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doc: sframe: Clarify FDE/FRE function/range start address fields

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The function start address in a SFrame FDE (sfde_func_start_address)
is encoded as a signed offset to the function start address from the
SFrame section.

The PC range start address in a SFrame FRE (sfre_start_address) is
encoded as an unsigned offset to the range from the function start
address.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
This commit is contained in:
Jens Remus
2025-02-04 15:13:24 +01:00
parent 49da9e9d9e
commit 45576ca2a8
1 changed files with 6 additions and 4 deletions
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10
libsframe/doc/sframe-spec.texi
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@@ -459,7 +459,9 @@ Following table describes each component of the SFrame FDE structure:
@tab @code{int32_t} @tab @code{int32_t}
@tab @code{sfde_func_start_address} @tab @code{sfde_func_start_address}
@tab Signed 32-bit integral field denoting the virtual memory address of the @tab Signed 32-bit integral field denoting the virtual memory address of the
described function. described function, for which the SFrame FDE applies. The value encoded in
the @code{sfde_func_start_address} field is the offset in bytes of the
function's start address, from the SFrame section.
@item 0x04 @item 0x04
@tab @code{uint32_t} @tab @code{uint32_t}
@@ -684,10 +686,10 @@ serializing and deserializing entities, if unaligned accesses need to be
avoided. avoided.
@code{sfre_start_address} is an unsigned 8-bit/16-bit/32-bit integral field @code{sfre_start_address} is an unsigned 8-bit/16-bit/32-bit integral field
identifies the start address of the range of program counters, for which the denoting the start address of a range of program counters, for which the
SFrame FRE applies. The value encoded in the @code{sfre_start_address} field SFrame FRE applies. The value encoded in the @code{sfre_start_address} field
is the offset in bytes of the start address of the SFrame FRE, from the start is the offset in bytes of the range's start address, from the start address
address of the function. of the function.
Further SFrame FRE types may be added in future. Further SFrame FRE types may be added in future.