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* [binutils-gdb] fbsd-nat: Pass an optional register base to the register set helpers.
@ 2022-11-22 22:43 John Baldwin
0 siblings, 0 replies; only message in thread
From: John Baldwin @ 2022-11-22 22:43 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a141d32c6ef5c644c856d89de88f9980ec3d8ceb
commit a141d32c6ef5c644c856d89de88f9980ec3d8ceb
Author: John Baldwin <jhb@FreeBSD.org>
Date: Tue Nov 22 14:21:13 2022 -0800
fbsd-nat: Pass an optional register base to the register set helpers.
This is needed to permit using the helpers for register sets with a
variable base. In particular regnum needs to be converted into a
relative register number before passed to regcache_map_supplies.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Diff:
---
gdb/fbsd-nat.c | 34 +++++++++++++++++++---------------
gdb/fbsd-nat.h | 37 ++++++++++++++++++++++---------------
2 files changed, 41 insertions(+), 30 deletions(-)
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 7d279810483..1aec75050ae 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -1732,14 +1732,15 @@ fbsd_nat_target::supports_disable_randomization ()
bool
fbsd_nat_target::fetch_register_set (struct regcache *regcache, int regnum,
int fetch_op, const struct regset *regset,
- void *regs, size_t size)
+ int regbase, void *regs, size_t size)
{
const struct regcache_map_entry *map
= (const struct regcache_map_entry *) regset->regmap;
pid_t pid = get_ptrace_pid (regcache->ptid ());
- if (regnum == -1 || regcache_map_supplies (map, regnum, regcache->arch(),
- size))
+ if (regnum == -1
+ || (regnum >= regbase && regcache_map_supplies (map, regnum - regbase,
+ regcache->arch(), size)))
{
if (ptrace (fetch_op, pid, (PTRACE_TYPE_ARG3) regs, 0) == -1)
perror_with_name (_("Couldn't get registers"));
@@ -1755,15 +1756,16 @@ fbsd_nat_target::fetch_register_set (struct regcache *regcache, int regnum,
bool
fbsd_nat_target::store_register_set (struct regcache *regcache, int regnum,
int fetch_op, int store_op,
- const struct regset *regset, void *regs,
- size_t size)
+ const struct regset *regset, int regbase,
+ void *regs, size_t size)
{
const struct regcache_map_entry *map
= (const struct regcache_map_entry *) regset->regmap;
pid_t pid = get_ptrace_pid (regcache->ptid ());
- if (regnum == -1 || regcache_map_supplies (map, regnum, regcache->arch(),
- size))
+ if (regnum == -1
+ || (regnum >= regbase && regcache_map_supplies (map, regnum - regbase,
+ regcache->arch(), size)))
{
if (ptrace (fetch_op, pid, (PTRACE_TYPE_ARG3) regs, 0) == -1)
perror_with_name (_("Couldn't get registers"));
@@ -1796,15 +1798,16 @@ fbsd_nat_target::have_regset (ptid_t ptid, int note)
bool
fbsd_nat_target::fetch_regset (struct regcache *regcache, int regnum, int note,
- const struct regset *regset, void *regs,
- size_t size)
+ const struct regset *regset, int regbase,
+ void *regs, size_t size)
{
const struct regcache_map_entry *map
= (const struct regcache_map_entry *) regset->regmap;
pid_t pid = get_ptrace_pid (regcache->ptid ());
- if (regnum == -1 || regcache_map_supplies (map, regnum, regcache->arch(),
- size))
+ if (regnum == -1
+ || (regnum >= regbase && regcache_map_supplies (map, regnum - regbase,
+ regcache->arch(), size)))
{
struct iovec iov;
@@ -1821,15 +1824,16 @@ fbsd_nat_target::fetch_regset (struct regcache *regcache, int regnum, int note,
bool
fbsd_nat_target::store_regset (struct regcache *regcache, int regnum, int note,
- const struct regset *regset, void *regs,
- size_t size)
+ const struct regset *regset, int regbase,
+ void *regs, size_t size)
{
const struct regcache_map_entry *map
= (const struct regcache_map_entry *) regset->regmap;
pid_t pid = get_ptrace_pid (regcache->ptid ());
- if (regnum == -1 || regcache_map_supplies (map, regnum, regcache->arch(),
- size))
+ if (regnum == -1
+ || (regnum >= regbase && regcache_map_supplies (map, regnum - regbase,
+ regcache->arch(), size)))
{
struct iovec iov;
diff --git a/gdb/fbsd-nat.h b/gdb/fbsd-nat.h
index 7a0510c32bd..311ed4ad43a 100644
--- a/gdb/fbsd-nat.h
+++ b/gdb/fbsd-nat.h
@@ -133,7 +133,8 @@ private:
/* Helper routines for use in fetch_registers and store_registers in
subclasses. These routines fetch and store a single set of
registers described by REGSET. The REGSET's 'regmap' field must
- point to an array of 'struct regcache_map_entry'.
+ point to an array of 'struct regcache_map_entry'. The valid
+ register numbers in the register map are relative to REGBASE.
FETCH_OP is a ptrace operation to fetch the set of registers from
a native thread. STORE_OP is a ptrace operation to store the set
@@ -143,24 +144,27 @@ private:
and SIZE is the size of the storage.
Returns true if the register set was transferred due to a
- matching REGNUM.*/
+ matching REGNUM. */
bool fetch_register_set (struct regcache *regcache, int regnum, int fetch_op,
- const struct regset *regset, void *regs, size_t size);
+ const struct regset *regset, int regbase, void *regs,
+ size_t size);
bool store_register_set (struct regcache *regcache, int regnum, int fetch_op,
int store_op, const struct regset *regset,
- void *regs, size_t size);
+ int regbase, void *regs, size_t size);
/* Helper routines which use PT_GETREGSET and PT_SETREGSET for the
specified NOTE instead of regset-specific fetch and store
ops. */
bool fetch_regset (struct regcache *regcache, int regnum, int note,
- const struct regset *regset, void *regs, size_t size);
+ const struct regset *regset, int regbase, void *regs,
+ size_t size);
bool store_regset (struct regcache *regcache, int regnum, int note,
- const struct regset *regset, void *regs, size_t size);
+ const struct regset *regset, int regbase, void *regs,
+ size_t size);
protected:
/* Wrapper versions of the above helpers which accept a register set
@@ -168,20 +172,21 @@ protected:
template <class Regset>
bool fetch_register_set (struct regcache *regcache, int regnum, int fetch_op,
- const struct regset *regset)
+ const struct regset *regset, int regbase = 0)
{
Regset regs;
- return fetch_register_set (regcache, regnum, fetch_op, regset, ®s,
- sizeof (regs));
+ return fetch_register_set (regcache, regnum, fetch_op, regset, regbase,
+ ®s, sizeof (regs));
}
template <class Regset>
bool store_register_set (struct regcache *regcache, int regnum, int fetch_op,
- int store_op, const struct regset *regset)
+ int store_op, const struct regset *regset,
+ int regbase = 0)
{
Regset regs;
return store_register_set (regcache, regnum, fetch_op, store_op, regset,
- ®s, sizeof (regs));
+ regbase, ®s, sizeof (regs));
}
/* Helper routine for use in read_description in subclasses. This
@@ -197,18 +202,20 @@ protected:
template <class Regset>
bool fetch_regset (struct regcache *regcache, int regnum, int note,
- const struct regset *regset)
+ const struct regset *regset, int regbase = 0)
{
Regset regs;
- return fetch_regset (regcache, regnum, note, regset, ®s, sizeof (regs));
+ return fetch_regset (regcache, regnum, note, regset, regbase, ®s,
+ sizeof (regs));
}
template <class Regset>
bool store_regset (struct regcache *regcache, int regnum, int note,
- const struct regset *regset)
+ const struct regset *regset, int regbase = 0)
{
Regset regs;
- return store_regset (regcache, regnum, note, regset, ®s, sizeof (regs));
+ return store_regset (regcache, regnum, note, regset, regbase, ®s,
+ sizeof (regs));
}
};
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