diff options
Diffstat (limited to 'arch/sparc/cpu/leon2')
-rw-r--r-- | arch/sparc/cpu/leon2/start.S | 60 |
1 files changed, 41 insertions, 19 deletions
diff --git a/arch/sparc/cpu/leon2/start.S b/arch/sparc/cpu/leon2/start.S index e43097c..974de76 100644 --- a/arch/sparc/cpu/leon2/start.S +++ b/arch/sparc/cpu/leon2/start.S @@ -57,6 +57,27 @@ MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4) #error Must define number of SPARC register windows, default is 8 #endif +/* Macros to load address into a register. Uses GOT table for PIC */ +#ifdef __PIC__ + +#define SPARC_PIC_THUNK_CALL(reg) \ + sethi %pc22(_GLOBAL_OFFSET_TABLE_-4), %##reg; \ + call __sparc_get_pc_thunk.reg; \ + add %##reg, %pc10(_GLOBAL_OFFSET_TABLE_+4), %##reg; + +#define SPARC_LOAD_ADDRESS(sym, got, reg) \ + sethi %gdop_hix22(sym), %##reg; \ + xor %##reg, %gdop_lox10(sym), %##reg; \ + ld [%##got + %##reg], %##reg, %gdop(sym); + +#else + +#define SPARC_PIC_THUNK_CALL(reg) +#define SPARC_LOAD_ADDRESS(sym, got, tmp) \ + set sym, %##reg; + +#endif + #define STACK_ALIGN 8 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1)) @@ -278,7 +299,7 @@ leon2_init_mctrl: srl %g2, 30, %g2 andcc %g2, 3, %g6 bne,a leon2_init_wim - mov %g0, %asr16 ! clear err_reg + mov %g0, %asr16 ! clear err_reg leon2_init_wim: set WIM_INIT, %g3 @@ -299,7 +320,7 @@ leon2_init_stackp: cpu_init_unreloc: call cpu_init_f - nop + nop /* un relocated start address of monitor */ #define TEXT_START _text @@ -307,9 +328,10 @@ cpu_init_unreloc: /* un relocated end address of monitor */ #define DATA_END __init_end + SPARC_PIC_THUNK_CALL(l7) reloc: - set TEXT_START,%g2 - set DATA_END,%g3 + SPARC_LOAD_ADDRESS(TEXT_START, l7, g2) + SPARC_LOAD_ADDRESS(DATA_END, l7, g3) set CONFIG_SYS_RELOC_MONITOR_BASE,%g4 reloc_loop: ldd [%g2],%l0 @@ -319,7 +341,7 @@ reloc_loop: inc 16,%g2 subcc %g3,%g2,%g0 bne reloc_loop - inc 16,%g4 + inc 16,%g4 clr %l0 clr %l1 @@ -336,8 +358,8 @@ reloc_loop: clr_bss: /* clear bss area (the relocated) */ - set __bss_start,%g2 - set __bss_end,%g3 + SPARC_LOAD_ADDRESS(__bss_start, l7, g2) + SPARC_LOAD_ADDRESS(__bss_end, l7, g3) sub %g3,%g2,%g3 add %g3,%g4,%g3 clr %g1 /* std %g0 uses g0 and g1 */ @@ -348,19 +370,19 @@ clr_bss_16: inc 16,%g4 cmp %g3,%g4 bne clr_bss_16 - nop + nop /* add offsets to GOT table */ fixup_got: - set __got_start,%g4 - set __got_end,%g3 + SPARC_LOAD_ADDRESS(__got_start, l7, g4) + SPARC_LOAD_ADDRESS(__got_end, l7, g3) /* * new got offset = (old GOT-PTR (read with ld) - * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) + * Destination Address (from define) */ set CONFIG_SYS_RELOC_MONITOR_BASE,%g2 - set TEXT_START, %g1 + SPARC_LOAD_ADDRESS(TEXT_START, l7, g1) add %g4,%g2,%g4 sub %g4,%g1,%g4 add %g3,%g2,%g3 @@ -375,11 +397,11 @@ got_loop: inc 4,%g4 cmp %g3,%g4 bne got_loop - nop + nop prom_relocate: - set __prom_start, %g2 - set __prom_end, %g3 + SPARC_LOAD_ADDRESS(__prom_start, l7, g2) + SPARC_LOAD_ADDRESS(__prom_end, l7, g3) set CONFIG_SYS_PROM_OFFSET, %g4 prom_relocate_loop: @@ -390,7 +412,7 @@ prom_relocate_loop: inc 16,%g2 subcc %g3,%g2,%g0 bne prom_relocate_loop - inc 16,%g4 + inc 16,%g4 /* Trap table has been moved, lets tell CPU about * the new trap table address @@ -403,19 +425,19 @@ prom_relocate_loop: nop /* Call relocated init functions */ jump: - set cpu_init_f2,%o1 + SPARC_LOAD_ADDRESS(cpu_init_f2, l7, o1) set CONFIG_SYS_RELOC_MONITOR_BASE,%o2 add %o1,%o2,%o1 sub %o1,%g1,%o1 call %o1 - clr %o0 + clr %o0 - set board_init_f,%o1 + SPARC_LOAD_ADDRESS(board_init_f, l7, o1) set CONFIG_SYS_RELOC_MONITOR_BASE,%o2 add %o1,%o2,%o1 sub %o1,%g1,%o1 call %o1 - clr %o0 + clr %o0 dead: ta 0 ! if call returns... nop |