Add backwards memory examination for the dereference command #942
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Grazfather
reviewed
Apr 4, 2023
gef.py
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| to_insnum = self.repeat_count * nb - 1 | ||
| insnum_step = -1 | ||
| else: | ||
| from_insnum = 0 + self.repeat_count * nb |
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The previous implementation had them, so I simply left them in place. I can't tell why they were placed, so I just left them there in case there's some obsure edge-case that I'm not aware of.
gef.py
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| if nb > 0: | ||
| from_insnum = nb * (self.repeat_count + 1) - 1 | ||
| to_insnum = self.repeat_count * nb - 1 | ||
| insnum_step = -1 |
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we don't have to repeat this line in both cases
gef.py
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| if nb > 0: | ||
| from_insnum = 0 + self.repeat_count * nb | ||
| to_insnum = nb * (self.repeat_count + 1) | ||
| insnum_step = 1 |
There was a problem hiding this comment.
we don't have to repeat this in both cases
gef.py
Outdated
| to_insnum = nb * (self.repeat_count + 1) | ||
| insnum_step = 1 | ||
| if nb > 0: | ||
| from_insnum = 0 + self.repeat_count * nb |
hugsy
requested changes
Apr 4, 2023
Grazfather
reviewed
Apr 4, 2023
tests/commands/dereference.py
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| "set {char[9]} ($sp+0x8) = { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x00 }", | ||
| "set {char[9]} ($sp-0x8) = { 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x00 }" | ||
| ] | ||
| res = gdb_start_silent_cmd(cmd=setup, after=cmd) | ||
| self.assertNoException(res) | ||
| print(res) |
tests/commands/dereference.py
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| "set {char[9]} ($sp+0x8) = { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x00 }", | ||
| "set {char[9]} ($sp-0x8) = { 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x00 }" | ||
| ] | ||
| res = gdb_start_silent_cmd(cmd=setup, after=cmd) | ||
| self.assertNoException(res) | ||
| print(res) |
gef.py
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| to_insnum = nb * (self.repeat_count + 1) | ||
| else: | ||
| from_insnum = nb * (self.repeat_count + 1) + 1 | ||
| to_insnum = (0 + self.repeat_count * nb) + 1 |
tests/commands/dereference.py
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| """ | ||
| res = res.splitlines()[-2] | ||
| self.assertTrue("AAAAAAAA" not in res) | ||
| self.assertTrue("BBBBBBBB" in res) |
tests/commands/dereference.py
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| Hence, we want to look at the second last line of the output | ||
| """ | ||
| res = res.splitlines()[-1] | ||
| self.assertTrue("AAAAAAAA" in res) |
tests/commands/dereference.py
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| """ | ||
| res = res.splitlines()[-1] | ||
| self.assertTrue("AAAAAAAA" in res) | ||
| self.assertTrue("BBBBBBBB" not in res) |
Grazfather
approved these changes
Apr 4, 2023
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Description/Motivation/Screenshots
This commit extends the
dereferencecommand, allowing to examine memory backwards via a negative--lengthvalue, analogous to the behaviour ofx.Against which architecture was this tested ?
"Tested" indicates that the PR works and the unit test (see
docs/testing.md) run passes without issue.Checklist
devbranch, notmain.