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[PATCH] %g0 on sparc should always be available
- From: Mark Kettenis <mark dot kettenis at xs4all dot nl>
- To: gdb-patches at sourceware dot org
- Date: Sat, 21 May 2011 21:19:49 +0200 (CEST)
- Subject: [PATCH] %g0 on sparc should always be available
Many RISC CPUs have a register that's hardwired to 0. Typically GDB
code uses regcache_raw_supply(..., ..., NULL) to "transfer" the value
of such a register. However these days, that marks the register as
unavailable. This diff fixes that for %g0 on SPARC.
Committed as obvious.
2011-05-21 Mark Kettenis <kettenis@gnu.org>
* sparc-nat.c (sparc_fetch_inferior_registers): Explicitly supply
zero as the value for %g0 in the register cache.
* sparc-tdep.c (sparc32_supply_gregset): Likewise.
* sparc64-tdep.c (sparc64_supply_gregset): Likewise.
Index: sparc-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/sparc-nat.c,v
retrieving revision 1.43
diff -u -p -r1.43 sparc-nat.c
--- sparc-nat.c 1 Jan 2011 15:33:15 -0000 1.43
+++ sparc-nat.c 21 May 2011 19:08:34 -0000
@@ -159,7 +159,9 @@ sparc_fetch_inferior_registers (struct t
if (regnum == SPARC_G0_REGNUM)
{
- regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
+ gdb_byte zero[8] = { 0 };
+
+ regcache_raw_supply (regcache, SPARC_G0_REGNUM, &zero);
return;
}
Index: sparc-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/sparc-tdep.c,v
retrieving revision 1.219
diff -u -p -r1.219 sparc-tdep.c
--- sparc-tdep.c 18 Mar 2011 18:52:32 -0000 1.219
+++ sparc-tdep.c 21 May 2011 19:08:34 -0000
@@ -1618,6 +1618,7 @@ sparc32_supply_gregset (const struct spa
int regnum, const void *gregs)
{
const gdb_byte *regs = gregs;
+ gdb_byte zero[4] = { 0 };
int i;
if (regnum == SPARC32_PSR_REGNUM || regnum == -1)
@@ -1637,7 +1638,7 @@ sparc32_supply_gregset (const struct spa
regs + gregset->r_y_offset);
if (regnum == SPARC_G0_REGNUM || regnum == -1)
- regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
+ regcache_raw_supply (regcache, SPARC_G0_REGNUM, &zero);
if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1)
{
Index: sparc64-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/sparc64-tdep.c,v
retrieving revision 1.53
diff -u -p -r1.53 sparc64-tdep.c
--- sparc64-tdep.c 18 Mar 2011 18:52:32 -0000 1.53
+++ sparc64-tdep.c 21 May 2011 19:08:35 -0000
@@ -1206,6 +1206,7 @@ sparc64_supply_gregset (const struct spa
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int sparc32 = (gdbarch_ptr_bit (gdbarch) == 32);
const gdb_byte *regs = gregs;
+ gdb_byte zero[8] = { 0 };
int i;
if (sparc32)
@@ -1268,7 +1269,7 @@ sparc64_supply_gregset (const struct spa
}
if (regnum == SPARC_G0_REGNUM || regnum == -1)
- regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
+ regcache_raw_supply (regcache, SPARC_G0_REGNUM, &zero);
if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1)
{