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[PATCH 5/6] Fetch and store FP registers by PTRACE_{G,S}ETREGSET
- From: Yao Qi <qiyaoltc at gmail dot com>
- To: gdb-patches at sourceware dot org
- Date: Thu, 28 May 2015 15:20:15 +0100
- Subject: [PATCH 5/6] Fetch and store FP registers by PTRACE_{G,S}ETREGSET
- Authentication-results: sourceware.org; auth=none
- References: <1432822816-32327-1-git-send-email-yao dot qi at linaro dot org>
If kernel supports PTRACE_GETREGSET, GDB uses PTRACE_{G,S}ETREGSET
to fetch and store FP registers.
gdb:
2015-05-28 Yao Qi <yao.qi@linaro.org>
* arm-linux-nat.c (fetch_fpregister): Use PTRACE_GETREGSET.
(fetch_fpregs): Likewise.
* arm-linux-nat.c (store_fpregister): Use PTRACE_SETREGSET.
(store_fpregs): Likewise.
---
gdb/arm-linux-nat.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 74 insertions(+), 7 deletions(-)
diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c
index 0a86ed6..b74767c 100644
--- a/gdb/arm-linux-nat.c
+++ b/gdb/arm-linux-nat.c
@@ -88,12 +88,23 @@ fetch_fpregister (struct regcache *regcache, int regno)
{
int ret, tid;
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
-
+
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
- ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+ if (have_ptrace_getregset == 1)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+
if (ret < 0)
{
warning (_("Unable to fetch floating point register."));
@@ -123,7 +134,18 @@ fetch_fpregs (struct regcache *regcache)
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
- ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+ if (have_ptrace_getregset == 1)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+
if (ret < 0)
{
warning (_("Unable to fetch the floating point registers."));
@@ -152,7 +174,18 @@ store_fpregister (const struct regcache *regcache, int regno)
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
- ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+ if (have_ptrace_getregset == 1)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+
if (ret < 0)
{
warning (_("Unable to fetch the floating point registers."));
@@ -168,7 +201,18 @@ store_fpregister (const struct regcache *regcache, int regno)
if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
collect_nwfpe_register (regcache, regno, fp);
- ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
+ if (have_ptrace_getregset == 1)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
+
if (ret < 0)
{
warning (_("Unable to store floating point register."));
@@ -189,7 +233,19 @@ store_fpregs (const struct regcache *regcache)
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
- ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+ if (have_ptrace_getregset == 1)
+ {
+ elf_fpregset_t fpregs;
+ struct iovec iov;
+
+ iov.iov_base = &fpregs;
+ iov.iov_len = sizeof (fpregs);
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+
if (ret < 0)
{
warning (_("Unable to fetch the floating point registers."));
@@ -205,7 +261,18 @@ store_fpregs (const struct regcache *regcache)
if (REG_VALID == regcache_register_status (regcache, regno))
collect_nwfpe_register (regcache, regno, fp);
- ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
+ if (have_ptrace_getregset == 1)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
+
if (ret < 0)
{
warning (_("Unable to store floating point registers."));
--
1.9.1