diff options
Diffstat (limited to 'libgloss/mips/crt0.S')
| -rw-r--r-- | libgloss/mips/crt0.S | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/libgloss/mips/crt0.S b/libgloss/mips/crt0.S index 8bd46ebf0..1cc430402 100644 --- a/libgloss/mips/crt0.S +++ b/libgloss/mips/crt0.S @@ -54,11 +54,13 @@ */ nop + .globl hardware_hazard_hook .text .globl _start .ent _start _start: .set noreorder #ifdef __mips_embedded_pic +#define PICBASE start_PICBASE PICBASE = .+8 bal PICBASE nop @@ -75,6 +77,14 @@ _start: mtc0 zero, C0_CAUSE nop + /* Avoid hazard from FPU enable and other SR changes. */ + LA (t0, hardware_hazard_hook) + beq t0,zero,1f + nop + jal t0 + nop +1: + /* Check for FPU presence. Don't check if we know that soft_float is being used. (This also avoids illegal instruction exceptions.) */ @@ -97,6 +107,12 @@ _start: li v0, (STATUS_MASK-(STATUS_MASK & SR_CU1)) mtc0 v0, C0_SR nop + /* Avoid hazard from FPU disable. */ + LA (t0, hardware_hazard_hook) + beq t0,zero,2f + nop + jal t0 + nop 2: @@ -205,6 +221,11 @@ init: # destructors move a0,v0 # pass through the exit code .end init + +/* Assume the PICBASE set up above is no longer valid below here. */ +#ifdef __mips_embedded_pic +#undef PICBASE +#endif /* * _exit -- Exit from the application. Normally we cause a user trap @@ -214,14 +235,32 @@ init: * executables that contain a complete world to be linked with * just the crt0.o object. */ + .globl hardware_exit_hook .text .globl _exit .ent _exit _exit: 7: +#ifdef __mips_embedded_pic + /* Need to reinit PICBASE, since we might be called via exit() + rather than via a return path which would restore old s0. */ +#define PICBASE exit_PICBASE + PICBASE = .+8 + bal PICBASE + nop + move s0,$31 +#endif #ifdef GCRT0 - jal _mcleanup + LA (t0, _mcleanup) + jal t0 nop #endif + LA (t0, hardware_exit_hook) + beq t0,zero,1f + nop + jal t0 + nop +1: + # break instruction can cope with 0xfffff, but GAS limits the range: break 1023 nop @@ -229,4 +268,9 @@ _exit: nop .end _exit +/* Assume the PICBASE set up above is no longer valid below here. */ +#ifdef __mips_embedded_pic +#undef PICBASE +#endif + /* EOF crt0.S */ |