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2002-02-21 Elena Zannoni <ezannoni@redhat.com>

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* ppc-linux-nat.c (PTRACE_GETVRREGS, PTRACE_SETVRREGS): Define.
	(have_ptrace_getvrregs): Define for run time checks.
	(gdb_vrregset_t): New type for Altivec register handling.
	(fetch_register, store_register): Fetch/store altivec register
	when needed.
	(fetch_altivec_register, store_altivec_register): New functions.
	(supply_vrregset, fill_vrregset): New functions.
	(fetch_altivec_registers, store_altivec_registers): New functions.
	(fetch_ppc_registers, store_ppc_registers): Fetch/store altivec
	registers as well.
This commit is contained in:
Elena Zannoni 2002-02-21 22:04:46 +00:00
parent 27924826b5
commit 9abe545046
2 changed files with 256 additions and 14 deletions
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13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
2002-02-21 Elena Zannoni <ezannoni@redhat.com>
* ppc-linux-nat.c (PTRACE_GETVRREGS, PTRACE_SETVRREGS): Define.
(have_ptrace_getvrregs): Define for run time checks.
(gdb_vrregset_t): New type for Altivec register handling.
(fetch_register, store_register): Fetch/store altivec register
when needed.
(fetch_altivec_register, store_altivec_register): New functions.
(supply_vrregset, fill_vrregset): New functions.
(fetch_altivec_registers, store_altivec_registers): New functions.
(fetch_ppc_registers, store_ppc_registers): Fetch/store altivec
registers as well.
2002-02-21 Jiri Smid <smid@suse.cz>
* config/i386/x86-64linux.mh (NATDEPFILES): Remove x86-64-nat.o.

249
gdb/ppc-linux-nat.c
View File

@ -1,4 +1,4 @@
/* PPC linux native support.
/* PPC GNU/Linux native support.
Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002
Free Software Foundation, Inc.
@ -51,6 +51,56 @@
#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)
{
@ -109,6 +159,40 @@ ppc_ptrace_cannot_fetch_store_register (int regno)
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, &regs);
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)
{
@ -119,6 +203,22 @@ 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 */
@ -142,14 +242,59 @@ fetch_register (int tid, int regno)
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, &regs);
if (ret < 0)
{
if (errno == EIO)
{
have_ptrace_getvrregs = 0;
return;
}
perror_with_name ("Unable to fetch AltiVec registers");
}
supply_vrregset (&regs);
}
static void
fetch_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++)
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
@ -172,6 +317,39 @@ fetch_inferior_registers (int 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, &regs);
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, &regs);
if (ret < 0)
perror_with_name ("Unable to store AltiVec register");
}
static void
store_register (int tid, int regno)
{
@ -182,11 +360,15 @@ 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))
{
@ -203,14 +385,61 @@ store_register (int tid, int regno)
}
}
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) &regs);
if (ret < 0)
{
if (errno == EIO)
{
have_ptrace_getvrregs = 0;
return;
}
perror_with_name ("Couldn't get AltiVec registers");
}
fill_vrregset (&regs);
if (ptrace (PTRACE_SETVRREGS, tid, 0, (int) &regs) < 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
@ -281,15 +510,15 @@ 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. */
(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)
{