-/* PPC linux native support.
+/* PPC GNU/Linux native support.
Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002
Free Software Foundation, Inc.
#define PTRACE_XFER_TYPE int
#endif
+/* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a
+ configure time check. Some older glibc's (for instance 2.2.1)
+ don't have a specific powerpc version of ptrace.h, and fall back on
+ a generic one. In such cases, sys/ptrace.h defines
+ PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that
+ ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and
+ PTRACE_SETVRREGS to be. This also makes a configury check pretty
+ much useless. */
+
+/* These definitions should really come from the glibc header files,
+ but Glibc doesn't know about the vrregs yet. */
+#ifndef PTRACE_GETVRREGS
+#define PTRACE_GETVRREGS 18
+#define PTRACE_SETVRREGS 19
+#endif
+
+/* This oddity is because the Linux kernel defines elf_vrregset_t as
+ an array of 33 16 bytes long elements. I.e. it leaves out vrsave.
+ However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return
+ the vrsave as an extra 4 bytes at the end. I opted for creating a
+ flat array of chars, so that it is easier to manipulate for gdb.
+
+ There are 32 vector registers 16 bytes longs, plus a VSCR register
+ which is only 4 bytes long, but is fetched as a 16 bytes
+ quantity. Up to here we have the elf_vrregset_t structure.
+ Appended to this there is space for the VRSAVE register: 4 bytes.
+ Even though this vrsave register is not included in the regset
+ typedef, it is handled by the ptrace requests.
+
+ Note that GNU/Linux doesn't support little endian PPC hardware,
+ therefore the offset at which the real value of the VSCR register
+ is located will be always 12 bytes.
+
+ The layout is like this (where x is the actual value of the vscr reg): */
+
+/* *INDENT-OFF* */
+/*
+ |.|.|.|.|.....|.|.|.|.||.|.|.|x||.|
+ <-------> <-------><-------><->
+ VR0 VR31 VSCR VRSAVE
+*/
+/* *INDENT-ON* */
+
+#define SIZEOF_VRREGS 33*16+4
+
+typedef char gdb_vrregset_t[SIZEOF_VRREGS];
+
+/* For runtime check of ptrace support for VRREGS. */
+int have_ptrace_getvrregs = 1;
+
int
kernel_u_size (void)
{
return (ppc_register_u_addr (regno) == -1);
}
+/* The Linux kernel ptrace interface for AltiVec registers uses the
+ registers set mechanism, as opposed to the interface for all the
+ other registers, that stores/fetches each register individually. */
+static void
+fetch_altivec_register (int tid, int regno)
+{
+ int ret;
+ int offset = 0;
+ gdb_vrregset_t regs;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Unable to fetch AltiVec register");
+ }
+
+ /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
+ long on the hardware. We deal only with the lower 4 bytes of the
+ vector. VRSAVE is at the end of the array in a 4 bytes slot, so
+ there is no need to define an offset for it. */
+ if (regno == (tdep->ppc_vrsave_regnum - 1))
+ offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+ supply_register (regno,
+ regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
+}
+
static void
fetch_register (int tid, int regno)
{
char *buf = alloca (MAX_REGISTER_RAW_SIZE);
CORE_ADDR regaddr = ppc_register_u_addr (regno);
+ if (altivec_register_p (regno))
+ {
+ /* If this is the first time through, or if it is not the first
+ time through, and we have comfirmed that there is kernel
+ support for such a ptrace request, then go and fetch the
+ register. */
+ if (have_ptrace_getvrregs)
+ {
+ fetch_altivec_register (tid, regno);
+ return;
+ }
+ /* If we have discovered that there is no ptrace support for
+ AltiVec registers, fall through and return zeroes, because
+ regaddr will be -1 in this case. */
+ }
+
if (regaddr == -1)
{
memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
supply_register (regno, buf);
}
+static void
+supply_vrregset (gdb_vrregset_t *vrregsetp)
+{
+ int i;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
+ int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+ int offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+ for (i = 0; i < num_of_vrregs; i++)
+ {
+ /* The last 2 registers of this set are only 32 bit long, not
+ 128. However an offset is necessary only for VSCR because it
+ occupies a whole vector, while VRSAVE occupies a full 4 bytes
+ slot. */
+ if (i == (num_of_vrregs - 2))
+ supply_register (tdep->ppc_vr0_regnum + i,
+ *vrregsetp + i * vrregsize + offset);
+ else
+ supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
+ }
+}
+
+static void
+fetch_altivec_registers (int tid)
+{
+ int ret;
+ gdb_vrregset_t regs;
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Unable to fetch AltiVec registers");
+ }
+ supply_vrregset (®s);
+}
+
static void
fetch_ppc_registers (int tid)
{
int i;
- int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum;
-
- for (i = 0; i <= last_register; i++)
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ for (i = 0; i <= tdep->ppc_mq_regnum; i++)
fetch_register (tid, i);
+ if (have_ptrace_getvrregs)
+ if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
+ fetch_altivec_registers (tid);
}
/* Fetch registers from the child process. Fetch all registers if
void
fetch_inferior_registers (int regno)
{
- /* Overload thread id onto process id */
+ /* Overload thread id onto process id */
int tid = TIDGET (inferior_ptid);
/* No thread id, just use process id */
if (tid == 0)
tid = PIDGET (inferior_ptid);
- if (regno == -1)
+ if (regno == -1)
fetch_ppc_registers (tid);
else
fetch_register (tid, regno);
}
/* Store one register. */
+static void
+store_altivec_register (int tid, int regno)
+{
+ int ret;
+ int offset = 0;
+ gdb_vrregset_t regs;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Unable to fetch AltiVec register");
+ }
+
+ /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
+ long on the hardware. */
+ if (regno == (tdep->ppc_vrsave_regnum - 1))
+ offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+ regcache_collect (regno,
+ regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
+
+ ret = ptrace (PTRACE_SETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ perror_with_name ("Unable to store AltiVec register");
+}
+
static void
store_register (int tid, int regno)
{
unsigned int offset; /* Offset of registers within the u area. */
char *buf = alloca (MAX_REGISTER_RAW_SIZE);
- if (regaddr == -1)
+ if (altivec_register_p (regno))
{
+ store_altivec_register (tid, regno);
return;
}
+ if (regaddr == -1)
+ return;
+
regcache_collect (regno, buf);
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
{
}
}
+static void
+fill_vrregset (gdb_vrregset_t *vrregsetp)
+{
+ int i;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
+ int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+ int offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+ for (i = 0; i < num_of_vrregs; i++)
+ {
+ /* The last 2 registers of this set are only 32 bit long, not
+ 128, but only VSCR is fetched as a 16 bytes quantity. */
+ if (i == (num_of_vrregs - 2))
+ regcache_collect (tdep->ppc_vr0_regnum + i,
+ *vrregsetp + i * vrregsize + offset);
+ else
+ regcache_collect (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
+ }
+}
+
+static void
+store_altivec_registers (int tid)
+{
+ int ret;
+ gdb_vrregset_t regs;
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, (int) ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Couldn't get AltiVec registers");
+ }
+
+ fill_vrregset (®s);
+
+ if (ptrace (PTRACE_SETVRREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name ("Couldn't write AltiVec registers");
+}
+
static void
store_ppc_registers (int tid)
{
int i;
- int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- for (i = 0; i <= last_register; i++)
+ for (i = 0; i <= tdep->ppc_mq_regnum; i++)
store_register (tid, i);
+ if (have_ptrace_getvrregs)
+ if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
+ store_altivec_registers (tid);
}
void
supply_fpregset (gdb_fpregset_t * fpregsetp)
{
int regi;
+
for (regi = 0; regi < 32; regi++)
supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
}
-/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), update the register specified by REGNO from gdb's idea
- of the current floating point register set. If REGNO is -1, update
- them all. */
-
+/* Given a pointer to a floating point register set in /proc format
+ (fpregset_t *), update the register specified by REGNO from gdb's
+ idea of the current floating point register set. If REGNO is -1,
+ update them all. */
void
fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
{
projects / binutils-gdb.git / commitdiff