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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/04/29 16:31:11 UTC
[GitHub] [incubator-nuttx] btashton commented on a change in pull request #904: Resolve linking issues with x86_64 port
btashton commented on a change in pull request #904:
URL: https://github.com/apache/incubator-nuttx/pull/904#discussion_r417450328
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File path: arch/x86_64/src/intel64/intel64_lowsetup.c
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@@ -64,16 +77,16 @@ void up_lowsetup(void)
/* Setup pointers for accessing Page table and GDT in high address */
- pdpt = &pdpt_low + X86_64_LOAD_OFFSET;
- pd = &pd_low + X86_64_LOAD_OFFSET;
- pt = &pt_low + X86_64_LOAD_OFFSET;
+ pdpt = (uint64_t *)((uint64_t)&pdpt_low + X86_64_LOAD_OFFSET);
+ pd = (uint64_t *)((uint64_t)&pd_low + X86_64_LOAD_OFFSET);
+ pt = (uint64_t *)((uint64_t)&pt_low + X86_64_LOAD_OFFSET);
- ist64 = (struct ist_s *)((void *)&ist64_low + X86_64_LOAD_OFFSET);
- gdt64 = (struct gdt_entry_s *)((void *)&gdt64_low + X86_64_LOAD_OFFSET);
+ ist64 = (struct ist_s *)((uint64_t)&ist64_low + X86_64_LOAD_OFFSET);
+ gdt64 = (struct gdt_entry_s *)((uint64_t)&gdt64_low + X86_64_LOAD_OFFSET);
Review comment:
The compiler complains about aliasing, biggest issue here is that you need to cast to not the pointer type first otherwise if thinks if is uint8[] which overflows.
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