General: add tiny utilities to ease reading / debugging asm listings

713b89ee · Christos Gentsos · 8d9f057a · 713b89ee · 713b89ee
Commit 713b89ee authored Sep 12, 2019 by Christos Gentsos
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asm_find_func.sh utils/asm_find_func.sh +13 -0

asm_find_val.sh utils/asm_find_val.sh +10 -0

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--- a/utils/asm_find_func.sh
+++ b/utils/asm_find_func.sh
+#!/usr/bin/bash
+
+# The purpose of the script is to track down what function the assembly code calls.
+# for example, for the call in the two lines below:
+#    211a:	4b05      	ldr	r3, [pc, #20]	; (2130 <io_write+0x34>)
+#    211c:	4798      	blx	r3
+# the user would have to run `asm_find_func.sh listing_file.lss 2130` and they
+# would learn that the function called here is "assert".
+
+num=$(grep $2: "$1" | cut -f2)
+numhex=0x$(echo "ibase=16; obase=10; ${num^^}-1" | bc)
+numhexwide=$(printf '%08x\n' $numhex)
+grep $numhexwide "$1"
--- a/utils/asm_find_val.sh
+++ b/utils/asm_find_val.sh
+#!/usr/bin/bash
+
+# The purpose of the script is to track down the value of a variable accessed
+# in an assembly listing. for example, for the call in the line below:
+#    61de:	4b25      	ldr	r3, [pc, #148]	; (6274 <float_to_linear+0xa8>)
+# the user would have to run `asm_find_val.sh listing_file.lss 6274`
+# to learn the value loaded to r3.
+
+num=$(grep $2: "$1" | cut -f2)
+printf '%08x\n' 0x$num