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authorDavid S. Miller <davem@redhat.com>2008-05-11 22:10:30 +0000
committerDavid S. Miller <davem@redhat.com>2008-05-11 22:10:30 +0000
commite8467b5ac5fe535b6e3f6a315f72e920ceb76612 (patch)
tree7873c2672c85f431f6810cca24aaf1f80048d5ea /gdb/sparc64-linux-tdep.c
parent87a7da84fb7962a7e52700eb154a959166e17eac (diff)
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* sparc-linux-tdep.c (PSR_SYSCALL): Define.
(sparc_linux_write_pc): New function. (sparc32_linux_init_abi): Register it. * sparc64-linux-tdep.c (TSTATE_SYSCALL): Define. (sparc64_linux_write_pc): New function. (sparc64_linux_init_abi): Register it.
Diffstat (limited to 'gdb/sparc64-linux-tdep.c')
-rw-r--r--gdb/sparc64-linux-tdep.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/gdb/sparc64-linux-tdep.c b/gdb/sparc64-linux-tdep.c
index 9f752b3..05218e1 100644
--- a/gdb/sparc64-linux-tdep.c
+++ b/gdb/sparc64-linux-tdep.c
@@ -174,6 +174,32 @@ sparc64_linux_collect_core_fpregset (const struct regset *regset,
sparc64_collect_fpregset (regcache, regnum, fpregs);
}
+/* Set the program counter for process PTID to PC. */
+
+#define TSTATE_SYSCALL 0x0000000000000020ULL
+
+static void
+sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ ULONGEST state;
+
+ regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
+ regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);
+
+ /* Clear the "in syscall" bit to prevent the kernel from
+ messing with the PCs we just installed, if we happen to be
+ within an interrupted system call that the kernel wants to
+ restart.
+
+ Note that after we return from the dummy call, the TSTATE et al.
+ registers will be automatically restored, and the kernel
+ continues to restart the system call at this point. */
+ regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
+ state &= ~TSTATE_SYSCALL;
+ regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
+}
+
static void
@@ -211,6 +237,8 @@ sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
/* Make sure we can single-step over signal return system calls. */
tdep->step_trap = sparc64_linux_step_trap;
+
+ set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);
}