Try the attached patch instead. Pete On Tue, 2005-07-19 at 22:49 +0530, Kishore K wrote: > On 7/19/05, Ralf Baechle <ralf@xxxxxxxxxxxxxx> wrote: > > On Tue, Jul 19, 2005 at 10:00:20PM +0530, Kishore K wrote: > > > > > We are facing a problem when U-boot is compiled with gcc 3.x > > > > > > U-boot uses the following instruction in one of the files. > > > > > > bal jump_to_symbol > > > > > > This code gets compiled without any problem with gcc2. However, if I > > > compile the code > > > with gcc3, it exits with the error "Cannot branch to unknown symbol". > > > > > > What should we do to circumvent this problem ? > > > > > > I replaced > > > > > > bal jump_to_symbol > > > > > > by > > > > > > la t9, jump_to_symbol > > > jalr t9 > > > > > > Then code gets compiled properly without any problem. Please let me > > > know, whether this > > > is correct way of fixing the problem. I am newbie to MIPS assembly > > > language. Why this > > > change is required with gcc 3.x compiler ? > > > > FIrst of all, gcc doesn't care at all about your assembler code, that's > > the assembler which you must have changed along with that. > > > > There used to be no relocation type to represent a branch to an external > > symbol in an ELF file which is why gas is throwing an error message, so > > gas is throwing an error message. Latest gas fixed that shortcoming. > > I think there was a bug in somewhat older gas which resulted in such > > invalid code actually being accepted even though it shouldn't have been. > > > > Ralf > > Thank you very much for the reply. > > First of all code got compiled only after removing the option > -mips-allow-branch-to-undefined from Makefile. If this option is > included, compilation fails saying that option is invalid. I am using > binutils-2.14.90.06. > Same problem is observed even with binutils 2.15.94.0.2.2. > > Do you mean to say that no change is required in the code snippet > > bal jump_to_symbol > > and code should get compiled with the latest assembler without any > problem. Please clearify. > > TIA, > --kishore >
--- start.S 2004-02-06 17:27:17.000000000 -0800 +++ start.S~jalr 2005-01-29 16:13:18.000000000 -0800 @@ -234,21 +234,35 @@ li t0, CONF_CM_UNCACHED mtc0 t0, CP0_CONFIG + /* Initialize GOT pointer. + */ + bal 1f + nop + .word _GLOBAL_OFFSET_TABLE_ - 1f + 4 +1: + move gp, ra + lw t1, 0(ra) + add gp, t1 + + #ifdef CONFIG_INCA_IP /* Disable INCA-IP Watchdog. */ - bal disable_incaip_wdt + la t9, disable_incaip_wdt + jalr t9 nop #endif /* Initialize any external memory. */ - bal memsetup + la t9, memsetup + jalr t9 nop /* Initialize caches... */ - bal mips_cache_reset + la t9, mips_cache_reset + jalr t9 nop /* ... and enable them. @@ -260,21 +274,13 @@ /* Set up temporary stack. */ li a0, CFG_INIT_SP_OFFSET - bal mips_cache_lock + la t9, mips_cache_lock + jalr t9 nop li t0, CFG_SDRAM_BASE + CFG_INIT_SP_OFFSET la sp, 0(t0) - /* Initialize GOT pointer. - */ - bal 1f - nop - .word _GLOBAL_OFFSET_TABLE_ - 1f + 4 -1: - move gp, ra - lw t1, 0(ra) - add gp, t1 la t9, board_init_f j t9 nop
