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arm: warn/error on movrelx usage problematic with PIC on ELF 

The warning has false positives but our asm does not trigger it. For
new code false positives can only be avoided by changing the register
allocation.
This commit is contained in:
Janne Grunau 2016-11-18 21:06:40 +01:00
parent 5bcc6f76f1
commit 6a1ea4ec93
1 changed files with 9 additions and 0 deletions
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9
libavutil/arm/asm.S
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@ -184,6 +184,15 @@ T ldr \rd, [\rd]
.endm .endm
.macro movrelx rd, val, gp .macro movrelx rd, val, gp
.ifc \rd,\gp
.error "movrelx needs two distinct registers"
.endif
.ifc \rd\()_\gp,r12_
.warning "movrelx rd=\rd without explicit set gp"
.endif
.ifc \rd\()_\gp,ip_
.warning "movrelx rd=\rd without explicit set gp"
.endif
#if CONFIG_PIC && defined(__ELF__) #if CONFIG_PIC && defined(__ELF__)
.ifnb \gp .ifnb \gp
.if .Lpic_gp .if .Lpic_gp