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XScale: restore_context() cleanup 

Clean up two aspects to this routine:  bad naming, since it
doesn't restore the context, just the banked registers; and
excess indentation for the bulk of the code.

Also make some of its call sites stash the function's return
code; someday they should use it for error checking.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
David Brownell 2009-11-30 19:14:19 -08:00
parent da7c202b57
commit 892604bc7e
1 changed files with 30 additions and 38 deletions
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48
src/target/xscale.c
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@ -62,7 +62,7 @@
static int xscale_resume(struct target *, int current,
uint32_t address, int handle_breakpoints, int debug_execution);
static int xscale_debug_entry(struct target *);
static int xscale_restore_context(struct target *);
static int xscale_restore_banked(struct target *);
static int xscale_get_reg(struct reg *reg);
static int xscale_set_reg(struct reg *reg, uint8_t *buf);
static int xscale_set_breakpoint(struct target *, struct breakpoint *);
@ -1251,7 +1251,7 @@ static int xscale_resume(struct target *target, int current,
xscale_enable_single_step(target, next_pc);
/* restore banked registers */
xscale_restore_context(target);
retval = xscale_restore_banked(target);
/* send resume request (command 0x30 or 0x31)
* clean the trace buffer if it is to be enabled (0x62) */
@ -1296,7 +1296,7 @@ static int xscale_resume(struct target *target, int current,
xscale_enable_watchpoints(target);
/* restore banked registers */
xscale_restore_context(target);
retval = xscale_restore_banked(target);
/* send resume request (command 0x30 or 0x31)
* clean the trace buffer if it is to be enabled (0x62) */
@ -1371,7 +1371,7 @@ static int xscale_step_inner(struct target *target, int current,
return retval;
/* restore banked registers */
if ((retval = xscale_restore_context(target)) != ERROR_OK)
if ((retval = xscale_restore_banked(target)) != ERROR_OK)
return retval;
/* send resume request (command 0x30 or 0x31)
@ -1755,7 +1755,7 @@ static int xscale_full_context(struct target *target)
return ERROR_OK;
}
static int xscale_restore_context(struct target *target)
static int xscale_restore_banked(struct target *target)
{
struct arm *armv4_5 = target_to_armv4_5(target);
@ -1774,8 +1774,8 @@ static int xscale_restore_context(struct target *target)
*/
for (i = 1; i < 7; i++)
{
int dirty = 0;
enum armv4_5_mode mode = armv4_5_number_to_mode(i);
struct reg *r;
if (mode == ARMV4_5_MODE_USR)
continue;
@ -1785,7 +1785,7 @@ static int xscale_restore_context(struct target *target)
{
if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
mode, j).dirty)
dirty = 1;
goto dirty;
}
/* if not USR/SYS, check if the SPSR needs to be written */
@ -1793,45 +1793,37 @@ static int xscale_restore_context(struct target *target)
{
if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
mode, 16).dirty)
dirty = 1;
goto dirty;
}
/* is there anything to flush for this mode? */
if (dirty)
{
uint32_t tmp_cpsr;
struct reg *r;
/* there's nothing to flush for this mode */
continue;
dirty:
/* command 0x1: "send banked registers" */
xscale_send_u32(target, 0x1);
tmp_cpsr = 0x0;
tmp_cpsr |= mode;
tmp_cpsr |= 0xc0; /* I/F bits */
/* send CPSR for desired mode */
xscale_send_u32(target, tmp_cpsr);
xscale_send_u32(target, mode | 0xc0 /* I/F bits */);
/* send banked registers, r8 to r14, and spsr if not in USR/SYS mode */
for (j = 8; j <= 14; j++)
{
/* send r8 to r14/lr ... only FIQ needs more than r13..r14,
* but this protocol doesn't understand that nuance.
*/
for (j = 8; j <= 14; j++) {
r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
mode, j);
xscale_send_u32(target,
buf_get_u32(r->value, 0, 32));
xscale_send_u32(target, buf_get_u32(r->value, 0, 32));
r->dirty = false;
}
if (mode != ARMV4_5_MODE_SYS)
{
/* send spsr if not in USR/SYS mode */
if (mode != ARMV4_5_MODE_SYS) {
r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
mode, 16);
xscale_send_u32(target,
buf_get_u32(r->value, 0, 32));
xscale_send_u32(target, buf_get_u32(r->value, 0, 32));
r->dirty = false;
}
}
}
return ERROR_OK;
}