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From: Jiangshuai Li <jiangshuaili@sourceware.org> To: gdb-cvs@sourceware.org Subject: [binutils-gdb] gdb/csky add unwinder for long branch cases Date: Tue, 13 Sep 2022 06:20:14 +0000 (GMT) [thread overview] Message-ID: <20220913062014.9622638582B3@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d354e0c8e7d333d2ec1796f8ce4216e892a4c714 commit d354e0c8e7d333d2ec1796f8ce4216e892a4c714 Author: Jiangshuai Li <jiangshuai_li@linux.alibaba.com> Date: Tue Sep 13 14:19:26 2022 +0800 gdb/csky add unwinder for long branch cases There are two sequences of instructions for long branch: 1. jmpi [pc+4] //insn code: 0xeac00001 .long addr 2. lrw t1, [pc+8] //insn code: 0xea8d0002 jmp t1 //insn code: 0x7834 nop //insn code: 0x6c03 .long addr Diff: --- gdb/csky-tdep.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++----- gdb/csky-tdep.h | 5 +++++ 2 files changed, 60 insertions(+), 5 deletions(-) diff --git a/gdb/csky-tdep.c b/gdb/csky-tdep.c index ba53c1b10ca..3cd7a775f8d 100644 --- a/gdb/csky-tdep.c +++ b/gdb/csky-tdep.c @@ -2358,21 +2358,71 @@ static const struct frame_unwind csky_unwind_cache = { NULL }; +static CORE_ADDR +csky_check_long_branch (struct frame_info *frame, CORE_ADDR pc) +{ + gdb_byte buf[8]; + struct gdbarch *gdbarch = get_frame_arch (frame); + enum bfd_endian byte_order_for_code + = gdbarch_byte_order_for_code (gdbarch); + + if (target_read_memory (pc, buf, 8) == 0) + { + unsigned int data0 + = extract_unsigned_integer (buf, 4, byte_order_for_code); + unsigned int data1 + = extract_unsigned_integer (buf + 4, 4, byte_order_for_code); + + /* Case: jmpi [pc+4] : 0xeac00001 + .long addr */ + if (data0 == CSKY_JMPI_PC_4) + return data1; + + /* Case: lrw t1, [pc+8] : 0xea8d0002 + jmp t1 : 0x7834 + nop : 0x6c03 + .long addr */ + if ((data0 == CSKY_LRW_T1_PC_8) && (data1 == CSKY_JMP_T1_VS_NOP)) + { + if (target_read_memory (pc + 8, buf, 4) == 0) + return extract_unsigned_integer (buf, 4, byte_order_for_code); + } + return 0; + } + + return 0; +} static int csky_stub_unwind_sniffer (const struct frame_unwind *self, - struct frame_info *this_frame, - void **this_prologue_cache) + struct frame_info *this_frame, + void **this_prologue_cache) { - CORE_ADDR addr_in_block; + CORE_ADDR addr_in_block, pc; + gdb_byte dummy[4]; + const char *name; + CORE_ADDR start_addr; + /* Get pc */ addr_in_block = get_frame_address_in_block (this_frame); + pc = get_frame_pc (this_frame); - if (find_pc_partial_function (addr_in_block, NULL, NULL, NULL) == 0 - || in_plt_section (addr_in_block)) + if (in_plt_section (addr_in_block) + || target_read_memory (pc, dummy, 4) != 0) return 1; + /* Find the starting address and name of the function containing the PC. */ + if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) + { + start_addr = csky_check_long_branch (this_frame, pc); + /* if not long branch, return 0. */ + if (start_addr != 0) + return 1; + + return 0; + } + return 0; } diff --git a/gdb/csky-tdep.h b/gdb/csky-tdep.h index f845b9ab744..dbdcd15b3a7 100644 --- a/gdb/csky-tdep.h +++ b/gdb/csky-tdep.h @@ -385,4 +385,9 @@ enum csky_regnum /* Macro for kernel 4.x */ #define CSKY_MOVI_R7_139 0x008bea07 +/* Macro for check long branch. */ +#define CSKY_JMPI_PC_4 0x1eac0 +#define CSKY_LRW_T1_PC_8 0x2ea8d +#define CSKY_JMP_T1_VS_NOP 0x6c037834 + #endif
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