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[PATCH 12/24] o32 sigframe unwinding with FR1
- From: Bhushan Attarde <bhushan dot attarde at imgtec dot com>
- To: <gdb-patches at sourceware dot org>
- Cc: <Maciej dot Rozycki at imgtec dot com>, <Matthew dot Fortune at imgtec dot com>, <James dot Hogan at imgtec dot com>, <Andrew dot Bennett at imgtec dot com>, <Jaydeep dot Patil at imgtec dot com>, Bhushan Attarde <bhushan dot attarde at imgtec dot com>
- Date: Mon, 27 Jun 2016 20:19:39 +0530
- Subject: [PATCH 12/24] o32 sigframe unwinding with FR1
- Authentication-results: sourceware.org; auth=none
- References: <1467038991-6600-1-git-send-email-bhushan dot attarde at imgtec dot com>
gdb/ChangeLog:
* mips-linux-tdep.c (SIGCONTEXT_USEDMATH): New definition.
(USED_FP, USED_FR1, USED_HYBRID_FPRS): Add fallback definitions.
(mips_linux_o32_sigframe_init): Frame override of raw register.
---
gdb/mips-linux-tdep.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c
index d337a5b..e1f113f 100644
--- a/gdb/mips-linux-tdep.c
+++ b/gdb/mips-linux-tdep.c
@@ -1053,6 +1053,7 @@ static const struct tramp_frame micromips_linux_n64_rt_sigframe = {
#define SIGCONTEXT_REGS (2 * 8)
#define SIGCONTEXT_FPREGS (34 * 8)
#define SIGCONTEXT_FPCSR (66 * 8 + 4)
+#define SIGCONTEXT_USEDMATH (67 * 8 + 4)
#define SIGCONTEXT_DSPCTL (68 * 8 + 0)
#define SIGCONTEXT_HI (69 * 8)
#define SIGCONTEXT_LO (70 * 8)
@@ -1067,6 +1068,16 @@ static const struct tramp_frame micromips_linux_n64_rt_sigframe = {
#define SIGCONTEXT_REG_SIZE 8
+#ifndef USED_FP
+#define USED_FP (1 << 0)
+#endif
+#ifndef USED_FR1
+#define USED_FR1 (1 << 1)
+#endif
+#ifndef USED_HYBRID_FPRS
+#define USED_HYBRID_FPRS (1 << 2)
+#endif
+
static void
mips_linux_o32_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
@@ -1079,6 +1090,9 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
CORE_ADDR sigcontext_base;
const struct mips_regnum *regs = mips_regnum (gdbarch);
CORE_ADDR regs_base;
+ gdb_byte buf[4];
+ uint32_t used_math;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
if (self == &mips_linux_o32_sigframe
|| self == µmips_linux_o32_sigframe)
@@ -1109,6 +1123,14 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
(regs_base + SIGCONTEXT_REGS
+ ireg * SIGCONTEXT_REG_SIZE));
+ /* Read the used_math field. */
+ if (safe_frame_unwind_memory (this_frame,
+ sigcontext_base + SIGCONTEXT_USEDMATH,
+ buf, 4))
+ used_math = extract_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch));
+ else
+ used_math = 0;
+
/* The way that floating point registers are saved, unfortunately,
depends on the architecture the kernel is built for. For the r3000 and
tx39, four bytes of each register are at the beginning of each of the
@@ -1118,7 +1140,18 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
layout, since we can't tell, and it's much more common. Which bits are
the "high" bits depends on endianness. */
for (ireg = 0; ireg < 32; ireg++)
- if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (ireg & 1))
+ if (used_math & USED_FR1)
+ {
+ trad_frame_set_reg_addr (this_cache,
+ ireg + regs->fp0,
+ (sigcontext_base + SIGCONTEXT_FPREGS
+ + ireg * SIGCONTEXT_REG_SIZE));
+ trad_frame_set_reg_addr (this_cache,
+ ireg + regs->fp0 + gdbarch_num_regs (gdbarch),
+ (sigcontext_base + SIGCONTEXT_FPREGS
+ + ireg * SIGCONTEXT_REG_SIZE));
+ }
+ else if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (ireg & 1))
trad_frame_set_reg_addr (this_cache,
ireg + regs->fp0 + gdbarch_num_regs (gdbarch),
(sigcontext_base + SIGCONTEXT_FPREGS + 4
--
1.9-rc2