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18a8f69ad8
We have a lot of examples that use jiffies, but they stopped working
long ago on x86-64 (since Linux kernel commit d8ad6d39c35d ("x86_64: Fix
jiffies ODR violation") (in v5.8 and backported to stable releases)) and
never worked on other architectures. This is because jiffies is defined
in the Linux kernel's linker script. #277 proposed updating the examples
to use jiffies_64, but I would guess that most kernel developers are
familiar with jiffies and many have never seen jiffies_64. jiffies is
also a nicer name to type in live demos. Let's add a case to the Linux
kernel object finder to get the jiffies variable.
Reported-by: Martin Liska <mliska@suse.cz>
Signed-off-by: Omar Sandoval <osandov@osandov.com>
40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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struct drgn_error *linux_kernel_object_find(const char *name, size_t name_len,
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const char *filename,
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enum drgn_find_object_flags flags,
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void *arg, struct drgn_object *ret)
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{
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struct drgn_program *prog = arg;
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if (!filename) {
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@memswitch (name, name_len)@
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@case "PAGE_SHIFT"@
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if (flags & DRGN_FIND_OBJECT_CONSTANT)
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return linux_kernel_get_page_shift(prog, ret);
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break;
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@case "PAGE_SIZE"@
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if (flags & DRGN_FIND_OBJECT_CONSTANT)
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return linux_kernel_get_page_size(prog, ret);
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break;
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@case "PAGE_MASK"@
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if (flags & DRGN_FIND_OBJECT_CONSTANT)
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return linux_kernel_get_page_mask(prog, ret);
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break;
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@case "UTS_RELEASE"@
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if (flags & DRGN_FIND_OBJECT_CONSTANT)
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return linux_kernel_get_uts_release(prog, ret);
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break;
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@case "jiffies"@
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if (flags & DRGN_FIND_OBJECT_VARIABLE)
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return linux_kernel_get_jiffies(prog, ret);
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break;
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@case "vmemmap"@
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if (flags & DRGN_FIND_OBJECT_CONSTANT)
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return linux_kernel_get_vmemmap(prog, ret);
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break;
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@endswitch@
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}
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return &drgn_not_found;
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}
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