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* [binutils-gdb] gdb/csky add unwinder for sigtramp frame when kernel 4.x and later
@ 2022-08-15 2:42 Jiangshuai Li
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From: Jiangshuai Li @ 2022-08-15 2:42 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=105afa7f230e5fed8f5a2eb28bc14d7696f5ac72
commit 105afa7f230e5fed8f5a2eb28bc14d7696f5ac72
Author: Jiangshuai Li <jiangshuai_li@linux.alibaba.com>
Date: Mon Aug 15 10:40:29 2022 +0800
gdb/csky add unwinder for sigtramp frame when kernel 4.x and later
When kernel veriosn >= V4.x, the characteristic values used to
determine whether it is a signal function call are:
movi r7, 139
trap 0
Registers are saved at (sp + CSKY_SIGINFO_OFFSET + CSKY_SIGINFO_SIZE
+ CSKY_UCONTEXT_SIGCONTEXT + CSKY_SIGCONTEXT_PT_REGS_TLS). The order
is described in csky_linux_rt_sigreturn_init_pt_regs.
Diff:
---
gdb/csky-linux-tdep.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
gdb/csky-tdep.h | 6 ++++++
2 files changed, 53 insertions(+)
diff --git a/gdb/csky-linux-tdep.c b/gdb/csky-linux-tdep.c
index ae5d2bba33c..7bcc1712180 100644
--- a/gdb/csky-linux-tdep.c
+++ b/gdb/csky-linux-tdep.c
@@ -353,6 +353,51 @@ csky_linux_rt_sigreturn_tramp_frame = {
csky_linux_rt_sigreturn_init
};
+static void
+csky_linux_rt_sigreturn_init_pt_regs (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
+{
+ int i;
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, CSKY_SP_REGNUM);
+
+ CORE_ADDR base = sp + CSKY_SIGINFO_OFFSET + CSKY_SIGINFO_SIZE
+ + CSKY_UCONTEXT_SIGCONTEXT
+ + CSKY_SIGCONTEXT_PT_REGS_TLS;
+
+ /* LR */
+ trad_frame_set_reg_addr (this_cache, CSKY_R15_REGNUM, base);
+
+ /* PC */
+ trad_frame_set_reg_addr (this_cache, CSKY_PC_REGNUM, base + 4);
+
+ /* PSR */
+ trad_frame_set_reg_addr (this_cache, CSKY_CR0_REGNUM, base + 8);
+
+ /* SP */
+ trad_frame_set_reg_addr (this_cache, CSKY_SP_REGNUM, base + 12);
+
+ /* Set addrs of R0 ~ R13. */
+ for (i = 0; i < 14; i++)
+ trad_frame_set_reg_addr (this_cache, i, base + i * 4 + 20);
+
+ trad_frame_set_id (this_cache, frame_id_build (sp, func));
+}
+
+
+static struct tramp_frame
+csky_linux_rt_sigreturn_tramp_frame_kernel_4x = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { CSKY_MOVI_R7_139, ULONGEST_MAX },
+ { CSKY_TRAP_0, ULONGEST_MAX },
+ { TRAMP_SENTINEL_INSN }
+ },
+ csky_linux_rt_sigreturn_init_pt_regs
+};
+
/* Hook function for gdbarch_register_osabi. */
static void
@@ -378,6 +423,8 @@ csky_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
tramp_frame_prepend_unwinder (gdbarch,
&csky_linux_rt_sigreturn_tramp_frame);
+ tramp_frame_prepend_unwinder (gdbarch,
+ &csky_linux_rt_sigreturn_tramp_frame_kernel_4x);
}
void _initialize_csky_linux_tdep ();
diff --git a/gdb/csky-tdep.h b/gdb/csky-tdep.h
index 3ee50fc5931..f845b9ab744 100644
--- a/gdb/csky-tdep.h
+++ b/gdb/csky-tdep.h
@@ -379,4 +379,10 @@ enum csky_regnum
#define CSKY_MOVI_R7_173 0x00adea07
#define CSKY_TRAP_0 0x2020c000
+/* Sizeof (tls) */
+#define CSKY_SIGCONTEXT_PT_REGS_TLS 4
+
+/* Macro for kernel 4.x */
+#define CSKY_MOVI_R7_139 0x008bea07
+
#endif
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