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https://github.com/netsurf-browser/netsurf
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RISC OS: fix awrender glue for EABI
The only hand-written asm is the glue to Artworks Render. Update it to be ABI compliant when building for EABI and force the alignment of the data in the .bss section (as unaligned rotated loads are really not a thing). No functional change for non-EABI builds but, as the stack framing differs depending on the ABI in use, we can no longer reliably use fp as the base pointer for on-stack function arguments to awrender_render. Thus, this has been reworked to use ip as the pointer instead and to also use r8/r9 to relieve excess register pressure.
This commit is contained in:
John-Mark Bell
parent
cd76c45e9e
commit
1577d00050
@ -209,12 +209,18 @@ errblk % 256
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@ os_error *awrender_init(byte **doc, size_t *doc_size, void *init_routine, void *init_workspace);
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.global awrender_init
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awrender_init: MOV ip,sp
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awrender_init:
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#ifndef __ARM_EABI__
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MOV ip,sp
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STMFD sp!,{a1,a2,v1,v2,fp,ip,lr,pc}
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SUB fp,ip,#4
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SUB ip,sp,#512
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CMP ip,sl
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BLMI __rt_stkovf_split_big
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#else
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STMFD sp!,{a1,a2,v1,v2,fp,lr}
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ADD fp,sp,#4*4
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#endif
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LDR v2,=aw_temp
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LDR a1,[a1]
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@ -235,14 +241,18 @@ awrender_init: MOV ip,sp
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@ return updated block ptr & size to caller
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LDR a2,[fp,#-28]
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LDR a3,[fp,#-24]
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LDR a2,[sp],#4
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LDR a3,[sp],#4
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LDR ip,[v2,#aw_rsz_block]
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LDR lr,[v2,#aw_rsz_size]
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STR ip,[a2]
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STR lr,[a3]
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LDMEA fp,{v1,v2,fp,sp,pc}
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#ifndef __ARM_EABI__
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LDMDB fp,{v1,v2,fp,sp,pc}
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#else
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LDMIA sp!,{v1,v2,fp,pc}
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#endif
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@ os_error *awrender_render(const char *doc,
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@ -258,37 +268,46 @@ awrender_init: MOV ip,sp
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@ void *workspace);
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.global awrender_render
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awrender_render: MOV ip,sp
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STMFD sp!,{v1-v4,fp,ip,lr,pc}
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awrender_render:
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#ifndef __ARM_EABI__
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MOV ip,sp
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STMFD sp!,{v1-v6,fp,ip,lr,pc}
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SUB fp,ip,#4
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SUB ip,sp,#512
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CMP ip,sl
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BLMI __rt_stkovf_split_big
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ADD ip,fp,#4 @ ip -> stacked args
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#else
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MOV ip,sp @ ip -> stacked args
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STMFD sp!,{v1-v6,fp,lr}
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ADD fp,sp,#6*4
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#endif
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LDR R12,[fp,#20]
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LDR R14,=aw_temp
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LDR R5,[fp,#4]
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LDR R6,[fp,#12]
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LDR R5,[ip,#0] @ rsz_block
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LDR R6,[ip,#8] @ wysiwyg_setting
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LDR R4,[R5] @ resizable block
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LDR R7,[fp,#16]
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LDR R7,[ip,#12] @ output_dest
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LDR R8,[ip,#16] @ doc_size
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LDR R9,[ip,#4] @ rsz_size
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STR R4,[R14,#aw_rsz_block]
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STR R0,[R14,#aw_fixed_block] @ document ptr
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STR R12,[R14,#aw_fixed_size] @ document size
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LDR R12,[fp,#8]
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STR R8,[R14,#aw_fixed_size] @ document size
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STR R5,[sp,#-4]! @ ptr to receive block
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STR R12,[sp,#-4]! @ ptr to receive size
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STR R9,[sp,#-4]! @ ptr to receive size
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LDR R12,[R12]
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LDR R9,[R9]
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ADR R5,aw_callback
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STR R12,[R14,#aw_rsz_size]
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STR R9,[R14,#aw_rsz_size]
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STR sl,[R14,#aw_sl]
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STR fp,[R14,#aw_fp]
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LDR R12,[fp,#28]
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LDR R8,[ip,#20] @ routine
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LDR R12,[ip,#24] @ workspace
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MOV lr,pc
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LDR pc,[fp,#24]
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MOV pc,R8
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MOVVC a1,#0
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@ return updated block ptr & size to caller
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@ -301,7 +320,11 @@ awrender_render: MOV ip,sp
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STR R5,[R12]
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STR R6,[R4]
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LDMEA fp,{v1-v4,fp,sp,pc}
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#ifndef __ARM_EABI__
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LDMDB fp,{v1-v6,fp,sp,pc}
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#else
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LDMIA sp!,{v1-v6,fp,pc}
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#endif
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@ Callback routine for block resizing
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@ -340,11 +363,18 @@ aw_callback: TEQ R11,#3
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CMP R1,R2
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BLS aw_read
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STMFD R13!,{R1,R10-R12,R14}
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STMFD R13!,{R1,R4,R10-R12,R14}
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#ifdef __ARM_EABI__
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MOV R4,R13 @ save original sp
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BIC R13,R13,#7 @ align to multiple of 8
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#endif
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LDR sl,[R11,#aw_sl]
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LDR fp,[R11,#aw_fp]
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BL realloc
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LDMFD R13!,{R1,R10-R12,R14}
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#ifdef __ARM_EABI__
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MOV R13,R4 @ restore unaligned sp
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#endif
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LDMFD R13!,{R1,R4,R10-R12,R14}
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CMP R0,#0 @ did it work?
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BEQ aw_nomem
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@ -359,7 +389,11 @@ aw_read: @ return details of fixed block
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SUBS R11,R11,R11 @ clear V
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MOV PC,R14
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aw_nomem: STMFD R13!,{R10,R12,R14}
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aw_nomem: STMFD R13!,{R4,R10,R12,R14}
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#ifdef __ARM_EABI__
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MOV R4,R13 @ save original sp
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BIC R13,R13,#7 @ align to multiple of 8
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#endif
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LDR sl,[R11,#aw_sl]
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LDR fp,[R11,#aw_fp]
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ADR R0,tok_nomem
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@ -370,13 +404,17 @@ aw_nomem: STMFD R13!,{R10,R12,R14}
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SUB R0,R0,#4 @ error number already 0
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MOV R11,#0 @ restore reason code
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CMP PC,#1<<31 @ set V
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LDMFD R13!,{R10,R12,PC}
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#ifdef __ARM_EABI__
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MOV R13,R4 @ restore original sp
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#endif
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LDMFD R13!,{R4,R10,R12,PC}
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tok_nomem: .asciz "NoMemory"
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.align
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.bss
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.align
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aw_temp: .space sizeof_aw
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.type aw_temp, %object
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.size aw_temp, . - aw_temp
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