -565,6 +639,24 @@ fetch_register (struct regcache *regcache, int tid, int regno)
fetch_spe_register (regcache, tid, regno);
return;
}
+ else if (regno == PPC_DSCR_REGNUM)
+ {
+ gdb_assert (tdep->ppc_dscr_regnum != -1);
+
+ fetch_regset (regcache, tid, NT_PPC_DSCR,
+ PPC_LINUX_SIZEOF_DSCRREGSET,
+ &ppc32_linux_dscrregset);
+ return;
+ }
+ else if (regno == PPC_PPR_REGNUM)
+ {
+ gdb_assert (tdep->ppc_ppr_regnum != -1);
+
+ fetch_regset (regcache, tid, NT_PPC_PPR,
+ PPC_LINUX_SIZEOF_PPRREGSET,
+ &ppc32_linux_pprregset);
+ return;
+ }
if (regaddr == -1)
{
@@ -758,6 +850,14 @@ fetch_ppc_registers (struct regcache *regcache, int tid)
fetch_vsx_registers (regcache, tid, -1);
if (tdep->ppc_ev0_upper_regnum >= 0)
fetch_spe_register (regcache, tid, -1);
+ if (tdep->ppc_ppr_regnum != -1)
+ fetch_regset (regcache, tid, NT_PPC_PPR,
+ PPC_LINUX_SIZEOF_PPRREGSET,
+ &ppc32_linux_pprregset);
+ if (tdep->ppc_dscr_regnum != -1)
+ fetch_regset (regcache, tid, NT_PPC_DSCR,
+ PPC_LINUX_SIZEOF_DSCRREGSET,
+ &ppc32_linux_dscrregset);
}
/* Fetch registers from the child process. Fetch all registers if
@@ -938,6 +1038,24 @@ store_register (const struct regcache *regcache, int tid, int regno)
store_spe_register (regcache, tid, regno);
return;
}
+ else if (regno == PPC_DSCR_REGNUM)
+ {
+ gdb_assert (tdep->ppc_dscr_regnum != -1);
+
+ store_regset (regcache, tid, regno, NT_PPC_DSCR,
+ PPC_LINUX_SIZEOF_DSCRREGSET,
+ &ppc32_linux_dscrregset);
+ return;
+ }
+ else if (regno == PPC_PPR_REGNUM)
+ {
+ gdb_assert (tdep->ppc_ppr_regnum != -1);
+
+ store_regset (regcache, tid, regno, NT_PPC_PPR,
+ PPC_LINUX_SIZEOF_PPRREGSET,
+ &ppc32_linux_pprregset);
+ return;
+ }
if (regaddr == -1)
return;
@@ -1149,6 +1267,14 @@ store_ppc_registers (const struct regcache *regcache, int tid)
store_vsx_registers (regcache, tid, -1);
if (tdep->ppc_ev0_upper_regnum >= 0)
store_spe_register (regcache, tid, -1);
+ if (tdep->ppc_ppr_regnum != -1)
+ store_regset (regcache, tid, -1, NT_PPC_PPR,
+ PPC_LINUX_SIZEOF_PPRREGSET,
+ &ppc32_linux_pprregset);
+ if (tdep->ppc_dscr_regnum != -1)
+ store_regset (regcache, tid, -1, NT_PPC_DSCR,
+ PPC_LINUX_SIZEOF_DSCRREGSET,
+ &ppc32_linux_dscrregset);
}
/* Fetch the AT_HWCAP entry from the aux vector. */
@@ -1163,6 +1289,19 @@ ppc_linux_get_hwcap (void)
return field;
}
+/* Fetch the AT_HWCAP2 entry from the aux vector. */
+
+static CORE_ADDR
+ppc_linux_get_hwcap2 (void)
+{
+ CORE_ADDR field;
+
+ if (target_auxv_search (current_top_target (), AT_HWCAP2, &field) != 1)
+ return 0;
+
+ return field;
+}
+
/* The cached DABR value, to install in new threads.
This variable is used when the PowerPC HWDEBUG ptrace
interface is not available. */
@@ -2222,6 +2361,7 @@ ppc_linux_nat_target::read_description ()
features.wordsize = ppc_linux_target_wordsize (tid);
CORE_ADDR hwcap = ppc_linux_get_hwcap ();
+ CORE_ADDR hwcap2 = ppc_linux_get_hwcap2 ();
if (have_ptrace_getsetvsxregs
&& (hwcap & PPC_FEATURE_HAS_VSX))
@@ -2256,6 +2396,11 @@ ppc_linux_nat_target::read_description ()
features.isa205 = ppc_linux_has_isa205 (hwcap);
+ if ((hwcap2 & PPC_FEATURE2_DSCR)
+ && check_regset (tid, NT_PPC_PPR, PPC_LINUX_SIZEOF_PPRREGSET)
+ && check_regset (tid, NT_PPC_DSCR, PPC_LINUX_SIZEOF_DSCRREGSET))
+ features.ppr_dscr = true;
+
return ppc_linux_match_description (features);
}
generated by cgit v1.1 at 2024-12-02 19:51:47 +0000