From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7882) id 1298D3858D32; Mon, 15 Aug 2022 02:42:36 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1298D3858D32 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable From: Jiangshuai Li To: gdb-cvs@sourceware.org Subject: [binutils-gdb] gdb/csky add unwinder for sigtramp frame when kernel 4.x and later X-Act-Checkin: binutils-gdb X-Git-Author: Jiangshuai Li X-Git-Refname: refs/heads/master X-Git-Oldrev: a9c09a3667cce34a9b5f7f0983254cc66a90e145 X-Git-Newrev: 105afa7f230e5fed8f5a2eb28bc14d7696f5ac72 Message-Id: <20220815024236.1298D3858D32@sourceware.org> Date: Mon, 15 Aug 2022 02:42:36 +0000 (GMT) X-BeenThere: gdb-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Aug 2022 02:42:36 -0000 https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D105afa7f230e= 5fed8f5a2eb28bc14d7696f5ac72 commit 105afa7f230e5fed8f5a2eb28bc14d7696f5ac72 Author: Jiangshuai Li Date: Mon Aug 15 10:40:29 2022 +0800 gdb/csky add unwinder for sigtramp frame when kernel 4.x and later =20 When kernel veriosn >=3D V4.x, the characteristic values used to determine whether it is a signal function call are: movi r7, 139 trap 0 =20 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 =3D { csky_linux_rt_sigreturn_init }; =20 +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 =3D get_frame_register_unsigned (this_frame, CSKY_SP_REGNUM= ); + + CORE_ADDR base =3D 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 =3D 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 =3D { + 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. */ =20 static void @@ -378,6 +423,8 @@ csky_linux_init_abi (struct gdbarch_info info, struct g= dbarch *gdbarch) =20 tramp_frame_prepend_unwinder (gdbarch, &csky_linux_rt_sigreturn_tramp_frame); + tramp_frame_prepend_unwinder (gdbarch, + &csky_linux_rt_sigreturn_tramp_frame_kernel_4x); } =20 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 =20 +/* Sizeof (tls) */ +#define CSKY_SIGCONTEXT_PT_REGS_TLS 4 + +/* Macro for kernel 4.x */ +#define CSKY_MOVI_R7_139 0x008bea07 + #endif