I'm trying to learn how debugger works. With the help of this
blog
https://eli.thegreenplace.net/2011/01/27/how-debuggers-work-part-2-breakpoints
I'm able to set breakpoint and continue.
In the next step of learning, I wanted to learn how to extract values of
variables.
But, the dwarf output says the frame base addrs as: 1 byte block: 9c
(DW_OP_call_frame_cfa)
<0><48a28>: Abbrev Number: 1 (DW_TAG_compile_unit)
<48a29> DW_AT_name : main
<48a2e> DW_AT_language : 22 (Go)
<48a2f> DW_AT_stmt_list : 0x26b2c
<48a33> DW_AT_low_pc : 0x498200
<48a3b> DW_AT_ranges : 0x28a70
<48a3f> DW_AT_comp_dir : .
<48a41> DW_AT_producer : Go cmd/compile go1.16.6; -N -l
<48a60> Unknown AT value: 2905: main
<1><48a65>: Abbrev Number: 3 (DW_TAG_subprogram)
<48a66> DW_AT_name : main.main
<48a70> DW_AT_low_pc : 0x498200
<48a78> DW_AT_high_pc : 0x4982e5
<48a80> DW_AT_frame_base : 1 byte block: 9c (DW_OP_call_frame_cfa)
<48a82> DW_AT_decl_file : 0x2
<48a86> DW_AT_external : 1
<2><48a87>: Abbrev Number: 21 (DW_TAG_lexical_block)
<48a88> DW_AT_low_pc : 0x498223
<48a90> DW_AT_high_pc : 0x4982d9
<3><48a98>: Abbrev Number: 10 (DW_TAG_variable)
<48a99> DW_AT_name : variableToTrace
<48aa9> DW_AT_decl_line : 11
<48aaa> DW_AT_type : <0x4ab9f>
<48aae> DW_AT_location : 3 byte block: 91 b0 7f (DW_OP_fbreg: -80)
I wanted to readt variableToTrace. to my understanding, I can read the
variable from CFA-80
But don't know how to calculate CFA.
Can anyone help me with this?
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