AuxXxilium/linux_dsm_epyc7002
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Revert "ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing"

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Blingly ignoring CIE.version != 1 was a bad idea.
It still leaves "desirability" when running perf with callgraphing where libgcc
symbols might show in hotspot.

More importantly, basic CIE.version == 3 support already exists in code:

|
|   retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end);
|

Next commit with simply add continue-not-bail for CIE.version != 1

This reverts commit 323f41f9e7.
This commit is contained in:
Vineet Gupta 2015-12-21 13:29:44 +05:30
parent 07fd7d4bbc
commit 2d64affc92
1 changed files with 4 additions and 9 deletions
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13
arch/arc/kernel/unwind.c
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@ -293,13 +293,13 @@ static void init_unwind_hdr(struct unwind_table *table,
const u32 *cie = cie_for_fde(fde, table);
signed ptrType;
if (cie == &not_fde) /* only process FDE here */
if (cie == &not_fde)
continue;
if (cie == NULL || cie == &bad_cie)
continue; /* say FDE->CIE.version != 1 */
return;
ptrType = fde_pointer_type(cie);
if (ptrType < 0)
continue;
return;
ptr = (const u8 *)(fde + 2);
if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde,
@ -343,10 +343,6 @@ static void init_unwind_hdr(struct unwind_table *table,
if (fde[1] == 0xffffffff)
continue; /* this is a CIE */
if (*(u8 *)(cie + 2) != 1)
continue; /* FDE->CIE.version not supported */
ptr = (const u8 *)(fde + 2);
header->table[n].start = read_pointer(&ptr,
(const u8 *)(fde + 1) +
@ -523,8 +519,7 @@ static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table)
if (*cie <= sizeof(*cie) + 4 || *cie >= fde[1] - sizeof(*fde)
|| (*cie & (sizeof(*cie) - 1))
|| (cie[1] != 0xffffffff)
|| ( *(u8 *)(cie + 2) != 1)) /* version 1 supported */
|| (cie[1] != 0xffffffff))
return NULL; /* this is not a (valid) CIE */
return cie;
}