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* NEWS: Mention ARM VFP support.

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* target-descriptions.c (tdesc_register_type): Make public.
	(tdesc_unnumbered_register): New function.
	(tdesc_register_reggroup_p): Allow missing
	pseudo_register_reggroup_p.
	* target-descriptions.h (tdesc_register_type): Declare.
	(tdesc_unnumbered_register): Declare.
	* arm-tdep.c (arm_neon_quad_read, arm_neon_quad_write): New functions.
	(arm_push_dummy_call): Use arm_neon_quad_write.
	(arm_neon_double_type, arm_neon_quad_type): New functions.
	(arm_register_type): Handle VFP and NEON registers.  Override the
	types of double-precision registers for NEON.  Disable FPA registers
	if they are not present.
	(arm_dwarf_reg_to_regnum): Add current VFP and NEON register numbers.
	(arm_return_value): Use arm_neon_quad_write and arm_neon_quad_read.
	(arm_register_name): Handle VFP single and NEON quad registers.
	(arm_pseudo_read, arm_pseudo_write): New functions.
	(arm_gdbarch_init): Check for VFP and NEON in the target description.
	Assign numbers to double-precision registers.  Register VFP and NEON
	pseudo registers.  Remove a shadowed "i" variable.
	* arm-tdep.h (enum gdb_regnum): Add ARM_D0_REGNUM and
	ARM_D31_REGNUM.
	(struct gdbarch_tdep): Add have_neon_pseudos, have_neon,
	have_vfp_registers, have_vfp_pseudos, neon_double_type,
	and neon_quad_type.

	* features/Makefile: Make expedite settings only architecture
	specific.
	(WHICH): Add new ARM descriptions.
	* features/arm-with-neon.xml, features/arm-with-vfpv2.c,
	features/arm-with-vfpv3.c, features/arm-vfpv2.xml,
	features/arm-vfpv3.xml, features/arm-with-vfpv2.xml,
	features/arm-with-vfpv3.xml, features/arm-with-neon.c: New files.
	* regformats/arm-with-neon.dat, regformats/arm-with-vfpv2.dat,
	regformats/arm-with-vfpv3.dat: Generate.

	doc/
	* gdb.texinfo (ARM Features): Document org.gnu.gdb.arm.vfp and
	org.gnu.gdb.arm.neon.

	gdbserver/
	* linux-low.c (linux_write_memory): Update debugging output.
	* Makefile.in (clean): Add new descriptions.
	(arm-with-vfpv2.o, arm-with-vfpv2.c, arm-with-vfpv3.o)
	(arm-with-vfpv3.c, arm-with-neon.o, arm-with-neon.c): New rules.
	* configure.srv: Add new files for arm*-*-linux*.
	* linux-arm-low.c: Add new declarations.
	(PTRACE_GETVFPREGS, PTRACE_SETVFPREGS): Define if undefined.
	(arm_hwcap, HWCAP_VFP, HWCAP_IWMMXT, HWCAP_NEON, HWCAP_VFPv3)
	(HWCAP_VFPv3D16): New.
	(arm_fill_wmmxregset, arm_store_wmmxregset): Check HWCAP_IWMMXT
	instead of __IWMMXT__.
	(arm_fill_vfpregset, arm_store_vfpregset, arm_get_hwcap)
	(arm_arch_setup): New.
	(target_regsets): Remove #ifdef.  Add VFP regset.
	(the_low_target): Use arm_arch_setup.

	testsuite/
	* gdb.base/float.exp: Handle VFP registers.
This commit is contained in:
Daniel Jacobowitz
2009-07-28 18:26:51 +00:00
parent 12b42a1250
commit 58d6951de5
27 changed files with 1215 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

153
gdb/gdbserver/linux-arm-low.c
View File

@@ -20,14 +20,17 @@
#include "server.h"
#include "linux-low.h"
#include <elf.h>
#include <sys/ptrace.h>
#include "gdb_proc_service.h"
/* Defined in auto-generated file reg-arm.c. */
/* Defined in auto-generated files. */
void init_registers_arm (void);
/* Defined in auto-generated file arm-with-iwmmxt.c. */
void init_registers_arm_with_iwmmxt (void);
void init_registers_arm_with_vfpv2 (void);
void init_registers_arm_with_vfpv3 (void);
void init_registers_arm_with_neon (void);
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 22
@@ -38,6 +41,20 @@ void init_registers_arm_with_iwmmxt (void);
# define PTRACE_SETWMMXREGS 19
#endif
#ifndef PTRACE_GETVFPREGS
# define PTRACE_GETVFPREGS 27
# define PTRACE_SETVFPREGS 28
#endif
static unsigned long arm_hwcap;
/* These are in <asm/elf.h> in current kernels. */
#define HWCAP_VFP 64
#define HWCAP_IWMMXT 512
#define HWCAP_NEON 4096
#define HWCAP_VFPv3 8192
#define HWCAP_VFPv3D16 16384
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
@@ -87,13 +104,14 @@ arm_store_gregset (const void *buf)
supply_register (i, zerobuf);
}
#ifdef __IWMMXT__
static void
arm_fill_wmmxregset (void *buf)
{
int i;
if (!(arm_hwcap & HWCAP_IWMMXT))
return;
for (i = 0; i < 16; i++)
collect_register (arm_num_regs + i, (char *) buf + i * 8);
@@ -107,6 +125,9 @@ arm_store_wmmxregset (const void *buf)
{
int i;
if (!(arm_hwcap & HWCAP_IWMMXT))
return;
for (i = 0; i < 16; i++)
supply_register (arm_num_regs + i, (char *) buf + i * 8);
@@ -115,7 +136,45 @@ arm_store_wmmxregset (const void *buf)
supply_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);
}
#endif /* __IWMMXT__ */
static void
arm_fill_vfpregset (void *buf)
{
int i, num, base;
if (!(arm_hwcap & HWCAP_VFP))
return;
if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
num = 32;
else
num = 16;
base = find_regno ("d0");
for (i = 0; i < num; i++)
collect_register (base + i, (char *) buf + i * 8);
collect_register_by_name ("fpscr", (char *) buf + 32 * 8);
}
static void
arm_store_vfpregset (const void *buf)
{
int i, num, base;
if (!(arm_hwcap & HWCAP_VFP))
return;
if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
num = 32;
else
num = 16;
base = find_regno ("d0");
for (i = 0; i < num; i++)
supply_register (base + i, (char *) buf + i * 8);
supply_register_by_name ("fpscr", (char *) buf + 32 * 8);
}
extern int debug_threads;
@@ -208,24 +267,94 @@ ps_get_thread_area (const struct ps_prochandle *ph,
return PS_OK;
}
static int
arm_get_hwcap (unsigned long *valp)
{
unsigned char *data = alloca (8);
int offset = 0;
while ((*the_target->read_auxv) (offset, data, 8) == 8)
{
unsigned int *data_p = (unsigned int *)data;
if (data_p[0] == AT_HWCAP)
{
*valp = data_p[1];
return 1;
}
offset += 8;
}
*valp = 0;
return 0;
}
static void
arm_arch_setup (void)
{
arm_hwcap = 0;
if (arm_get_hwcap (&arm_hwcap) == 0)
{
init_registers_arm ();
return;
}
if (arm_hwcap & HWCAP_IWMMXT)
{
init_registers_arm_with_iwmmxt ();
return;
}
if (arm_hwcap & HWCAP_VFP)
{
int pid;
char *buf;
/* NEON implies either no VFP, or VFPv3-D32. We only support
it with VFP. */
if (arm_hwcap & HWCAP_NEON)
init_registers_arm_with_neon ();
else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
init_registers_arm_with_vfpv3 ();
else
init_registers_arm_with_vfpv2 ();
/* Now make sure that the kernel supports reading these
registers. Support was added in 2.6.30. */
pid = lwpid_of (get_thread_lwp (current_inferior));
errno = 0;
buf = malloc (32 * 8 + 4);
if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
&& errno == EIO)
{
arm_hwcap = 0;
init_registers_arm ();
}
free (buf);
return;
}
/* The default configuration uses legacy FPA registers, probably
simulated. */
init_registers_arm ();
}
struct regset_info target_regsets[] = {
{ PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4,
GENERAL_REGS,
arm_fill_gregset, arm_store_gregset },
#ifdef __IWMMXT__
{ PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4,
EXTENDED_REGS,
arm_fill_wmmxregset, arm_store_wmmxregset },
#endif
{ PTRACE_GETVFPREGS, PTRACE_SETVFPREGS, 32 * 8 + 4,
EXTENDED_REGS,
arm_fill_vfpregset, arm_store_vfpregset },
{ 0, 0, -1, -1, NULL, NULL }
};
struct linux_target_ops the_low_target = {
#ifdef __IWMMXT__
init_registers_arm_with_iwmmxt,
#else
init_registers_arm,
#endif
arm_arch_setup,
arm_num_regs,
arm_regmap,
arm_cannot_fetch_register,